转到网站首页
转为中文步骤：
1、请用电脑端360浏览器打开本页地址，如您电脑未安装360浏览器，请点这里下载;
2、点击360浏览器右上角的翻译插件，如右图红圈中所示:
3、点击所弹出窗口里的右下角的按钮 “翻译当前网页”;
4、弹窗提示翻译完毕后关闭弹窗即可；
Integrated Device Technology, Inc.  
Document Type: Data Sheet  
ICS1893BF  
Document Stage: Rev. F Release  
3.3-V 10Base-T/100Base-TX Integrated PHYceiver™  
General  
Features  
The ICS1893BF is a low-power, physical-layer device (PHY)  
that supports the ISO/IEC 10Base-T and 100Base-TX  
Carrier-Sense Multiple Access/Collision Detection  
(CSMA/CD) Ethernet standards, ISO/IEC 8802-3.  
• Supports category 5 cables with attenuation in excess of  
24dB at 100 MHz.  
• Single-chip, fully integrated PHY provides PCS, PMA, PMD,  
and AUTONEG sub layers functions of IEEE standard.  
The ICS1893BF is intended for MII, Node applications that  
require the Auto-MDIX feature that automatically corrects  
crossover errors in plant wiring.  
• 10Base-T and 100Base-TX IEEE 8802.3 compliant  
• Single 3.3V power supply  
The ICS1893BF incorporates Digital-Signal Processing (DSP)  
control in its Physical-Medium Dependent (PMD) sub layer. As  
a result, it can transmit and receive data on unshielded  
twisted-pair (UTP) category 5 cables with attenuation in  
excess of 24 dB at 100MHz. With this ICS-patented  
technology, the ICS1893BF can virtually eliminate errors from  
killer packets.  
• Highly configurable, supports:  
– Media Independent Interface (MII)  
– Auto-Negotiation with Parallel detection  
– Node applications, managed or unmanaged  
– 10M or 100M full and half-duplex modes  
– Loopback mode for Diagnostic Functions  
– Auto-MDI/MDIX crossover correction  
The ICS1893BF provides a Serial-Management Interface for  
exchanging command and status information with a  
Station-Management (STA) entity. The ICS1893BF  
Media-Dependent Interface (MDI) can be configured to  
provide either half- or full-duplex operation at data rates of 10  
Mb/s or 100Mb/s.  
• Low-power CMOS (typically 400 mW)  
• Power-Down mode typically 21mW  
• Clock and crystal supported  
• Fully integrated, DSP-based PMD includes:  
– Adaptive equalization and baseline-wander correction  
– Transmit wave shaping and stream cipher scrambler  
– MLT-3 encoder and NRZ/NRZI encoder  
The ICS1893BF is available in a 300-mil 48-lead SSOP  
package. The ICS1893BF shares the same proven  
performance circuitry with the ICS1893AF but is not a  
pin-for-pin replacement of the 1893AF. An application note for  
a dual footprint layout to accommodate ICS1893AF or  
ICS1893BF is available on the ICS website.  
• Small footprint 48-pin 300 mil. SSOP package  
• Also available in small footprint 56-pin 8x8 MLF2 package  
• Available in Industrial Temp  
Applications: NIC cards, PC motherboards, switches,  
routers, DSL and cable modems, game machines,  
printers.  
ICS1893BF Block Diagram  
100Base-T  
PCS  
PMA  
TP_PMD  
•
•
Framer  
CRS/COL  
Detection  
Parallel to Serial  
4B/5B  
•
•
•
•
Clock Recovery  
Link Monitor  
Signal Detection  
Error Detection  
•
•
•
•
MLT-3  
10/100 MII  
MAC  
Interface  
Twisted-  
Pair  
Interface to  
Magnetics  
Modulesand  
RJ45  
Interface  
MUX  
Integrated  
Switch  
Stream Cipher  
Adaptive Equalizer  
Baseline Wander  
Correction  
•
•
10Base-T  
Connector  
MII  
Low-Jitter  
Clock  
Synthesizer  
Auto-  
Negotiation  
Configuration  
and Status  
Extended  
Register  
Set  
MII  
Management  
Interface  
Clock  
Power  
LEDs and PHY  
Address  
IDT reserves the right to make changes in the device data identified in  
this publication without further notice. IDT advises its customers to  
obtain the latest version of all device data to verify that any information  
being relied upon by the customer is current and accurate.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
ICS1893BF Data Sheet - Release  
Table of Contents  
Table of Contents  
Section  
Title  
Page  
Chapter 1  
Chapter 2  
Abbreviations and Acronyms .........................................................................................10  
Conventions and Nomenclature.....................................................................................12  
Chapter 3  
3.1  
Overview of the ICS1893BF.............................................................................................14  
100Base-TX Operation ..........................................................................................15  
3.2  
10Base-T Operation ...............................................................................................15  
Chapter 4  
4.1  
Operating Modes Overview.............................................................................................16  
Reset Operations ...................................................................................................17  
4.1.1  
4.1.2  
4.2  
4.3  
4.4  
4.5  
4.6  
4.7  
4.8  
General Reset Operations .....................................................................................17  
Specific Reset Operations .....................................................................................18  
Power-Down Operations ........................................................................................19  
Automatic Power-Saving Operations .....................................................................20  
Auto-Negotiation Operations ..................................................................................20  
100Base-TX Operations ........................................................................................21  
10Base-T Operations .............................................................................................21  
Half-Duplex and Full-Duplex Operations ...............................................................21  
Auto-MDI/MDIX Crossover .....................................................................................22  
Chapter 5  
5.1  
Interface Overviews..........................................................................................................23  
MII Data Interface ..................................................................................................24  
5.2  
5.3  
5.3.1  
5.4  
5.5  
Serial Management Interface .................................................................................25  
Twisted-Pair Interface ............................................................................................25  
Twisted-Pair Transmitter.........................................................................................25  
Clock Reference Interface .....................................................................................27  
Status Interface ......................................................................................................29  
Chapter 6  
6.1  
Functional Blocks.............................................................................................................31  
Functional Block: Media Independent Interface .....................................................32  
6.2  
Functional Block: Auto-Negotiation ........................................................................33  
Auto-Negotiation General Process ........................................................................33  
Auto-Negotiation: Parallel Detection ......................................................................34  
Auto-Negotiation: Remote Fault Signaling .............................................................35  
Auto-Negotiation: Reset and Restart .....................................................................35  
Auto-Negotiation: Progress Monitor .......................................................................36  
6.2.1  
6.2.2  
6.2.3  
6.2.4  
6.2.5  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
2
ICS1893BF Data Sheet Rev. F - Release  
Table of Contents  
Table of Contents  
Section  
Title  
Page  
6.3  
Functional Block: 100Base-X PCS and PMA Sublayers ........................................36  
PCS Sublayer ........................................................................................................36  
PMA Sublayer ........................................................................................................36  
PCS/PMA Transmit Modules .................................................................................37  
PCS/PMA Receive Modules ..................................................................................37  
PCS Control Signal Generation .............................................................................38  
4B/5B Encoding/Decoding .....................................................................................39  
Functional Block: 100Base-TX TP-PMD Operations .............................................39  
100Base-TX Operation: Stream Cipher Scrambler/Descrambler ..........................39  
100Base-TX Operation: MLT-3 Encoder/Decoder .................................................40  
100Base-TX Operation: DC Restoration ................................................................40  
100Base-TX Operation: Adaptive Equalizer ..........................................................40  
100Base-TX Operation: Twisted-Pair Transmitter .................................................40  
100Base-TX Operation: Twisted-Pair Receiver .....................................................41  
100Base-TX Operation: Isolation Transformer ......................................................41  
Functional Block: 10Base-T Operations ................................................................41  
10Base-T Operation: Manchester Encoder/Decoder .............................................41  
10Base-T Operation: Clock Synthesis ...................................................................42  
10Base-T Operation: Clock Recovery ...................................................................42  
10Base-T Operation: Idle .......................................................................................42  
10Base-T Operation: Link Monitor .........................................................................42  
10Base-T Operation: Smart Squelch .....................................................................43  
10Base-T Operation: Carrier Detection .................................................................44  
10Base-T Operation: Collision Detection ...............................................................44  
10Base-T Operation: Jabber ..................................................................................44  
10Base-T Operation: SQE Test .............................................................................44  
10Base-T Operation: Twisted-Pair Transmitter .....................................................45  
10Base-T Operation: Twisted-Pair Receiver .........................................................45  
10Base-T Operation: Auto Polarity Correction .......................................................45  
10Base-T Operation: Isolation Transformer ...........................................................46  
Functional Block: Management Interface ...............................................................46  
Management Register Set Summary .....................................................................46  
Management Frame Structure ...............................................................................46  
6.3.1  
6.3.2  
6.3.3  
6.3.4  
6.3.5  
6.3.6  
6.4  
6.4.1  
6.4.2  
6.4.3  
6.4.4  
6.4.5  
6.4.6  
6.4.7  
6.5  
6.5.1  
6.5.2  
6.5.3  
6.5.4  
6.5.5  
6.5.6  
6.5.7  
6.5.8  
6.5.9  
6.5.10  
6.5.11  
6.5.12  
6.5.13  
6.5.14  
6.6  
6.6.1  
6.6.2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
3
ICS1893BF Data Sheet - Release  
Table of Contents  
Table of Contents  
Section  
Title  
Page  
Chapter 7  
7.1  
Management Register Set ...............................................................................................49  
Introduction to Management Register Set .............................................................50  
7.1.1  
7.1.2  
7.1.3  
7.1.4  
Management Register Set Outline .........................................................................50  
Management Register Bit Access ..........................................................................51  
Management Register Bit Default Values ..............................................................51  
Management Register Bit Special Functions .........................................................52  
7.2  
Register 0: Control Register ...................................................................................53  
Reset (bit 0.15) ......................................................................................................53  
Loopback Enable (bit 0.14) ....................................................................................54  
Data Rate Select (bit 0.13) .....................................................................................54  
Auto-Negotiation Enable (bit 0.12) .........................................................................54  
Low Power Mode (bit 0.11) ....................................................................................55  
Isolate (bit 0.10) .....................................................................................................55  
Restart Auto-Negotiation (bit 0.9) ..........................................................................55  
Duplex Mode (bit 0.8) .............................................................................................56  
Collision Test (bit 0.7) ............................................................................................56  
IEEE Reserved Bits (bits 0.6:0) .............................................................................56  
7.2.1  
7.2.2  
7.2.3  
7.2.4  
7.2.5  
7.2.6  
7.2.7  
7.2.8  
7.2.9  
7.2.10  
7.3  
Register 1: Status Register ....................................................................................57  
100Base-T4 (bit 1.15) ............................................................................................57  
100Base-TX Full Duplex (bit 1.14) .........................................................................58  
100Base-TX Half Duplex (bit 1.13) ........................................................................58  
10Base-T Full Duplex (bit 1.12) .............................................................................58  
10Base-T Half Duplex (bit 1.11) ............................................................................ 58  
IEEE Reserved Bits (bits 1.10:7) ...........................................................................59  
MF Preamble Suppression (bit 1.6) .......................................................................59  
Auto-Negotiation Complete (bit 1.5) .......................................................................59  
Remote Fault (bit 1.4) ............................................................................................60  
Auto-Negotiation Ability (bit 1.3) ............................................................................60  
Link Status (bit 1.2) ................................................................................................60  
Jabber Detect (bit 1.1) ...........................................................................................61  
Extended Capability (bit 1.0) ..................................................................................61  
7.3.1  
7.3.2  
7.3.3  
7.3.4  
7.3.5  
7.3.6  
7.3.7  
7.3.8  
7.3.9  
7.3.10  
7.3.11  
7.3.12  
7.3.13  
7.4  
Register 2: PHY Identifier Register ........................................................................62  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
4
ICS1893BF Data Sheet Rev. F - Release  
Table of Contents  
Table of Contents  
Section  
Title  
Page  
7.5  
Register 3: PHY Identifier Register ........................................................................63  
OUI bits 19-24 (bits 3.15:10) ..................................................................................63  
Manufacturer's Model Number (bits 3.9:4) .............................................................63  
Revision Number (bits 3.3:0) .................................................................................63  
7.5.1  
7.5.2  
7.5.3  
7.6  
Register 4: Auto-Negotiation Register ...................................................................65  
Next Page (bit 4.15) ...............................................................................................65  
IEEE Reserved Bit (bit 4.14) ..................................................................................66  
Remote Fault (bit 4.13) ..........................................................................................66  
IEEE Reserved Bits (bits 4.12:10) .........................................................................66  
Technology Ability Field (bits 4.9:5) .......................................................................67  
Selector Field (Bits 4.4:0) .......................................................................................67  
7.6.1  
7.6.2  
7.6.3  
7.6.4  
7.6.5  
7.6.6  
7.7  
Register 5: Auto-Negotiation Link Partner Ability Register ....................................68  
Next Page (bit 5.15) ...............................................................................................68  
Acknowledge (bit 5.14) ..........................................................................................69  
Remote Fault (bit 5.13) ..........................................................................................69  
Technology Ability Field (bits 5.12:5) .....................................................................69  
Selector Field (bits 5.4:0) .......................................................................................69  
7.7.1  
7.7.2  
7.7.3  
7.7.4  
7.7.5  
7.8  
Register 6: Auto-Negotiation Expansion Register ..................................................70  
IEEE Reserved Bits (bits 6.15:5) ...........................................................................70  
Parallel Detection Fault (bit 6.4) .............................................................................71  
Link Partner Next Page Able (bit 6.3) ....................................................................71  
Next Page Able (bit 6.2) .........................................................................................71  
Page Received (bit 6.1) .........................................................................................71  
Link Partner Auto-Negotiation Able (bit 6.0) ..........................................................71  
7.8.1  
7.8.2  
7.8.3  
7.8.4  
7.8.5  
7.8.6  
7.9  
Register 7: Auto-Negotiation Next Page Transmit Register ...................................72  
Next Page (bit 7.15) ...............................................................................................73  
IEEE Reserved Bit (bit 7.14) ..................................................................................73  
Message Page (bit 7.13) ........................................................................................73  
Acknowledge 2 (bit 7.12) .......................................................................................73  
Toggle (bit 7.11) .....................................................................................................73  
Message Code Field / Unformatted Code Field (bits 7.10:0) .................................73  
7.9.1  
7.9.2  
7.9.3  
7.9.4  
7.9.5  
7.9.6  
7.10  
Register 8: Auto-Negotiation Next Page Link Partner Ability Register ...................74  
Next Page (bit 8.15) ...............................................................................................75  
IEEE Reserved Bit (bit 8.14) ..................................................................................75  
Message Page (bit 8.13) ........................................................................................75  
Acknowledge 2 (bit 8.12) .......................................................................................75  
Message Code Field / Unformatted Code Field (bits 8.10:0) .................................75  
7.10.1  
7.10.2  
7.10.3  
7.10.4  
7.10.5  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
5
ICS1893BF Data Sheet - Release  
Table of Contents  
Table of Contents  
Section  
Title  
Page  
7.11  
Register 16: Extended Control Register ................................................................76  
Command Override Write Enable (bit 16.15) .........................................................77  
ICS Reserved (bits 16.14:11) .................................................................................77  
PHY Address (bits 16.10:6) ...................................................................................77  
Stream Cipher Scrambler Test Mode (bit 16.5) .....................................................77  
ICS Reserved (bit 16.4) .........................................................................................77  
NRZ/NRZI Encoding (bit 16.3) ...............................................................................77  
Invalid Error Code Test (bit 16.2) ...........................................................................78  
ICS Reserved (bit 16.1) .........................................................................................78  
Stream Cipher Disable (bit 16.0) ............................................................................78  
7.11.1  
7.11.2  
7.11.3  
7.11.4  
7.11.5  
7.11.6  
7.11.7  
7.11.8  
7.11.9  
7.12  
Register 17: Quick Poll Detailed Status Register ...................................................79  
Data Rate (bit 17.15) ..............................................................................................80  
Duplex (bit 17.14) ...................................................................................................80  
Auto-Negotiation Progress Monitor (bits 17.13:11) ................................................80  
100Base-TX Receive Signal Lost (bit 17.10) .........................................................81  
100Base PLL Lock Error (bit 17.9) .........................................................................81  
False Carrier (bit 17.8) ...........................................................................................82  
Invalid Symbol (bit 17.7) ........................................................................................82  
Halt Symbol (bit 17.6) ............................................................................................82  
Premature End (bit 17.5) ........................................................................................83  
Auto-Negotiation Complete (bit 17.4) .....................................................................83  
100Base-TX Signal Detect (bit 17.3) .....................................................................83  
Jabber Detect (bit 17.2) .........................................................................................83  
Remote Fault (bit 17.1) ..........................................................................................83  
Link Status (bit 17.0) ..............................................................................................83  
7.12.1  
7.12.2  
7.12.3  
7.12.4  
7.12.5  
7.12.6  
7.12.7  
7.12.8  
7.12.9  
7.12.10  
7.12.11  
7.12.12  
7.12.13  
7.12.14  
7.13  
Register 18: 10Base-T Operations Register ..........................................................84  
Remote Jabber Detect (bit 18.15) ..........................................................................84  
Polarity Reversed (bit 18.14) .................................................................................85  
ICS Reserved (bits 18.13:6) ...................................................................................85  
Jabber Inhibit (bit 18.5) ..........................................................................................85  
ICS Reserved (bit 18.4) .........................................................................................85  
Auto Polarity Inhibit (bit 18.3) .................................................................................85  
SQE Test Inhibit (bit 18.2) ......................................................................................85  
Link Loss Inhibit (bit 18.1) ......................................................................................86  
Squelch Inhibit (bit 18.0) ........................................................................................86  
7.13.1  
7.13.2  
7.13.3  
7.13.4  
7.13.5  
7.13.6  
7.13.7  
7.13.8  
7.13.9  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
6
ICS1893BF Data Sheet Rev. F - Release  
Table of Contents  
Table of Contents  
Section  
Title  
Page  
7.14  
Register 19: Extended Control Register 2 .............................................................87  
Node Configuration (bit 19.15) ...............................................................................88  
Hardware/Software Priority Status (bit 19.14) ........................................................88  
Remote Fault (bit 19.13) ........................................................................................88  
ICS Reserved (bits 19.12:10) .................................................................................88  
Auto-MDI/MDIX (bits 19. 9:13)................................................................................88  
Twisted Pair Tri-State Enable, TPTRI (bit 19.7) .....................................................89  
ICS Reserved (bits 19.6:1) .....................................................................................89  
Automatic 100Base-TX Power-Down (bit 19.0) .....................................................89  
7.14.1  
7.14.2  
7.14.3  
7.14.4  
7.14.5  
7.14.6  
7.14.7  
7.14.8  
Chapter 8  
8.1  
Pin Diagram, Listings, and Descriptions.......................................................................90  
ICS1893BF Pin Diagram ........................................................................................90  
8.2  
ICS1893BF Pin Descriptions .................................................................................91  
Transformer Interface Pins .....................................................................................92  
Multi-Function (Multiplexed) Pins: PHY Address and LED Pins .............................92  
Configuration Pins...................................................................................................96  
MAC Interface Pins.................................................................................................97  
Ground and Power Pins........................................................................................101  
ICS1893BK Pin Diagram with MDIX Pinout (56L, 8x8 MLF2) ..............................102  
ICS1893BK Pin Descriptions ................................................................................103  
Transformer Interface Pins ...................................................................................104  
Ground and Power Pins........................................................................................105  
8.2.1  
8.2.2  
8.2.3  
8.2.4  
8.2.5  
8.3  
8.3.1  
8.3.2  
8.3.3  
Chapter 9  
9.1  
DC and AC Operating Conditions.................................................................................106  
Absolute Maximum Ratings .................................................................................106  
9.2  
9.3  
9.4  
9.4.1  
9.4.2  
9.4.3  
9.4.4  
9.5  
9.5.1  
9.5.2  
9.5.3  
9.5.4  
9.5.5  
9.5.6  
9.5.7  
9.5.8  
9.5.9  
9.5.10  
9.5.11  
9.5.12  
9.5.13  
Recommended Operating Conditions ..................................................................106  
Recommended Component Values .....................................................................107  
DC Operating Characteristics ..............................................................................108  
DC Operating Characteristics for Supply Current ................................................108  
DC Operating Characteristics for TTL Inputs and Outputs ..................................108  
DC Operating Characteristics for REF_IN ...........................................................109  
DC Operating Characteristics for Media Independent Interface ..........................109  
Timing Diagrams ..................................................................................................110  
Timing for Clock Reference In (REF_IN) Pin .......................................................110  
Timing for Transmit Clock (TXCLK) Pins .............................................................111  
Timing for Receive Clock (RXCLK) Pins ..............................................................112  
100M MII: Synchronous Transmit Timing .............................................................113  
10M MII: Synchronous Transmit Timing ..............................................................114  
100M/MII Media Independent Interface: Synchronous Receive Timing ...............115  
MII Management Interface Timing .......................................................................116  
10M Media Independent Interface: Receive Latency ...........................................117  
10M Media Independent Interface: Transmit Latency...........................................118  
100M/MII Media Independent Interface: Transmit Latency...................................119  
100M MII: Carrier Assertion/De-Assertion (Half-Duplex Transmission)................120  
10M MII: Carrier Assertion/De-Assertion (Half-Duplex Transmission)..................121  
100M MII Media Independent Interface: Receive Latency....................................122  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
7
ICS1893BF Data Sheet - Release  
Table of Contents  
Table of Contents  
Section  
Title  
Page  
9.5.14  
9.5.15  
9.5.16  
9.5.17  
9.5.18  
9.5.19  
9.5.20  
100M Media Independent Interface: Input-to-Carrier Assertion/De-Assertion......123  
Reset: Power-On Reset .......................................................................................124  
Reset: Hardware Reset and Power-Down ...........................................................125  
10Base-T: Heartbeat Timing (SQE) .....................................................................126  
10Base-T: Jabber Timing .....................................................................................127  
10Base-T: Normal Link Pulse Timing ..................................................................128  
Auto-Negotiation Fast Link Pulse Timing .............................................................129  
Chapter 10  
Chapter 11  
Physical Dimensions of ICS1893BF Package...........................................................130  
Ordering Information....................................................................................................132  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
8
ICS1893BF Data Sheet Rev. F - Release  
Revision History  
Revision History  
• The initial release of this document, Rev A, is dated October 31, 2003  
• Rev. B is dated March 24, 2004. The following list indicates changes made.  
– Page 1. Document status changes from Rev. A to Rev. B. Also, two new bullet items were added to  
Features column, the first for a new package type, the second that the device is available in industrial  
temperature and lead-free. Lastly, bullet item “Supports category 5 cables . . .” deleted.  
– Pages 2 through 8, Table of Contents updated to reflect the Rev. B changes.  
– Page 26. The letters “BF” added to ICS1893 in Figure 5-1.  
– Page 27. ICS1893BF device number added, two places in Figure 5-2.  
– Page 28. Table 5-1 revised.  
– Page 83. Table 7-18. Correction made in Bit 17.3 row.  
– Page 92. Tables 8-1, -2, -3. ICS1893BF device number added to table titles, Table 8-2 deleted. Table  
numbering sequence changed to reflect the deletion.  
– Page 97. ICS1893BF device number added to [now] Table 8-3. New row added to table. Typo  
corrected in Signal Name column. In addition, ICS1893BF device number added to [now] Table 8-4.  
– Page 99. Table 8-7. Typographical corrections (removed unnecessary commas).  
– Three (3) new pages added after Page 106. New material includes 8.3 ICS1893BK Pin Diagram, Pin  
Description in Table 8-10 and -11. In addition, paragraphs 8.5 Transformer Interface Pins and 8.6  
Ground and Power Pins and related Tables 8-13 and 8-14.  
– Page 111. Industrial Temperature operating conditions added to Table 9-2.  
– Page 135. Figure 10-2 Quad Flat/No Lead Plastic Package physical dimensions added.  
– Page 136. Table 11-1 ICS1893BF ordering information revised to add new package options.  
• Rev C is dated September 29, 2005 and the following changes were made:  
– Page 132. Added “T” to the part ordering numbers to designate Tape and Reel packaging.  
• Rev D – Added top-side marking.  
• Rev E, 08/11/09 – Added “EOL” ordering information note per PDN U-09-01.  
• Rev F, 05/13/10 – Removed non-green parts per PDN U-09-01.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
9
ICS1893BF Data Sheet - Release  
Chapter 1 Abbreviations and Acronyms  
Chapter 1 Abbreviations and Acronyms  
Table 1-1 lists and interprets the abbreviations and acronyms used throughout this data sheet.  
Table 1-1. Abbreviations and Acronyms  
Abbreviation /  
Acronym  
Interpretation  
4B/5B  
ANSI  
CMOS  
CSMA/CD  
CW  
4-Bit / 5-Bit Encoding/Decoding  
American National Standards Institute  
complimentary metal-oxide semiconductor  
Carrier Sense Multiple Access with Collision Detection  
Command Override Write  
digital signal processing  
DSP  
ESD  
FDDI  
FLL  
End-of-Stream Delimiter  
Fiber Distributed Data Interface  
frequency-locked loop  
FLP  
Fast Link Pulse  
IDL  
A ‘dead’ time on the link following a 10Base-T packet, not to be confused with idle  
International Electrotechnical Commission  
Institute of Electrical and Electronic Engineers  
International Standards Organization  
Latching High  
IEC  
IEEE  
ISO  
LH  
LL  
Latching Low  
LMX  
MAC  
Max.  
Mbps  
MDI  
Latching Maximum  
Media Access Control  
maximum  
Megabits per second  
Media Dependent Interface  
Media Independent Interface Crossed  
Management Frame  
MDIX  
MF  
MII  
Media Independent Interface  
minimum  
Min.  
MLT-3  
N/A  
Multi-Level Transition Encoding (3 Levels)  
Not Applicable  
NLP  
No.  
Normal Link Pulse  
Number  
NRZ  
NRZI  
Not Return to Zero  
Not Return to Zero, Invert on one  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
10  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 1 Abbreviations and Acronyms  
Table 1-1. Abbreviations and Acronyms (Continued)  
Abbreviation /  
Acronym  
Interpretation  
OSI  
Open Systems Interconnection  
Organizationally Unique Identifier  
Physical Coding sublayer  
physical-layer device  
OUI  
PCS  
PHY  
The ICS1893BF is a physical-layer device, also referred to as a ‘PHY’ or ‘PHYceiver’.  
(The ICS1890 is also a physical-layer device.)  
PLL  
PMA  
PMD  
ppm  
RO  
phase-locked loop  
Physical Medium Attachment  
Physical Medium Dependent  
parts per million  
read only  
R/W  
R/W0  
SC  
read/write  
read/write zero  
self-clearing  
SF  
Special Functions  
Start-of-Frame Delimiter  
SFD  
SI  
Stream Interface, Serial Interface, or Symbol Interface.  
With reference to the MII/SI pin, the acronym ‘SI’ has multiple meanings.  
• Generically, SI means 'Stream Interface', and is documented as such in this data  
sheet.  
• However, when the MAC Interface is configured for:  
– 10M operations, SI is an acronym for 'Serial Interface'.  
– 100M operations, SI is an acronym for 'Symbol Interface'.  
SQE  
SSD  
SSOP  
STA  
Signal Quality Error  
Start-of-Stream Delimiter  
Small Shrink Outline Package  
Station Management Entity  
shielded twisted pair  
STP  
TAF  
Technology Ability Field  
Twisted-Pair Physical Layer Medium Dependent  
typical  
TP-PMD  
Typ.  
UTP  
unshielded twisted pair  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
11  
ICS1893BF Data Sheet - Release  
Chapter 2 Conventions and Nomenclature  
Chapter 2 Conventions and Nomenclature  
Table 2-1 lists and explains the conventions and nomenclature used throughout this data sheet.  
Table 2-1. Conventions and Nomenclature  
Item  
Convention / Nomenclature  
Bits  
• A bit in a register is identified using the format ‘register.bit’. For example, bit  
0.15 is bit 15 of register 0.  
• When a colon is used with bits, it indicates the range of bits. For example,  
bits 1.15:11 are bits 15, 14, 13, 12, and 11 of register 1.  
• For a range of bits, the order is always from the most-significant bit to the  
least-significant bit.  
Code groups  
Colon (:)  
Within this table, see the item ‘Symbols’  
Within this table, see these items:  
• ‘Bits’  
• ‘Pin (or signal) names’  
Numbers  
• As a default, all numbers use the decimal system (that is, base 10) unless  
followed by a lowercase letter. A string of numbers followed by a lowercase  
letter:  
– A ‘b’ represents a binary (base 2) number  
– An ‘h’ represents a hexadecimal (base 16) number  
– An ‘o’ represents an octal (base 8) number  
• All numerical references to registers use decimal notation (and not  
hexadecimal).  
Pin (or signal) names  
• All pin or signal names are provided in capital letters.  
• A pin name that includes a forward slash ‘/’ is a multi-function, configuration  
pin. These pins provide the ability to select between two ICS1893BF  
functions. The name provided:  
– Before the ‘/’ indicates the pin name and function when the signal level  
on the pin is logic zero.  
– After the ‘/’ indicates the pin name and function when the signal level on  
the pin is logic one.  
For example, the HW/SW pin selects between Hardware (HW) mode and  
Software (SW) mode. When the signal level on the HW/SW pin is logic:  
– Zero, the ICS1893BF Hardware mode is selected.  
– One, the ICS1893BF Software mode is selected.  
• An ‘n’ appended to the end of a pin name or signal name (such as  
RESETn) indicates an active-low operation.  
• When a colon is used with pin or signal names, it indicates a range. For  
example, TXD[3:0] represents pins/signals TXD3, TXD2, TXD1, and TXD0.  
• When pin name abbreviations are spelled out, words in parentheses  
indicate additional description that is not part of the pin name abbreviation.  
Registers  
• A bit in a register is identified using the format ‘register.bit’. For example, bit  
0.15 is bit 15 of register 0.  
• All numerical references to registers use decimal notation (and not  
hexadecimal).  
• When register name abbreviations are spelled out, words in parentheses  
indicate additional description that is not part of the register name  
abbreviation.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
12  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 2 Conventions and Nomenclature  
Table 2-1. Conventions and Nomenclature (Continued)  
Item  
Convention / Nomenclature  
• When referring to signals, the terms:  
Signal references  
– ‘FALSE’, ‘low’, or ‘zero’ represent signals that are logic zero.  
– ‘TRUE’, ‘high’, or ‘one’ represent signals that are logic one.  
• Chapter 9, “DC and AC Operating Conditions” defines the electrical  
specifications for ‘logic zero’ and ‘logic one’ signals.  
Symbols  
• In this data sheet, code group names are referred to as ‘symbols’ and they  
are shown between '/' (slashes). For example, the symbol /J/ represents  
the first half of the Start-of-Stream Delimiter (SSD1).  
• Symbol sequences are shown in succession. For example, /I/J/K/  
represents an IDLE followed by the SSD.  
Terms:  
‘set’,  
The terms ‘set’, ‘active’, and ‘asserted’ are synonymous.  
They do not necessarily infer logic one.  
‘active’,  
‘asserted’,  
(For example, an active-low signal can be set to logic zero.)  
Terms:  
The terms ‘cleared’, ‘inactive’, and ‘de-asserted’ are synonymous.  
They do not necessarily infer logic zero.  
‘cleared’,  
‘de-asserted’,  
‘inactive’  
Terms:  
‘twisted-pair receiver’  
In reference to the ICS1893BF, the term ‘Twisted-Pair Receiver’ refers to the  
set of Twisted-Pair Receive output pins (TP_RXP and TP_RXN).  
Terms:  
In reference to the ICS1893BF, the term ‘Twisted-Pair Transmitter’ refers to  
‘twisted-pair transmitter’ the set of Twisted-Pair Transmit output pins (TP_TXP and TP_TXN).  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
13  
ICS1893BF Data Sheet - Release  
Chapter 3 Overview of the ICS1893BF  
Chapter 3 Overview of the ICS1893BF  
The ICS1893BF is a stream processor. During data transmission, it accepts sequential nibbles from its  
MAC (Media Access Control) converts them into a serial bit stream, encodes them, and transmits them  
over the medium through an external isolation transformer. When receiving data, the ICS1893BF converts  
and decodes a serial bit stream (acquired from an isolation transformer that interfaces with the medium)  
into sequential nibbles. It subsequently presents these nibbles to its MAC Interface.  
The ICS1893BF implements the OSI model’s physical layer, consisting of the following, as defined by the  
ISO/IEC 8802-3 standard:  
• Physical Coding sublayer (PCS)  
• Physical Medium Attachment sublayer (PMA)  
• Physical Medium Dependent sublayer (PMD)  
• Auto-Negotiation sublayer  
The ICS1893BF is transparent to the next layer of the OSI model, the link layer. The link layer has two  
sublayers: the Logical Link Control sublayer and the MAC sublayer. The ICS1893BF can interface directly  
to the MAC.  
The ICS1893BF transmits framed packets acquired from its MAC Interface and receives encapsulated  
packets from another PHY, which it translates and presents to its MAC Interface.  
Note: As per the ISO/IEC standard, the ICS1893BF does not affect, nor is it affected by, the underlying  
structure of the MAC frame it is conveying.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
14  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 3 Overview of the ICS1893BF  
3.1 100Base-TX Operation  
During 100Base-TX data transmission, the ICS1893BF accepts packets from a MAC and inserts  
Start-of-Stream Delimiters (SSDs) and End-of-Stream Delimiters (ESDs) into the data stream. The  
ICS1893BF encapsulates each MAC frame, including the preamble, with an SSD and an ESD. As per the  
ISO/IEC Standard, the ICS1893BF replaces the first octet of each MAC preamble with an SSD and  
appends an ESD to the end of each MAC frame.  
When receiving data from the medium, the ICS1893BF removes each SSD and replaces it with the  
pre-defined preamble pattern before presenting the nibbles to its MAC Interface. When the ICS1893BF  
encounters an ESD in the received data stream, signifying the end of the frame, it ends the presentation of  
nibbles to its MAC Interface. Therefore, the local MAC receives an unaltered copy of the transmitted frame  
sent by the remote MAC.  
During periods when MAC frames are being neither transmitted nor received, the ICS1893BF signals and  
detects the IDLE condition on the Link Segment. In the 100Base-TX mode, the ICS1893BF transmit  
channel sends a continuous stream of scrambled ones to signify the IDLE condition. Similarly, the  
ICS1893BF receive channel continually monitors its data stream and looks for a pattern of scrambled ones.  
The results of this signaling and monitoring provide the ICS1893BF with the means to establish the integrity  
of the Link Segment between itself and its remote link partner and inform its Station Management Entity  
(STA) of the link status.  
For 100M data transmission, the ICS1893BF MAC Interface is configured to provide a 100M Media  
Independent Interface (MII).  
3.2 10Base-T Operation  
During 10Base-T data transmission, the ICS1893BF inserts only the IDL delimiter into the data stream. The  
ICS1893BF appends the IDL delimiter to the end of each MAC frame. However, since the 10Base-T  
preamble already has a Start-of-Frame delimiter (SFD), it is not required that the ICS1893BF insert an  
SSD-like delimiter.  
When receiving data from the medium (such as a twisted-pair cable), the ICS1893BF uses the preamble to  
synchronize its receive clock. When the ICS1893BF receive clock establishes lock, it presents the  
preamble nibbles to its MAC Interface. The 10M MAC Interface uses the standard MII Interface.  
In 10M operations, during periods when MAC frames are being neither transmitted nor received, the  
ICS1893BF signals and detects Normal Link Pulses. This action allows the integrity of the Link Segment  
with the remote link partner to be established and then reported to the ICS1893BF’s STA.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
15  
ICS1893BF Data Sheet - Release  
Chapter 4 Operating Modes Overview  
Chapter 4 Operating Modes Overview  
The ICS1893BF operating modes are typically controlled from software.  
The ICS1893BF register bits are accessible through a standard MII (Media Independent Interface) Serial  
Management Port.  
The ICS1893BF is configured to support the MAC Interface as a 10M MII or a 100M MII. The protocol on  
the Medium Dependent Interface (MDI) can be configured to support either 10M or 100M operations in  
either half-duplex or full-duplex modes.  
The ICS1893BF is fully compliant with the ISO/IEC 8802-3 standard, as it pertains to both 10Base-T and  
100Base-TX operations. The feature-rich ICS1893BF allows easy migration from 10-Mbps to 100-Mbps  
operations as well as from systems that require support of both 10M and 100M links.  
This chapter is an overview of the following ICS1893BF modes of operation:  
• Section 4.1, “Reset Operations”  
• Section 4.2, “Power-Down Operations”  
• Section 4.3, “Automatic Power-Saving Operations”  
• Section 4.4, “Auto-Negotiation Operations”  
• Section 4.5, “100Base-TX Operations”  
• Section 4.6, “10Base-T Operations”  
• Section 4.7, “Half-Duplex and Full-Duplex Operations”  
• Section 4.8, “Auto-MDI/MDIX Crossover”  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
16  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 4 Operating Modes Overview  
4.1 Reset Operations  
This section first discusses reset operations in general and then specific ways in which the ICS1893BF can  
be configured for various reset options.  
4.1.1 General Reset Operations  
The following reset operations apply to all the specific ways in which the ICS1893BF can be reset, which  
are discussed in Section 4.1.2, “Specific Reset Operations”.  
4.1.1.1 Entering Reset  
When the ICS1893BF enters a reset condition (either through hardware, power-on reset, or software), it  
does the following:  
1. Isolates the MAC Interface input pins  
2. Drives all MAC Interface output pins low  
3. Tri-states the signals on its Twisted-Pair Transmit pins (TP_TXP and TP_TXN)  
4. Initializes all its internal modules and state machines to their default states  
5. Enters the power-down state  
6. Initializes all internal latching low (LL), latching high (LH), and latching maximum (LMX) Management  
Register bits to their default values  
4.1.1.2 Exiting Reset  
When the ICS1893BF exits a reset condition, it does the following:  
1. Exits the power-down state  
2. Latches the Serial Management Port Address of the ICS1893BF into the Extended Control Register,  
bits 16.10:6. [See Section 7.11.3, “PHY Address (bits 16.10:6)”.]  
3. Enables all its internal modules and state machines  
4. Sets all Management Register bits to their default values  
5. Enables the Twisted-Pair Transmit pins (TP_TXP and TP_TXN)  
6. Resynchronizes both its Transmit and Receive Phase-Locked Loops, which provide its transmit clock  
(TXCLK) and receive clock (RXCLK)  
7. Releases all MAC Interface pins, which takes a maximum of 640 ns after the reset condition is removed  
4.1.1.3 Hot Insertion  
As with the ICS189X products, the ICS1893BF reset design supports ‘hot insertion’ of its MII. (That is, the  
ICS1893BF can connect its MAC Interface to a MAC while power is already applied to the MAC.)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
17  
ICS1893BF Data Sheet - Release  
Chapter 4 Operating Modes Overview  
4.1.2 Specific Reset Operations  
This section discusses the following specific ways that the ICS1893BF can be reset:  
• Hardware reset (using the RESETn pin)  
• Power-on reset (applying power to the ICS1893BF)  
• Software reset (using Control Register bit 0.15)  
Note: At the completion of a reset (either hardware, power-on, or software), the ICS1893BF sets all  
registers to their default values.  
4.1.2.1 Hardware Reset  
Entering Hardware Reset  
Holding the active-low RESETn pin low for a minimum of five REF_IN clock cycles initiates a hardware  
reset (that is, the ICS1893BF enters the reset state). During reset, the ICS1893BF executes the steps  
listed in Section 4.1.1.1, “Entering Reset”.  
Exiting Hardware Reset  
After the signal on the RESETn pin transitions from a low to a high state, the ICS1893BF completes in 640  
ns (that is, in 16 REF_IN clocks) steps 1 through 5, listed in Section 4.1.1.2, “Exiting Reset”. After the first  
five steps are completed, the Serial Management Port is ready for normal operations, but this action does  
not signify the end of the reset cycle. The reset cycle completes when the transmit clock (TXCLK) and  
receive clock (RXCLK) are available, which is typically 53 ms after the RESETn pin goes high. [For details  
on this transition, see Section 9.5.16, “Reset: Hardware Reset and Power-Down”.]  
Note:  
1. The MAC Interface is not available for use until the TXCLK and RXCLK are valid.  
2. The Control Register bit 0.15 does not represent the status of a hardware reset. It is a self-clearing bit  
that is used to initiate a software reset.  
4.1.2.2 Power-On Reset  
Entering Power-On Reset  
When power is applied to the ICS1893BF, it waits until the potential between VDD and VSS achieves a  
minimum voltage before entering reset and executing the steps listed in Section 4.1.1.1, “Entering Reset”.  
After entering reset from a power-on condition, the ICS1893BF remains in reset for approximately 20 µs.  
(For details on this transition, see Section 9.5.15, “Reset: Power-On Reset”.)  
Exiting Power-On Reset  
The ICS1893BF automatically exits reset and performs the same steps as for a hardware reset. (See  
Section 4.1.1.2, “Exiting Reset”.)  
Note: The only difference between a hardware reset and a power-on reset is that during a power-on  
reset, the ICS1893BF isolates its RESETn input pin. All other functionality is the same. As with a  
hardware reset, Control Register bit 0.15 does not represent the status of a power-on reset.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
18  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 4 Operating Modes Overview  
4.1.2.3 Software Reset  
Entering Software Reset  
Initiation of a software reset occurs when a management entity writes a logic one to Control Register bit  
0.15. When this write occurs, the ICS1893BF enters the reset state for two REF_IN clock cycles.  
Note: Entering a software reset is nearly identical to entering a hardware reset or a power-on reset,  
except that during a software-initiated reset, the ICS1893BF does not enter the power-down state.  
Exiting Software Reset  
At the completion of a reset (either hardware, power-on, or software), the ICS1893BF sets all registers to  
their default values. This action automatically clears (that is, sets equal to logic zero) Control Register bit  
0.15, the software reset bit. Therefore, for a software reset (only), bit 0.15 is a self-clearing bit that indicates  
the completion of the reset process.  
Note:  
1. The RESETn pin is active low but Control Register bit 0.15 is active high.  
2. Exiting a software reset is nearly identical to exiting a hardware reset or a power-on reset, except that  
upon exiting a software-initiated reset, the ICS1893BF does not re-latch its Serial Management Port  
Address into the Extended Control Register. [For information on the Serial Management Port Address,  
see Section 7.11.3, “PHY Address (bits 16.10:6)”.]  
3. The Control Register bit 0.15 does not represent the status of a hardware reset. It is a self-clearing bit  
that is used to initiate a software reset. During a hardware or power-on reset, Control Register bit 0.15  
does not get set to logic one. As a result, this bit 0.15 cannot be used to indicate the completion of the  
reset process for hardware or power-on resets.  
4.2 Power-Down Operations  
The ICS1893BF enters the power-down state whenever either (1) the RESETn pin is low or (2) Control  
Register bit 0.11 (the Power-Down bit) is logic one. In the power-down state, the ICS1893BF disables all  
internal functions and drives all MAC Interface output pins to logic zero except for those that support the MII  
Serial Management Port. In addition, the ICS1893BF tri-states its Twisted-Pair Transmit pins (TP_TXP and  
TP_TXN) to achieve an additional reduction in power.  
There is one significant difference between entering the power-down state by setting Control Register bit  
0.11 as opposed to entering the power-down state during a reset. When the ICS1893BF enters the  
power-down state:  
• By setting Control Register bit 0.11, the ICS1893BF maintains the value of all Management Register bits  
except for the latching low (LL), latching high (LH), and latching maximum (LMX) status bits. Instead,  
these LL, LH, and LMX Management Register bits are re-initialized to their default values.  
• During a reset, the ICS1893BF sets all of its Management Register bits to their default values. It does not  
maintain the state of any Management Register bit.  
For more information on power-down operations, see the following:  
• Section 7.14, “Register 19: Extended Control Register 2”  
• Section 9.4, “DC Operating Characteristics”, which has tables that specify the ICS1893BF power  
consumption while in the power-down state  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
19  
ICS1893BF Data Sheet - Release  
Chapter 4 Operating Modes Overview  
4.3 Automatic Power-Saving Operations  
The ICS1893BF has power-saving features that automatically minimize its total power consumption while it  
is operating. Table 4-1 lists the ICS1893BF automatic power-saving features for the various modes.  
Table 4-1. Automatic Power-Saving Features, 10Base-T and 100Base-TX Modes  
Power-  
Saving  
Feature  
Mode for ICS1893BF  
10Base-T Mode  
100Base-TX Mode  
Disable Inter- In 10Base-T mode, the ICS1893BF  
nal Modules disables all its internal 100Base-TX  
modules.  
In 100Base-TX mode, the ICS1893BF  
disables all its internal 10Base-T modules.  
STA Control When an STA sets the state of the  
of Automatic ICS1893BF Extended Control Register 2,  
When an STA sets the state of the  
ICS1893BF Extended Control Register 2,  
bit 19.1 to logic:  
• Zero, the 10Base-T modules always  
remain enabled, even during  
100Base-TX operations.  
Power-  
Saving  
Features  
bit 19.0 to logic:  
• Zero, the 100Base-TX modules always  
remain enabled, even during 10Base-T  
operations.  
• One, the ICS1893BF automatically  
disables 100Base-TX modules while the  
ICS1893BF is operating in 10Base-T  
mode.  
• One, the ICS1893BF automatically  
disables 10Base-T modules while the  
ICS1893BF is operating in 100Base-TX  
mode.  
4.4 Auto-Negotiation Operations  
The ICS1893BF has an Auto-Negotiation sublayer and provides a Control Register bit (bit 0.12) to  
determine whether its Auto-Negotiation sublayer is enabled or disabled.  
When enabled, the ICS1893BF Auto-Negotiation sublayer exchanges technology capability data with its  
remote link partner and automatically selects the highest-performance operating mode it has in common  
with its remote link partner. For example, if the ICS1893BF supports 100Base-TX and 10Base-T modes –  
but its link partner supports 100Base-TX and 100Base-T4 modes – the two devices automatically select  
100Base-TX as the highest-performance common operating mode. For details regarding initialization and  
control of the auto-negotiation process, see Section 6.2, “Functional Block: Auto-Negotiation”.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
20  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 4 Operating Modes Overview  
4.5 100Base-TX Operations  
The ICS1893BF 100Base-TX mode provides 100Base-TX physical layer (PHY) services as defined in the  
ISO/IEC 8802-3 standard. In the 100Base-TX mode, the ICS1893BF is a 100M translator between a MAC  
and the physical transmission medium. As such, the ICS1893BF has two interfaces, both of which are fully  
configurable: one to the MAC and one to the Link Segment. In 100Base-TX mode, the ICS1893BF provides  
the following functions:  
• Data conversion from both parallel-to-serial and serial-to-parallel formats  
• Data encoding/decoding (4B/5B, NRZ/NRZI, and MLT-3)  
• Data scrambling/descrambling  
• Data transmission/reception over a twisted-pair medium  
To accurately transmit and receive data, the ICS1893BF employs DSP-based wave shaping, adaptive  
equalization, and baseline wander correction. In addition, in 100Base-TX mode, the ICS1893BF provides a  
variety of control and status means to assist with Link Segment management. For more information on  
100Base-TX, see Section 6.4, “Functional Block: 100Base-TX TP-PMD Operations”.  
4.6 10Base-T Operations  
The ICS1893BF 10Base-T mode provides 10Base-T physical layer (PHY) services as defined in the  
ISO/IEC 8802-3 standard. In the 10Base-T mode, the ICS1893BF is a 10M translator between a MAC and  
the physical transmission medium. In 10Base-T mode, the ICS1893BF provides the following functions:  
• Data conversion from both parallel-to-serial and serial-to-parallel formats  
• Manchester data encoding/decoding  
• Data transmission/reception over a twisted-pair medium  
4.7 Half-Duplex and Full-Duplex Operations  
The ICS1893BF supports half-duplex and full-duplex operations for both 10Base-T and 100Base-TX  
applications. Full-duplex operation allows simultaneous transmission and reception of data, which  
effectively doubles the Link Segment throughput to either 20 Mbps (for 10Base-T operations) or 200 Mbps  
(for 100Base-TX operations).  
As per the ISO/IEC standard, full-duplex operations differ slightly from half-duplex operations. These  
differences are necessary, as during full-duplex operations a PHY actively uses both its transmit and  
receive data paths simultaneously.  
• In 10Base-T full-duplex operations, the ICS1893BF disables its loopback function (that is, it does not  
automatically loop back data from its transmitter to its receiver) and disables its SQE Test function.  
• In both 10Base-T and 100Base-TX full-duplex operations, the ICS1893BF asserts its CRS signal only in  
response to receive activity while its COL signal always remains inactive.  
For more information on half-duplex and full-duplex operations, see the following sections:  
• Section 7.2, “Register 0: Control Register”  
• Section 7.2.8, “Duplex Mode (bit 0.8)”  
• Section 7.3, “Register 1: Status Register”  
• Section 7.6, “Register 4: Auto-Negotiation Register”  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
21  
ICS1893BF Data Sheet - Release  
Chapter 4 Operating Modes Overview  
4.8 Auto-MDI/MDIX Crossover (New)  
The ICS1893BF includes the auto-MDI/MDIX crossover feature. In a typical CAT 5 Ethernet installation the  
transmit twisted pair signal pins of the RJ45 connector are crossed over in the CAT 5 wiring to the partners  
receive twisted pair signal pins and receive twisted pair to the partners transmit twisted pair. This is usually  
accomplished in the wiring plant. Hubs generally wire the RJ45 connector crossed to accomplish the  
crossover. Two types of CAT 5 cables (straight and crossed) are available to achieve the correct  
connection. The Auto-MDI/MDIX feature automatically corrects for miss-wired installations by automatically  
swapping transmit and receive signal pairs at the PHY when no link results. Auto-MDI/MDIX is automatic,  
but may be disabled for test purposes using the AMDIX_EN pin or by writing MDIO register 19 Bits 9:8 in  
the MDIO register. The Auto-MDI/MDIX function is independent of Auto-Negotiation and preceeds  
Auto-Negotiation when enabled.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
22  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 5 Interface Overviews  
Chapter 5 Interface Overviews  
The ICS1893BF MAC Interface is fully configurable, thereby allowing it to accommodate many different  
applications.  
This chapter includes overviews of the following MAC-to-PHY interfaces:  
• Section 5.1, “MII Data Interface”  
• Section 5.2, “Serial Management Interface”  
• Section 5.3, “Twisted-Pair Interface”  
• Section 5.4, “Clock Reference Interface”  
• Section 5.5, “Status Interface”  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
23  
ICS1893BF Data Sheet - Release  
Chapter 5 Interface Overviews  
5.1 MII Data Interface  
The ICS1893BF’s MAC Interface is the Media Independent Interface (MII) operating at either 10 Mbps or  
100 Mbps. The ICS1893BF MAC Interface is configured for the MII Data Interface mode, data is transferred  
between the PHY and the MAC as framed, 4-bit parallel nibbles. In addition, the interface also provides  
status and control signals to synchronize the transfers.  
The ICS1893BF provides a full complement of the ISO/IEC-specified MII signals. Its MII has both a transmit  
and a receive data path to synchronously exchange 4 bits of data (that is, nibbles).  
• The ICS1893BF’s MII transmit data path includes the following:  
– A data nibble, TXD[3:0]  
– A transmit data clock to synchronize transfers, TXCLK  
– A transmit enable signal, TXEN  
– The TXER pin is not available on the ICS1893BF  
• The ICS1893BF’s MII receive data path includes the following:  
– A separate data nibble, RXD[3:0]  
– A receive data clock to synchronize transfers, RXCLK  
– A receive data valid signal, RXDV  
Both the MII transmit clock and the MII receive clock are provided to the MAC/Reconciliation sublayer by  
the ICS1893BF (that is, the ICS1893BF sources the TXCLK and RXCLK signals to the MAC).  
Clause 22 also defines as part of the MII a Carrier Sense signal (CRS) and a Collision Detect signal (COL).  
The ICS1893BF is fully compliant with these definitions and sources both of these signals to the MAC.  
When operating in:  
• Half-duplex mode, the ICS1893BF asserts the Carrier Sense signal when data is being either transmitted  
or received. While operating in half-duplex mode, the ICS1893BF also asserts its Collision Detect signal  
to indicate that data is being received while a transmission is in progress.  
• Full-duplex mode, the ICS1893BF asserts the Carrier Sense signal only when receiving data and forces  
the Collision Detect signal to remain inactive.  
As mentioned in Section 4.1.1.3, “Hot Insertion”, the ICS1893BF design allows hot insertion of its MII. That  
is, it is possible to connect its MII to a MAC when power is already applied to the MAC. To support this  
functionality, the ICS1893BF isolates its MII signals and tri-states the signals on all Twisted-Pair Transmit  
pins (TP_TXP and TP_TXN) during a power-on reset. Upon completion of the reset process, the  
ICS1893BF enables its MII and enables its Twisted-Pair Transmit signals.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
24  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 5 Interface Overviews  
5.2 Serial Management Interface  
The ICS1893BF provides an ISO/IEC compliant, two-wire Serial Management Interface as part of its MAC  
Interface. This Serial Management Interface is used to exchange control, status, and configuration  
information between a Station Management entity (STA) and the physical layer device (PHY), that is, the  
ICS1893BF.  
The ISO/IEC standard also specifies a frame structure and protocol for this interface as well as a set of  
Management Registers that provide the STA with access to a PHY such as the ICS1893BF. A Serial  
Management Interface is comprised of two signals: a bi-directional data pin (MDIO) along with an  
associated input pin for a clock (MDC). The clock is used to synchronize all data transfers between the  
ICS1893BF and the STA.  
In addition to the ISO/IEC defined registers, the ICS1893BF provides several extended status and control  
registers to provide more refined control of the MII and MDI interfaces. For example, the QuickPoll Detailed  
Status Register provides the ability to acquire the most-important status functions with a single MDIO read.  
Note: In the ICS1893BF, the MDIO and MDC pins remain active for all the MAC Interface modes (that is,  
10M MII, 100M MII, 100M Symbol, and 10M Serial).  
5.3 Twisted-Pair Interface  
For the twisted-pair interface, the ICS1893BF uses 1:1 ratio transformers for both transmit and receive.  
Better operation results from using a split ground plane through the transformer. In this case:  
• The RJ-45 transformer windings must be on the chassis ground plane along with the Bob Smith  
termination.  
• The ICS1893BF system ground plane must include the ICS1893BF-side transformer windings along with  
the 61.9Ω resistors and the 120-nH inductor.  
• The transformer provides the isolation with one set of windings on one ground plane and another set of  
windings on the second ground plane.  
5.3.1 Twisted-Pair Transmitter  
The twisted-pair transmitter driver uses an H-bridge configuration. IDT transformer requirements:  
• Turns Ratio 1:1  
• Chokes may be used on chip or cable side or both sides  
• No power connections to the transformer. Transformer power is supplied by the ICS1893BF  
• MIDCOM 7090-37 or equivalent symetrical magnetics are used  
Figure 5-1 shows the design for the ICS1893BF twisted-pair interface.  
• Two 61.9Ω1% resistors are in series, with a 120-nH 5% inductor between them. These components form  
a network that connects across both pairs of twisted pairs A and B.  
• The center taps on the chip side are each bypassed to VSS with a 0.1uf capacitor. Do not connect the  
chip side center taps together (use separate bypass capacitors). The ICS1893BF biases the selected  
transmit pair and receive pair differently based on assigned function.  
• Both twisted pairs A and B have an assigned plus and minus.  
Note:  
1. Keep all TX traces as short as possible.  
2. When longer board twisted pair traces are used, 50Ω-characteristic board trace impedance is  
desirable.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
25  
ICS1893BF Data Sheet - Release  
Chapter 5 Interface Overviews  
Figure 5-1. ICS1893BF Twisted Pair  
System Ground Plane Chassis Ground Plane  
Separate Ground Plane  
1:1  
TP_AP 12  
61.9Ω 1%  
Center  
Tap  
ICS1893BF  
To RJ-45  
120 nH  
3PF  
61.9Ω 1%  
TP_AN 13  
75Ω  
Ideally, for these traces Z = 50Ω.  
o
0.1 µF  
TP_BP 16  
61.9Ω 1%  
Center  
Tap  
To RJ-45  
120 nH  
3PF  
61.9Ω 1%  
TP_BN 15  
75Ω  
0.1 µF  
0.1 µF  
Ideally, for these traces Z = 50Ω.  
o
Chassis GND  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
26  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 5 Interface Overviews  
5.4 Clock Reference Interface  
The REF_IN pin provides the ICS1893BF Clock Reference Interface. The ICS1893BF requires a single  
clock reference with a frequency of 25 MHz ±50 parts per million. This accuracy is necessary to meet the  
interface requirements of the ISO/IEEE 8802-3 standard, specifically clauses 22.2.2.1 and 24.2.3.4. The  
ICS1893BF supports two clock source configurations: a CMOS oscillator or a CMOS driver. The input to  
REF_IN is CMOS (10% to 90% VDD), not TTL. Alternately, a 25MHz crystal may be used. The Oscillator  
specifications are shown in Table 5.2.  
Figure 5-2. Crystal or Oscillator Operation  
Crystal  
ICS1893BF  
REF_OUT  
46  
REF_IN  
47  
25.000MHz  
33 pF  
33 pF  
Oscillator  
ICS1893BF  
REF_OUT  
46  
REF_IN  
47  
NC  
33 Ohm  
CMOS  
25.000  
MHz  
10 pF  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
27  
ICS1893BF Data Sheet - Release  
Chapter 5 Interface Overviews  
If a crystal is used as the clocking source, connect it to both the Ref_in (pin 47) and Ref_out (pin 46) pins  
of the ICS1893BF. A pair of bypass capacitors on either side of the crystal are connected to ground. The  
crystal is used in the parallel resonance or anti-resonance mode. The value of the bypass caps serve to  
adjust the final frequency of the crystal oscillation. Typical applications would use 33pF bypass caps. The  
exact value will be affected by the board routing capacitance on Ref_in and Ref_out pins. Smaller bypass  
capacitors raise the frequency of oscillation. Once the exact value of bypass capacitance is established it  
will be the same for all boards using the same specification crystal. The best way to measure the crystal  
frequency is to measure the frequency of TXCLK (pin 37) using a frequency counter with a 10 second  
sample. Using TXCLK prevents affecting the crystal frequency by the measurement. The crystal  
specification is shown in Table 5.1.  
Table 5-1. 25MHz Crystal Specification  
Specifications  
Symbol Minimum  
Typical Maximum  
Unit  
Fundamental Frequency  
(tolerance is sum of freq.,  
temp., stability and aging.)  
F0  
24.99875 25.00000 25.00125  
MHz  
Freq. Tolerance  
∆F/f  
Cin  
50  
ppm  
pF  
Input Capacitance  
3
Table 5-2. 25MHz Oscillator Specification  
Specifications  
Symbol Minimum  
Typical Maximum  
24.99875 25.00000 25.00125  
50  
Unit  
MHz  
ppm  
%
Output Frequency  
F0  
Freq. Stability (including aging) ∆F/f  
Duty cycle CMOS level  
one-half VDD  
Tw/T  
35  
65  
VIH  
2.79  
Volts  
Volts  
pS  
VIL  
0.33  
500  
Period Jitter  
Input Capacitance  
Tjitter  
CIN  
3
pF  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
28  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 5 Interface Overviews  
5.5 Status Interface  
The ICS1893BF provides five multi-function configuration pins that report the results of continual link  
monitoring by providing signals that are intended for driving LEDs. (For the pin numbers, see Table 8.6.)  
Table 5-3. Pins for Monitoring the Data Link  
Pin  
P0AC  
LED Driven by the Pin’s Output Signal  
AC (Link Activity) LED  
P1CL  
P2LI  
CL (Collisions) LED  
LI (Link Integrity) LED  
P3TD  
P4RD  
TD (Transmit Data) LED  
RD (Receive Data) LED  
Note:  
1. During either a power-on reset or a hardware reset, each multi-function configuration pin is an input  
that is sampled when the ICS1893BF exits the reset state. After sampling is complete, these pins are  
output pins that can drive status LEDs.  
2. A software reset does not affect the state of a multi-function configuration pin. During a software reset,  
all multi-function configuration pins are outputs.  
3. Each multi-function configuration pin must be pulled either up or down with a resistor to establish the  
address of the ICS1893BF. LEDs may be placed in series with these resistors to provide a designated  
status indicator as described in Table 5-3.  
Caution: All pins listed in Table 5-3 must not float.  
4. As outputs, the asserted state of a multi-function configuration pin is the inverse of the sense sampled  
during reset. This inversion provides a signal that can illuminate an LED during an asserted state. For  
example, if a multi-function configuration pin is pulled down to ground through an LED and a  
current-limiting resistor, then the sampled sense of the input is low. To illuminate this LED for the  
asserted state, the output is driven high.  
5. Adding 10KΩ resistors across the LEDs ensures the PHY address is fully defined during slow VDD  
power-ramp conditions.  
6. PHY address 00 tri-states the MII interface. (Do not select PHY address 00 unless you want the MII  
tri-stated.)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
29  
ICS1893BF Data Sheet - Release  
Chapter 5 Interface Overviews  
Figure 5-3 shows typical biasing and LED connections for the ICS1893BF.  
Figure 5-3. ICS1893BF LED - PHY Interface  
ICS1893BF  
P4RD  
8
P3TD  
6
P2LI  
4
P1CL  
3
P0AC  
1
REC  
LINK  
ACTIVITY  
COL  
TRANS  
VDD  
10KΩ  
10KΩ  
1KΩ  
LED  
10KΩ  
1KΩ  
LED  
10KΩ  
1KΩ  
LED  
10KΩ  
This circuit decodes to PHY address = 1.  
Notes:  
1. All LED pins must be set during reset.  
2. Caution: PHY address 00 tri-states the MII interface. Don’t use PHY address 00.  
3. For more reliable address capture during power-on reset, add a 10KΩ resistor across  
the LED.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
30  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
Chapter 6 Functional Blocks  
This chapter discusses the following ICS1893BF functional blocks.  
• Section 6.1, “Functional Block: Media Independent Interface”  
• Section 6.2, “Functional Block: Auto-Negotiation”  
• Section 6.3, “Functional Block: 100Base-X PCS and PMA Sublayers”  
• Section 6.4, “Functional Block: 100Base-TX TP-PMD Operations”  
• Section 6.5, “Functional Block: 10Base-T Operations”  
• Section 6.6, “Functional Block: Management Interface”  
ICS1893BF, Rev. F, 5/13/10  
Copyright © 2009, IDT, Inc.  
May, 2010  
All rights reserved.  
31  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
6.1 Functional Block: Media Independent Interface  
All ICS1893BF MII interface signals are fully compliant with the ISO/IEC 8802-3 standard. In addition, the  
ICS1893BF MIIs can support two data transfer rates: 25 MHz (for 100Base-TX operations) and 2.5 MHz  
(for 10Base-T operations).  
The Media Independent Interface (MII) consists of two primary components:  
1. An interface between a MAC (Media Access Control sublayer) and the PHY (that is, the ICS1893BF).  
This MAC-PHY part of the MII consists of three subcomponents:  
a. A synchronous Transmit interface that includes the following signals:  
(1) A data nibble, TXD[3:0]  
(2) A delimiter, TXEN  
(3) A clock, TXCLK  
b. A synchronous Receive interface that includes the followings signals:  
(1) A data nibble, RXD[3:0]  
(2) An error indicator, RXER  
(3) A delimiter, RXDV  
(4) A clock, RXCLK  
c. A Media Status or Control interface that consists of a Carrier Sense signal (CRS) and a Collision  
Detection signal (COL).  
2. An interface between the PHY (the ICS1893BF) and an STA (Station Management entity). The  
STA-PHY part of the MII is a two-wire, Serial Management Interface that consists of the following:  
a. A clock (MDC)  
b. A synchronous, bi-directional data signal (MDIO) that provides an STA with access to the  
ICS1893BF Management Register set  
The ICS1893BF Management Register set (discussed in Chapter 7, “Management Register Set”) consists  
of the following:  
• Basic Management registers.  
As defined in the ISO/IEC 8802-3 standard, these registers include the following:  
– Control Register (register 0), which handles basic device configuration  
– Status Register (register 1), which reports basic device capabilities and status  
• Extended Management registers.  
As defined in the ISO/IEC 8802-3 standard, the ICS1893BF supports Extended registers that provide  
access to the Organizationally Unique Identifier and all auto-negotiation functionality.  
• ICS (Vendor-Specific) Management registers.  
The ICS1893BF provides vendor-specific registers for enhanced PHY operations. Among these is the  
QuickPoll Detailed Status Register that provides a comprehensive and consolidated set of real-time PHY  
information. Reading the QuickPoll register enables the MAC to obtain comprehensive status data with a  
single register access.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
32  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
6.2 Functional Block: Auto-Negotiation  
The auto-negotiation logic of the ICS1893BF has the following main functions:  
• To determine the capabilities of the remote link partner, (that is, the device at the other end of the link  
segment’s medium or cable)  
• To advertise the capabilities of the ICS1893BF to the remote link partner  
• To establish a protocol with the remote link partner using the highest-performance operating mode that  
they have in common  
The design of the ICS1893BF Auto-Negotiation sublayer supports both legacy 10Base-T connections as  
well as new connections that have multiple technology options for the link. For example, when the  
ICS1893BF has the auto-negotiation process enabled and it is operating with a 10Base-T remote link  
partner, the ICS1893BF monitors the link and automatically selects the 10Base-T operating mode – even  
though the remote link partner does not support auto-negotiation. This process, called parallel detection, is  
automatic and transparent to the remote link partner and allows the ICS1893BF to function seamlessly with  
existing legacy network structures without any management intervention.  
(For an overview of the auto-negotiation process, see Section 4.4, “Auto-Negotiation Operations”.)  
6.2.1 Auto-Negotiation General Process  
The Auto-Negotiation sublayer uses a physical signaling technique that is transparent at the packet level  
and all higher protocol levels. This technique builds on the link pulse mechanism employed in 10Base-T  
operations and is fully compliant with clause 28 of the ISO/IEC 8802-3 standard.  
During the auto-negotiation process, both the ICS1893BF and its remote link partner use Fast Link Pulses  
(FLPs) to simultaneously ‘advertise’ (that is, exchange) information on their respective technology  
capabilities as follows:  
1. For the auto-negotiation process to take place, both the ICS1893BF and its remote link partner must  
first both support and be enabled for Auto-Negotiation.  
2. The ICS1893BF obtains the data for its FLP bursts from the Auto-Negotiation Advertisement Register  
(Register 4).  
3. Both the ICS1893BF and the remote link partner substitute Fast Link Pulse (FLP) bursts in place of the  
Normal Link Pulses (NLPs). In each FLP burst, the ICS1893BF transmits information on its technology  
capability through its Link Control Word, which includes link configuration and status data.  
4. Similarly, the ICS1893BF places the Auto-Negotiation data received from its remote link partner's FLP  
bursts into the Auto-Negotiation Link Partner Ability Register (Register 5).  
5. After the ICS1893BF and its remote link partner exchange technology capability information, the  
ICS1893BF Auto-Negotiation sublayer contrasts the data in Registers 4 and 5 and automatically  
selects for the operating mode the highest-priority technology that both Register 4 and 5 have in  
common. (That is, both the ICS1893BF and its remote link partner use a predetermined priority list for  
selecting the operating mode, thereby ensuring that both sides of the link make the same selection.) As  
follows from Annex 28B of the ISO/IEC 8802-3 standard, the pre-determined technology priorities are  
listed from 1 (highest priority) to 5 (lowest priority):  
(1) 100Base-TX full duplex  
(2) 100Base-T4. (The ICS1893BF does not support this technology.)  
(3) 100Base-TX (half duplex)  
(4) 10Base-T full duplex  
(5) 10Base-T (half duplex)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
33  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
6. To indicate that the auto-negotiation process is complete, the ICS1893BF sets bits 1.5 and 17.4 high to  
logic one. After successful completion of the auto-negotiation process, the ICS1893BF  
Auto-Negotiation sublayer performs the following steps:  
a. It sets to logic one the Status Register’s Auto-Negotiation Complete bit (bit 1.5, which is also  
available in the QuickPoll register as bit 17.4).  
b. It enables the negotiated link technology (such as the 100Base Transmit modules and 100Base  
Receive modules).  
c. It disables the unused technologies to reduce the overall power consumption.  
6.2.2 Auto-Negotiation: Parallel Detection  
The ICS1893BF supports parallel detection. It is therefore compatible with networks that do not support the  
auto-negotiation process. When enabled, the Auto-Negotiation sublayer can detect legacy 10Base-T link  
partners as well as 100Base-TX link partners that do not have an auto-negotiation capability.  
The Auto-Negotiation sublayer performs this parallel detection function when it does not get a response to  
its FLP bursts. In these situations, the Auto-Negotiation sublayer performs the following steps:  
1. It sets the LP_AutoNeg_Able bit (bit 6.0) to logic zero, thereby identifying the remote link partner as not  
being capable of executing the auto-negotiation process.  
2. It sets the bit in the Auto-Negotiation Link Partner Abilities Register that corresponds to the 'parallel  
detected' technology [for example, half-duplex, 10Base-T (bit 5.5) or half-duplex, 100Base-TX (bit  
5.7)].  
3. It sets the Status Register’s Auto-Negotiation Complete bit (bit 1.5) to logic one, indicating completion  
of the auto-negotiation process.  
4. It enables the detected link technology and disables the unused technologies.  
A remote link partner that does not support the auto-negotiation process does not respond to the  
transmitted FLP bursts. The ICS1893BF detects this situation and responds according to the data it  
receives. The ICS1893BF can receive one of five potential responses to the FLP bursts it is transmitting:  
FLP bursts, 10Base-T link pulses (that is, Normal Link Pulses), scrambled 100Base IDLEs, nothing, or a  
combination of signal types.  
A 10Base-T link partner transmits only Normal Link Pulses when idle. When the ICS1893BF receives  
Normal Link Pulses, it concludes that the remote link partner is a device that can use only 10Base-T  
technology. A 100Base-TX node without an Auto-Negotiation sublayer transmits 100M scrambled IDLE  
symbols in response to the FLP bursts. Upon receipt of the scrambled IDLEs, the ICS1893BF concludes  
that its remote link partner is a 100Base-TX node that does not support the auto-negotiation process. For  
both 10Base-T and 100Base-TX nodes without an Auto-Negotiation sublayer, the ICS1893BF clears bit 6.0  
to logic zero, indicating that the link partner cannot perform the auto-negotiation process.  
If the remote link partner responds to the FLP bursts with FLP bursts, then the link partner is a 100Base-TX  
node that can support the auto-negotiation process. In this case, the ICS1893BF sets to logic one the  
Auto-Negotiation Expansion Register’s Link Partner Auto-Negotiation Ability bit (bit 6.0).  
If the Auto-Negotiation sublayer does not receive any signal when monitoring the receive channel, then the  
QuickPoll Detailed Status Register’s Signal Detect bit (bit 17.3) is set to logic one, indicating that no signal  
is present.  
Another possibility is that the ICS1893BF senses that it is receiving multiple technology indications. In this  
situation, the ICS1893BF cannot determine which technology to enable. It informs the STA of this problem  
by setting to logic one the Auto-Negotiation Expansion Register’s Parallel Detection Fault bit (bit 6.4).  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
34  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
6.2.3 Auto-Negotiation: Remote Fault Signaling  
If the remote link partner detects a fault, the ICS1893BF reports the remotely detected fault to the STA by  
setting to logic one the Remote Fault Detected bit(s), 1.4, 5.13, 17.1, and 19.13. In general, the reception  
of a remote fault means that the remote link partner has a problem with the integrity of its receive channel.  
Similarly, if the ICS1893BF detects a link fault, it transmits a remote fault-detected condition to its remote  
link partner. In this situation, the ICS1893BF sets to logic one the Auto-Negotiation Link Partner Ability  
Register’s Remote Fault Indication bit (bit 4.13).  
For details, see Section 7.14.3, “Remote Fault (bit 19.13)” and Section 7.3.9, “Remote Fault (bit 1.4)”.  
6.2.4 Auto-Negotiation: Reset and Restart  
If enabled, execution of the ICS1893BF auto-negotiation process occurs at power-up and upon  
management request. There are two primary ways to begin the Auto-Negotiation state machine:  
• ICS1893BF reset  
• Auto-Negotiation Restart  
6.2.4.1 Auto-Negotiation Reset  
During a reset, the ICS1893BF initializes its Auto-Negotiation sublayer modules to their default states.  
(That is, the Auto-Negotiation Arbitration State Machine and the Auto-Negotiation Progress Monitor reset to  
their idle states.) In addition, the Auto-Negotiation Progress Monitor status bits are all set to logic zero. This  
action occurs for any type of reset (hardware reset, software reset, or power-on reset).  
6.2.4.2 Auto-Negotiation Restart  
As with a reset, during an Auto-Negotiation restart, the ICS1893BF initializes the Auto-Negotiation  
Arbitration State Machine and the Auto-Negotiation Progress Monitor modules to their default states.  
However, during an Auto-Negotiation Restart, the Auto-Negotiation Progress Monitor status bits maintain  
their current state. Only three events can alter the state of the Auto-Negotiation Progress Monitor status  
bits after a Restart: (1) an STA read operation, (2) a reset, or (3) the Auto-Negotiation Arbitration State  
Machine progressing to a higher state or value.  
The Auto-Negotiation Progress Monitor Status bits change only if they are progressing to a state with a  
value greater than their current state (that is, a state with a higher logical value than that of their current  
state). For a detailed explanation of these bits and their operation, see Section 6.2.5, “Auto-Negotiation:  
Progress Monitor”.  
After the Auto-Negotiation Arbitration State Machine reaches its final state (which is Auto-Negotiation  
Complete), only an STA read of the QuickPoll Detailed Status Register or an ICS1893BF reset can alter  
these status bits.  
Any of the following situations initiates a restart of the ICS1893BF Auto-Negotiation sublayer:  
• A link failure  
• In software mode:  
– Writing a logic one to the Control Register’s Restart Auto-Negotiation bit (bit 0.9), which is a self-  
clearing bit.  
– Toggling the Control Register’s Auto-Negotiation Enable bit (bit 0.12) from a logic one to a logic zero,  
and back to a logic one.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
35  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
6.2.5 Auto-Negotiation: Progress Monitor  
Under typical circumstances, the Auto-Negotiation sublayer can establish a connection with the  
ICS1893BF’s remote link partner. However, some situations can prevent the auto-negotiation process from  
properly achieving this goal. For these situations, the ICS1893BF has an Auto-Negotiation Progress  
Monitor to provide detailed status information to its Station Management (STA) entity. With this status  
information, the STA can diagnose the failure mechanism and – in some situations – establish the link by  
correcting the problem.  
When enabled, the auto-negotiation process typically requires less than 500 ms to execute, independent of  
the link partner's ability to perform the auto-negotiation process. Typically, an STA polls both the  
Auto-Negotiation Complete bit (bit 1.5) and the Link Status bit (bit 1.2) to determine when a link is  
successfully established, either through auto-negotiation or parallel detection. The STA can then poll the  
Auto-Negotiation Link Partner Ability Register and determine the highest-performance operating mode in  
common with the capabilities it is advertising.  
6.3 Functional Block: 100Base-X PCS and PMA Sublayers  
The ICS1893BF is fully compliant with clause 24 of the ISO/IEC specification, which defines the 100Base-X  
Physical Coding sublayer (PCS) and Physical Medium Attachment (PMA) sublayers.  
6.3.1 PCS Sublayer  
The ICS1893BF 100Base-X PCS sublayer provides two interfaces: one to a MAC and the other to the  
ICS1893BF PMA sublayer. An ICS1893’s PCS sublayer performs the transmit, receive, and control  
functions and consists of the following:  
• PCS Transmit sublayer, which provides the following:  
– Parallel-to-serial conversion  
– 4B/5B encoding  
– Collision detection  
• PCS Receive sublayer, which provides the following:  
– Serial-to-parallel conversion  
– 4B/5B encoding  
– Carrier detection  
– Code group framing  
• PCS control functions, which provide:  
– Assertion of the CRS (carrier sense) signal  
– Assertion of the COL (collision detection) signal  
6.3.2 PMA Sublayer  
The ICS1893BF 100Base-X PMA Sublayer consists of two interfaces: one to the Physical Coding sublayer  
and the other to the Physical Medium Dependent sublayer. Functionally, the PMA sublayer is responsible  
for the following:  
• Link Monitoring  
• Carrier Detection  
• NRZI encoding/decoding  
• Transmit Clock Synthesis  
• Receive Clock Recovery  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
36  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
6.3.3 PCS/PMA Transmit Modules  
Both the PCS and PMA sublayers have Transmit modules.  
6.3.3.1 PCS Transmit Module  
The ICS1893BF PCS Transmit module accepts nibbles from the MAC Interface and converts the nibbles  
into 5-bit ‘code groups’ (referred to here as ‘symbols’). In addition, the PCS Transmit module performs a  
parallel-to-serial conversion on the symbols, and subsequently passes the resulting serial bit stream to the  
PMA sublayer.  
The first 16 nibbles of each MAC Frame represent the Frame Preamble. The PCS replaces the first two  
nibbles of the Frame Preamble with the Start-of-Stream Delimiter (SSD), that is, the symbols /J/K/. After  
receipt of the last Frame nibble, detected when TX_EN = FALSE, the PCS appends to the end of the Frame  
an End-of-Stream Delimiter (ESD), that is, the symbols /T/R/. (The ICS1893BF PCS does not alter any  
other data included within the Frame.)  
The PCS Transmit module also performs collision detection. In compliance with the ISO/IEC specification,  
when the transmission and reception of data occur simultaneously and the ICS1893BF is in:  
• Half-duplex mode, the ICS1893BF asserts the collision detection signal (COL).  
• Full-duplex mode, COL is always FALSE.  
6.3.3.2 PMA Transmit Module  
The ICS1893BF PMA Transmit module accepts a serial bit stream from its PCS and converts the data into  
NRZI format. Subsequently, the PMA passes the NRZI bit stream to the Twisted-Pair Physical Medium  
Dependent (TP-PMD) sublayer.  
The ICS1893BF PMA Transmit module uses a digital PLL to synthesize a transmit clock from the Clock  
Reference Interface.  
6.3.4 PCS/PMA Receive Modules  
Both the PCS and PMA sublayers have Receive modules.  
6.3.4.1 PCS Receive Module  
The ICS1893BF PCS Receive module accepts both a serial bit stream and a clock signal from the PMA  
sublayer. The PCS Receive module converts the bit stream from a serial format to a parallel format and  
then processes the data to detect the presence of a carrier.  
When a link is in the idle state, the PCS Receive module receives IDLE symbols. (All bits are logic one.)  
Upon receiving two non-contiguous zeros in the bit stream, the PCS Receive module examines the  
ensuing bits and attempts to locate the Start-of-Stream Delimiter (SSD), that is, the /J/K/ symbols.  
Upon verification of a valid SSD, the PCS Receive module substitutes the first two standard nibbles of a  
Frame Preamble for the detected SSD. In addition, the PCS Receive module uses the SSD to begin  
framing the ensuing data into 5-bit code symbols. The final PCS Receive module performs 4B/5B decoding  
on the symbols and then synchronously passes the resulting nibbles to the MAC Interface.  
The Receive state machine continues to accept PMA data, convert it from serial to parallel format, frame it,  
decode it, and pass it to the MAC Interface. During this time, the Receive state machine alternates between  
Receive and Data States. It continues this process until detecting one of the following:  
• An End-of-Stream Delimiter (ESD, that is, the /T/R/ symbols)  
• An error  
• A premature end (IDLEs)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
37  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
Upon receipt of an ESD, the Receive state machine returns to the IDLE state without passing the ESD to  
the MAC Interface. Detection of an error forces the Receive state machine to assert the receive error signal  
(RX_ER) and wait for the next symbol. If the ICS1893BF Receive state machine detects a premature end,  
it forces the assertion of the RX_ER signal, sets the Premature End bit (bit 17.5) to logic one, and  
transitions to the IDLE State.  
6.3.4.2 PMA Receive Modules  
The ICS1893BF has a PMA Receive module that provides the following functions:  
• NRZI Decoding  
The Receive module performs the NRZI decoding on the serial bit stream received from the Twisted-Pair  
Physical Medium Dependent (TP-PMD) sublayer. It converts the bit stream to a unipolar, positive, binary  
format that the PMA subsequently passes to the PCS.  
• Receive Clock Recovery  
The Receive Clock Recovery function consists of a phase-locked loop (PLL) that operates on the serial  
data stream received from the PMD sublayer. This PLL automatically synchronizes itself to the clock  
encoded in the serial data stream and then provides both a recovered clock and data stream to the PCS.  
• Link Monitoring  
– The ICS1893BF’s PMA Link Monitoring function observes the Receive Clock PLL. If the Receive  
Clock PLL cannot acquire ‘lock’ on the serial data stream, it asserts an error signal. The status of this  
error signal can be read in the QuickPoll Detailed Status Register’s PLL Lock Error bit (bit 17.9). This  
bit is a latching high (LH) bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
– In addition, the ICS1893BF’s PMA Link Monitor function continually audits the state of the connection  
with the remote link partner. It asserts a receive channel error if a receive signal is not detected or if  
a PLL Lock Error occurs. These errors, in turn, generate a link fault and force the link monitor  
function to clear both the Status Register’s Link Status bit (bit 1.2) and the QuickPoll Detailed Status  
Register’s Link Status bit (bit 17.0).  
6.3.5 PCS Control Signal Generation  
For the PCS sublayer, there are two control signals: a Carrier Sense signal (CRS) and a Collision Detect  
signal (COL).  
The CRS control signals is generated as follows:  
1. When a logic zero is detected in an idle bit stream, the Receive Functions examines the ensuing bits.  
2. When the Receive Functions find the first two non-contiguous zero bits, the Receive state machine  
moves into the Carrier Detect state.  
3. As a result, the Boolean Receiving variable is set to TRUE.  
4. Consequently, the Carrier Sense state machine moves into the Carrier Sense ‘on’ state, which asserts  
the CRS signal.  
5. If the PCS Functions:  
a. Cannot confirm either the /I/J/ (IDLE, J) symbols or the /J/K/ symbols, the receive error signal  
(RX_ER) is asserted, and the Receive state machine returns to the IDLE state. In IDLE, the  
Boolean Receiving variable is set to FALSE, thereby causing the Carrier Sense state machine to  
set the CRS signal to FALSE.  
b. Can confirm the /I/J/K/ symbols, then the Receive state machine transitions to the ‘Receive’ state.  
The COL control signal is generated by the transmit modules. For details, see Section 6.3.3.1, “PCS  
Transmit Module”.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
38  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
6.3.6 4B/5B Encoding/Decoding  
The 4B/5B encoding methodology maps each 4-bit nibble to a 5-bit symbol (also called a “code group”).  
There are 32 five-bit symbols, which include the following:  
• Of the 32 five-bit symbols, 16 five-bit symbols are required to represent the 4-bit nibbles.  
• The remaining 16 five-bit symbols are available for control functions. The IEEE Standard defines 6  
symbols for control, and the remaining 10 symbols of this grouping are invalid. The 6 control symbols  
include the following:  
– /H/, which represents a Halt, also used to signify a Transmit Error  
– /I/, which represents an IDLE  
– /J/, which represents the first symbol of the Start-of-Stream Delimiter (SSD)  
– /K/, which represents the second symbol of the Start-of-Stream Delimiter (SSD)  
– /T/, which represents the first symbol of the End-of-Stream Delimiter (ESD)  
– /R/, which represents the second symbol of the End-of-Stream Delimiter (ESD)  
If the ICS1893BF PCS receives:  
– One of the 10 undefined symbols, it sets its QuickPoll Detailed Status Register’s Invalid Symbol bit  
(bit 17.7) to logic one.  
– A Halt symbol, it sets the Halt Symbol Detected bit in its QuickPoll Detailed Status Register (bit 17.6)  
to logic one.  
Note: An STA can force the ICS1893BF to transmit symbols that are typically classified as invalid, by  
both (1) setting the Extended Control Register’s Transmit Invalid Codes bit (bit 16.2) to logic one  
and (2) asserting the associated TXER signal. For more information, see Section 7.11.7, “Invalid  
Error Code Test (bit 16.2)”.  
6.4 Functional Block: 100Base-TX TP-PMD Operations  
The ICS1893BF supports both 10Base-T and 100Base-TX operations. For 100Base-TX operations, the  
TP-PMD module performs stream-cipher scrambling/descrambling and MLT-3 encoding/decoding (3-level,  
multi-level transition) in compliance with the ANSI Standard X3.263: 199X FDDI TP-PMD as defined in the  
specification for 100Base-TX Twisted-Pair Physical Media Dependent (TP-PMD) Sublayer. The  
ICS1893BF’s TP-PMD also performs DC restoration (that is, baseline wander correction) and adaptive  
equalization on the received signals.  
Note:  
1. For an overview of 100Base-TX operations, see Section 4.5, “100Base-TX Operations”.  
2. For more information on the Twisted-Pair Interface, see Section 5.3, “Twisted-Pair Interface”.  
6.4.1 100Base-TX Operation: Stream Cipher Scrambler/Descrambler  
When the ICS1893BF is operating in 100Base-TX mode, it employs a stream cipher  
scrambler/descrambler that complies with the ANSI Standard X3.263: 199X FDDI TP-PMD. The purpose of  
the stream cipher scrambler is to spread the transmission spectrum to minimize electromagnetic  
compatibility problems. The stream cipher descrambler restores the received serial bit stream to its  
unscrambled form.  
The ICS1893BF “seeds” (that is, initializes) the Transmit Stream Cipher Shift register by using the  
ICS1893BF PHY address from Table 7-16, which minimizes crosstalk and noise in repeater applications.  
The MAC Interface bypasses the stream cipher scrambler/descrambler when in the 100M Symbol Interface  
mode.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
39  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
6.4.2 100Base-TX Operation: MLT-3 Encoder/Decoder  
When operating in the 100Base-TX mode, the ICS1893BF TP-PMD sublayer employs an MLT-3 encoder  
and decoder. During data transmission, the TP-PMD encoder converts the NRZI bit stream received from  
the PMA sublayer to a 3-level Multi-Level Transition code. The three levels are -1, 0, and +1. The results of  
MLT-3 encoding provide a reduction in the transmitted energy over the critical frequency range from 20  
MHz to 100 MHz. The TP-PMD MLT-3 decoder converts the received three-level signal back to an NRZI bit  
stream.  
6.4.3 100Base-TX Operation: DC Restoration  
The ICS1893BF’s 100Base-TX operations uses a stream-cipher scrambler to minimize peak amplitudes in  
the frequency spectrum. However, the nature of the stream cipher and MLT-3 encoding is such that long  
sequences of consecutive zeros or ones can exist. These unbalanced data patterns produce an  
undesirable DC component in the data stream known as ‘baseline wander’.  
Baseline wander adversely affects the noise immunity of the receiver, because the ‘baseline’ signal moves  
or ‘wanders’ from its nominal DC value. The ICS1893BF uses a unique technique to restore the DC  
component ‘lost’ by the medium. As a result, the design is very robust, immune to noise and independent  
of the data stream.  
6.4.4 100Base-TX Operation: Adaptive Equalizer  
The ICS1893BF has a TP-PMD sublayer that uses adaptive equalization circuitry to compensate for signal  
amplitude and phase distortion incurred from the transmission medium. At a data rate of 100 Mbps, the  
transmission medium (that is, the cable) introduces significant signal distortion because of high-frequency  
attenuation and phase shift. The high-frequency loss occurs primarily because of the cable skin effect that  
causes the conductor resistance to rise as the square of the frequency rises.  
The ICS1893BF has an adaptive equalizer that accurately compensates for these losses in shielded  
twisted-pair (STP) and unshielded twisted-pair (UTP) cables. The DSP-based adaptive equalizer uses a  
technique that compensates for a wide range of cable lengths. The optimizing parameter for the  
equalization process is the overall bit error rate of the ICS1893BF. This technique closes the loop on the  
entire data reception process and provides a very high overall reliability.  
6.4.5 100Base-TX Operation: Twisted-Pair Transmitter  
The ICS1893BF uses the same Twisted-Pair Transmit pins (TP_TXP and TP_TXN) for both 10Base-T and  
100Base-TX operations. Each twisted-pair transmitter module is a current-driven, differential driver that can  
supply either of the following:  
• A two-level 10Base-T (that is, Manchester-encoded) signal  
• A three-level 100Base-TX (that is, MLT-3 encoded) signal  
The ICS1893BF interfaces with the medium through an isolation transformer (sometimes referred to as a  
magnetic module). The ICS1893BF’s transmitter uses wave-shaping techniques to control the output  
signal rise and fall times (thereby eliminating the need for external filters) and interfaces directly to the  
isolation transformer.  
Note:  
1. In reference to the ICS1893BF, the term ‘Twisted-Pair Transmitter’ refers to the set of Twisted-Pair  
Transmit output pins (TP_TXP and TP_TXN).  
2. For information on the 10Base-T Twisted-Pair Transmitter, see Section 6.5.11, “10Base-T Operation:  
Twisted-Pair Transmitter”.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
40  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
6.4.6 100Base-TX Operation: Twisted-Pair Receiver  
The ICS1893BF uses the same Twisted-Pair Receive pins (TP_RXP and TP_RXN) for both 10Base-T and  
100Base-TX operations. The internal twisted-pair receiver modules interface with the medium through an  
isolation transformer. The 100Base-TX receiver module accepts and processes a differential three-level  
100Base-TX (that is, MLT-3 encoded) signal from the isolation transformer. (In contrast, the 10Base-T  
receiver module accepts and processes a differential two-level, Manchester- encoded, 10Base-T signal  
from the isolation transformer).  
Note:  
1. In reference to the ICS1893BF, the term ‘Twisted-Pair Receiver’ refers to the set of Twisted-Pair  
Receive output pins (TP_RXP and TP_RXN).  
2. For information on the 10Base-T Twisted-Pair Receiver, see Section 6.5.12, “10Base-T Operation:  
Twisted-Pair Receiver”.  
6.4.7 100Base-TX Operation: Isolation Transformer  
The ICS1893BF interfaces with a medium through isolation transformers. The PHY requires two isolation  
transformers: one for its Twisted-Pair Transmitter and the other for its Twisted-Pair Receiver. These  
isolation transformers provide both physical isolation as well as the means for coupling a signal between  
the ICS1893BF and the medium for both 10Base-T and 100Base-TX operations.  
Note: For information on isolation transformers (also referred to as magnetic modules), see Section 5.3,  
“Twisted-Pair Interface”.  
6.5 Functional Block: 10Base-T Operations  
When configured for 10Base-T mode, the ICS1893BF MAC Interface is configured to provide 10M MII  
(Media Independent Interface). The Twisted-Pair Interface is automatically configured to provide a  
two-level, Manchester-encoded signal at the voltage levels specified in the ISO/IEC standard. (For more  
information on the Twisted-Pair Interface, see Section 5.3, “Twisted-Pair Interface”.)  
The 10Base-T and 100Base-TX operations differ as follows. 10Base-T operations are fundamentally  
simpler than 100Base-TX operations. The data rate is slower, requiring less encoding than 100Base-TX  
operations. In addition, the bandwidth requirements (and therefore the line attenuation issues) are not as  
severe as with 100-MHz operations. Consequently, when an ICS1893BF is set for 10Base-T operations, it  
requires fewer internal circuits in contrast to 100Base-TX operations. (For an overview of 10Base-T  
operations, see Section 4.6, “10Base-T Operations”.).  
6.5.1 10Base-T Operation: Manchester Encoder/Decoder  
During data transmission the ICS1893BF acquires data from its MAC Interface in 4-bit nibbles. The  
ICS1893BF converts this data into a Manchester-encoded signal for presentation to its MDI, as required by  
the ISO/IEC specification.  
In a Manchester-encoded signal, all logic:  
• Ones are:  
– Positive during the first half of the bit period  
– Negative during the second half of the bit period  
• Zeros are:  
– Negative during the first half of the bit period  
– Positive during the second half of the bit period  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
41  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
During 10Base-T data reception, a Manchester Decoder translates the serial bit stream obtained from the  
Twisted-Pair Receiver (MDI) into an NRZ bit stream. The Manchester Decoder then passes the data to the  
MAC Interface in parallel format.  
Manchester-encoded signals have the following advantages:  
• Every bit period has an encoded clock.  
• The split-phase nature of the signal always provides a zero DC level regardless of the data (that is, there  
is no baseline wander phenomenon).  
The primary disadvantage in using Manchester-encoded signals is that it doubles the data rate, making it  
operationally prohibitive for 100-MHz operations.  
6.5.2 10Base-T Operation: Clock Synthesis  
The ICS1893BF synthesizes the clocks required for synchronizing data transmission. In 10Base-T mode,  
the MAC Interface provides a 10M MII (Media Independent Interface):  
• 10M MII interface, the ICS1893BF synthesizes a 2.5-MHz clock for nibble-wide transactions  
6.5.3 10Base-T Operation: Clock Recovery  
The ICS1893BF recovers its receive clock from the Manchester-encoded data stream obtained from its  
Twisted-Pair Receiver using a phase-locked loop (PLL). The ICS1893BF then uses this recovered clock for  
synchronizing data transmission between itself and the MAC. Receive-clock PLL acquisitions begin with  
reception of the MAC Frame Preamble and continue as long as the ICS1893BF is receiving data.  
6.5.4 10Base-T Operation: Idle  
An ICS1893BF transmits Normal Link Pulses on its MDI in the absence of data. During this time the link is  
Idle, and the ICS1893BF periodically transmits link pulses at a rate of one link pulse every 16 ms in  
compliance with the ISO/IEC 8802-3 standard. In 10Base-T mode, the ICS1893BF continues transmitting link  
pulses even while receiving data. This situation does not generate a Collision Detect signal (COL) because  
link pulses indicate an idle state for a link.  
6.5.5 10Base-T Operation: Link Monitor  
When an ICS1893BF is in 10Base-T mode, its Link Monitor Function observes the data received by the  
10Base-T Twisted-Pair Receiver to determine the link status. The results of this continual monitoring are  
stored in the Link Status bit. The Station Management entity (STA) can access the Link Status bit in either  
the Status Register (bit 1.2) or the QuickPoll Detailed Status Register (bit 17.0).  
When the Link Status bit is:  
• Zero, either a valid link is not established or the link is momentarily dropped since either the last read of  
the Link Status bit or the last reset of the ICS1893BF.  
• One, a valid link is established.  
The ICS1893BF Link Status bit is a latching low (LL) bit. (For more information on latching high and latching  
low bits, see Section 7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
The criteria used by the Link Monitor Function to declare a link either valid or invalid depends upon these  
factors: the present state of the link, whether its Smart Squelch function is enabled, and the incoming data.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
42  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
When the 10Base-T link is:  
• Invalid, and the Smart Squelch function is:  
– Disabled (bit 18.0 is logic one), the Link Monitor Function must detect at least one of the following  
events before transitioning its link from the invalid state to the valid state:  
• More than seven, ISO/IEC-defined, Normal Link Pulses (NLPs)  
• Any valid data  
– Enabled (bit 18.0 is logic zero), the Link Monitor Function must detect at least one of the following  
events before transitioning its link from the invalid state to the valid state:  
• More than seven, ISO/IEC-defined, Normal Link Pulses (NLPs)  
• Any valid data followed by a valid IDL  
• Valid, and the Smart Squelch function is:  
– Disabled (bit 18.0 is logic one), the Link Monitor Function continues to report its link as valid as long  
as it continues to detect any of the following:  
• ISO/IEC-defined, Normal Link Pulses (NLPs)  
• Any valid data  
– Enabled (bit 18.0 is logic zero), the Link Monitor Function continues to report its link as valid as long  
as it continues to detect any of the following:  
• ISO/IEC-defined, Normal Link Pulses (NLPs)  
• Any valid data followed by a valid IDL  
• Valid, the Link Monitor Function declares the link as invalid if it receives neither data nor NLPs (that is,  
the link shows either no activity or inconsistent activity) for more than 81 to 83 ms. In this case the Link  
Monitor Function sets the Link Status bit to logic zero.  
Note:  
1. An ICS1893BF receives ‘valid data’ when its Twisted-Pair Receiver phase-locked loop can acquire lock  
and extract the receive clock from the incoming data stream for a minimum of three consecutive bit  
times.  
2. When a link is invalid and the Link Monitor Function detects the presence of data, the ICS1893BF does  
not transition the link to the valid state until after the reception of the present packet is complete.  
3. Enabling or disabling the Smart Squelch Function affects the Link Monitor function.  
4. A transition from the invalid state to the valid state does not automatically update the latching-low Link  
Status bit.  
6.5.6 10Base-T Operation: Smart Squelch  
The Smart Squelch Function imposes more stringent requirements on the Link Monitor Function regarding  
the definition of a valid link, thereby providing a level of insurance that spurious noise is not mistaken for a  
valid link during cable installation.  
An STA can control the execution of the ICS1893BF Smart Squelch Function using bit 18.0 (the Smart  
Squelch Inhibit bit in the 10Base-T Operations Register). When bit 18.0 is logic:  
• Zero (the default), an ICS1893BF enables its Smart Squelch Function. In this case, the Link Monitor  
must confirm the presence of both data and a valid IDL at the end of the packet before declaring a link  
valid.  
• One, an ICS1893BF disables or inhibits its Smart Squelch Function. In this case, the Link Monitor does  
not have to confirm the presence of an IDL to declare a link valid (that is, the reception of any data is  
sufficient).  
In 10Base-T mode, an ICS1893BF appends an IDL to the end of each packet during data transmission.  
The receiving PHY (the remote link partner) sees this IDL and removes it from the data stream.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
43  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
6.5.7 10Base-T Operation: Carrier Detection  
The ICS1893BF has a 10Base-T Carrier Detection Function that establishes the state of its Carrier Sense  
signal (CRS), based upon the state of its Transmit and Receive state machines. These functions indicate  
whether the ICS1893BF is (1) transmitting data, (2) receiving data, or (3) in a collision state (that is, the  
ICS1893BF is both transmitting and receiving data on its twisted-pair medium, as defined in the ISO/IEC  
8802-3 standard). When the ICS1893BF is configured for:  
• Half-duplex operations, the ICS1893BF asserts its CRS signal when either transmitting or receiving data.  
• Full-duplex operations, the ICS1893BF asserts its CRS signal only when it is receiving data.  
6.5.8 10Base-T Operation: Collision Detection  
The ICS1893BF has a 10Base-T Collision Detection Function that establishes the state of its Collision  
Detection signal (COL) based upon both (1) the state of its Receiver state machine and (2) the state of its  
Transmit state machine. When the ICS1893BF is operating in:  
• Half-duplex mode, the ICS1893BF asserts its COL signal to indicate it is receiving data while  
transmission of data is also in progress.  
• Full-duplex mode, the ICS1893BF always sets its COL signal to FALSE.  
6.5.9 10Base-T Operation: Jabber  
The ICS1893BF has an ISO/IEC compliant Jabber Detection Function that, when enabled, monitors the  
data stream sent to its Twisted-Pair Transmitter to ensure that it does not exceed the 10Base-T Jabber  
activation time limit (that is, the maximum transmission time). For more information, see Section 9.5.18,  
“10Base-T: Jabber Timing”.  
When the Jabber Detection Function detects that its transmission time exceeds the maximum Jabber  
activation time limit and Jabber Detection is enabled, the ICS1893BF asserts its Collision Detect (COL)  
signal. During this ISO/IEC specified ‘jabber de-activation time’, the ICS1893BF transmit data stream is  
interrupted and prevented from reaching its Twisted-Pair Transmitter. During this time, when interrupting  
the data stream and asserting its COL signal, the ICS1893BF transmits Normal Link Pulses and sets its  
QuickPoll Detailed Status Register’s Jabber Detected bit (bit 17.2) to logic one. This bit is a latching high  
(LH) bit. (For more information on latching high and latching low bits, see Section 7.1.4.1, “Latching High  
Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
The ICS1893BF provides an STA with the ability to disable the Jabber Detection Function using the Jabber  
Inhibit bit (bit 18.5 in the 10Base-T Operations Register). Setting bit 18.5 to logic:  
• Zero (the default) enables the Jabber Detection Function.  
• One disables the Jabber Detection Function.  
6.5.10 10Base-T Operation: SQE Test  
The ICS1893BF has an ISO/IEC compliant Signal Quality Error (SQE) Test Function used exclusively for  
10Base-T operations. When enabled, the ICS1893BF performs the SQE Test at the completion of each  
transmitted packet (that is, whenever its TX_EN signal transitions from asserted to de-asserted). When the  
ICS1893BF executes its SQE Test, it asserts the COL signal to its MAC Interface for a pre-determined time  
duration (ISO/IEC specified). [For more information, see Section 9.5.17, “10Base-T: Heartbeat Timing  
(SQE)”.]  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
44  
ICS1893BF Data Sheet Rev. F - Release  
An ICS1893BF SQE Test Function is:  
Chapter 6 Functional Blocks  
• Enabled only when all the following conditions are true:  
– The ICS1893BF is in node mode.  
– The ICS1893BF is in half-duplex mode.  
– The ICS1893BF has a valid link.  
– The 10Base-T Operations Register’s SQE Test Inhibit bit (bit 18.2) is logic zero (the default).  
– The ICS1893BF TX_EN signal has transitioned from asserted (high) to de-asserted (low).  
• Disabled whenever any of the following are true:  
– The ICS1893BF is in full-duplex mode.  
– The ICS1893BF detects a link failure.  
– The ICS1893BF SQE Test Inhibit bit (bit 18.2) in the 10Base-T Operations Register is logic one. [This  
bit provides the Station Management entity (STA) with the ability to disable the SQE Test function.]  
Note:  
1. In 10Base-T mode, a bit time has a typical duration of 100 ns.  
2. The SQE Test also has the name 10Base-T Heartbeat. For details on the SQE waveforms, see Section  
9.5.17, “10Base-T: Heartbeat Timing (SQE)”.  
6.5.11 10Base-T Operation: Twisted-Pair Transmitter  
The 10Base-T Twisted-Pair Transmitter is functionally similar to the 100Base-TX Twisted-Pair Transmitter.  
The primary differences are in the data rate and signaling, as specified in the ISO/IEC specifications. For  
more information, see Section 6.4.5, “100Base-TX Operation: Twisted-Pair Transmitter”.  
6.5.12 10Base-T Operation: Twisted-Pair Receiver  
The 10Base-T Twisted-Pair Receiver is functionally similar the 100Base-TX Twisted-Pair Receiver. The  
primary differences are in the data rate and signaling, as specified in the ISO/IEC specifications. For more  
information, see Section 6.4.6, “100Base-TX Operation: Twisted-Pair Receiver”.  
6.5.13 10Base-T Operation: Auto Polarity Correction  
The ICS1893BF can sense and then automatically correct a signal polarity that is reversed on its  
Twisted-Pair Receiver inputs. A signal polarity reversal occurs when the input signals on an ICS1893BF’s  
TP_RXP and TP_RXN pins are crossed or swapped (a problem that can occur during network installation  
or wiring).  
The ICS1893BF accomplishes reversed signal polarity detection and correction by examining the signal  
polarity of the Normal Link Pulses (NLPs). In 10Base-T mode, an ICS1893BF transmits and receives NLPs  
when its link is in the Idle state. In 100Base-TX mode, an ICS1893BF transmits and receives NLPs during  
Auto-Negotiation. An STA can control this feature using the 10Base-T Operations Register bit 18.3, the  
Auto Polarity-Inhibit bit. When this bit is logic:  
• Zero, the ICS1893BF automatically senses and corrects a reversed or inverted signal polarity on its  
Twisted-Pair Receive pins (TP_RXP and TP_RXN).  
• One, the ICS1893BF disables this feature.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
45  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
When an ICS1893BF detects a reversed signal polarity on its Twisted-Pair Receiver pins and the Auto  
Polarity-Inhibit bit is also logic zero (enabled), the ICS1893BF (1) automatically corrects the data stream  
and (2) sets its Polarity Reversed bit (bit 18.14) to logic one, to indicate to the STA that this situation exists.  
Bit 18.14 is a latching high (LH) bit. (For more information on latching high and latching low bits, see  
Section 7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: The ICS1893BF will not complete the Auto-MDIX function for an inverted polarity cable. This  
is a rare event with modern manufactured cables. Full Auto-Negotiation and Auto Polarity  
Correction will complete when the Auto-MDIX function is disabled. Software control for the  
Auto-MDIX function is available in MDIO Register 19 Bits 9:8.  
6.5.14 10Base-T Operation: Isolation Transformer  
The 10Base-T Isolation Transformer operates the same as the 100Base-TX Isolation Transformer. In fact,  
in a typical ICS1893BF application they are the same unit. For more information, see Section 6.4.7,  
“100Base-TX Operation: Isolation Transformer”.  
6.6 Functional Block: Management Interface  
As part of the MAC Interface, the ICS1893BF provides a two-wire serial management interface which  
complies with the ISO/IEC 8802-3 standard MII Serial Management Interface. This interface is used to  
exchange control, status, and configuration information between a Station Management entity (STA) and  
the physical layer device (PHY). The PHY and STA exchange this data through a pre-defined set of  
management registers. The ISO/IEC standard specifies the following components of this serial  
management interface:  
• A set of registers (Section 6.6.1, “Management Register Set Summary”)  
• The frame structure (Section 6.6.2, “Management Frame Structure”)  
• The protocol  
In compliance with the ISO/IEC specification, the ICS1893BF implementation of the serial management  
interface provides a bi-directional data pin (MDIO) along with a clock (MDC) for synchronizing the  
exchange of data. These pins remain active in all ICS1893BF MAC Interface modes (that is, the 10/100  
MII, 100M Symbol, and 10M Serial interface modes).  
6.6.1 Management Register Set Summary  
The ICS1893BF implements a Management Register set that adheres to the ISO/IEC standard. This  
register set (discussed in detail in Chapter 7, “Management Register Set”) includes the mandatory ‘Basic’  
Control and Status registers and the ISO/IEC ‘Extended’ registers as well as some ICS-specific registers.  
6.6.2 Management Frame Structure  
The Serial Management Interface is a synchronous, bi-directional, two-wire, serial interface for the  
exchange of configuration, control, and status data between a PHY, such as an ICS1893BF, and an STA.  
All data transferred on an MDIO signal is synchronized by its MDC signal. The PHY and STA exchange  
data through a pre-defined register set.  
The ICS1893BF complies with the ISO/IEC defined Management Frame Structure and protocol. This  
structure supports both read and write operations. Table 6-1 summarizes the Management Frame  
Structure.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
46  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 6 Functional Blocks  
Note: The Management Frame Structure starts from and returns to an IDLE condition. However, the IDLE  
periods are not part of the Management Frame Structure.  
Table 6-1. Management Frame Structure Summary  
Frame Field  
Frame Function  
Data  
Comment  
Acronym  
PRE  
Preamble (Bit 1.6)  
Start of Frame  
Operation Code  
PHY Address (Bits 16.10:6)  
Register Address  
Turnaround  
11..11  
01  
32 ones  
2 bits  
SFD  
OP  
10/01 (read/write) 2 bits  
PHYAD  
REGAD  
TA  
AAAAA  
RRRRR  
5 bits  
5 bits  
Z0/10 (read/write) 2 bits  
DDD..DD 16 bits  
DATA  
Data  
6.6.2.1 Management Frame Preamble  
The ICS1893BF continually monitors its serial management interface for either valid data or a Management  
Frame (MF) Preamble, based upon the setting of the MF Preamble Suppression bit, 1.6. When the MF  
Preamble Suppression is disabled, an ICS1893BF waits for a MF Preamble which indicates the start of an  
STA transaction. A Management Frame Preamble is a pattern of 32 contiguous logic one bits on the MDIO  
pin, along with 32 corresponding clock cycles on the MDC pin.  
The ICS1893BF supports the Management Frame (MF) Preamble Suppression capability on its  
Management Interface, thereby providing a method to shorten the Management Frame and provide an STA  
with faster access to the Management Registers.  
The ability to process Management Frames that do not have a preamble is provided by the Management  
Frame Preamble Suppression bit, (bit 1.6 in the ICS1893BF’s Status Register). This is an ISO/IEC defined  
status bit that is intended to provide an indication of whether or not a PHY supports the MF Preamble  
Suppression feature. In order to maintain backward compatibility with the ICS1890, which did not support  
MF Preamble Suppression, the ICS1893BF MF Preamble Suppression bit is a Command Override Write  
bit which defaults to a logic zero. An STA can enable MF Preamble Suppression by writing a logic one to bit  
1.6 subsequent to a write of logic one to the Command Override bit, 16.15. For an explanation of the  
Command Override Write bits, see Section 7.1.2, “Management Register Bit Access”.  
6.6.2.2 Management Frame Start  
A valid Management Frame includes a start-of-frame delimiter, SFD, immediately following the preamble.  
The SFD bit pattern is 01b and is synchronous with two clock cycles on the MDC pin.  
6.6.2.3 Management Frame Operation Code  
A valid Management Frame includes an operation code (OP) immediately following the start-of-frame  
delimiter. There are two valid operation codes: one for reading from a management register, 10b, and one  
for writing to a management register, 01b. The ICS1893BF does not respond to the codes 00b and 11b,  
which the ISO/IEC specification defines as invalid.  
6.6.2.4 Management Frame PHY Address  
The two-wire, Serial Management Interface is specified to allow busing (that is, the sharing of the two wires  
among multiple PHYs). The Management Frame includes a 5-bit PHY Address field, PHYAD, allowing for  
32 unique addresses. An STA uniquely identifies each of the PHYs that share a single serial management  
interface by using this 5-bit PHY Address field, PHYAD.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
47  
ICS1893BF Data Sheet - Release  
Chapter 6 Functional Blocks  
Upon receiving a valid STA transaction, during a power-on or hardware reset an ICS1893BF compares the  
PHYAD field included within the management frame with the value of its PHYAD bits stored in register 16.  
(For information on the PHYAD bits, see Table 7-16.) An ICS1893BF responds to all transactions that  
match its stored address bits.  
6.6.2.5 Management Frame Register Address  
A Management Frame includes a 5-bit register address field, REGAD. This field identifies which of the 32  
Management Registers are involved in a transaction between an STA and a PHY.  
6.6.2.6 Management Frame Operational Code  
A management frame includes a 2-bit operational code field, OP. If the operation code is a:  
• Read, the REGAD field identifies the register used as the source of data returned to the STA by the  
ICS1893BF.  
• Write, the REGAD identifies the destination register that is to receive the data sent by the STA to the  
ICS1893BF.  
6.6.2.7 Management Frame Turnaround  
A valid management frame includes a turn-around field (TA), which is a 2-bit time space between the  
REGAD field and the Data field. This time allows an ICS1893BF and an STA to avoid contentions during  
read transactions. During an operation that is a:  
• Read, an ICS1893BF remains in the high-impedance state during the first bit time and subsequently  
drives its MDIO pin to logic zero for the second bit time.  
• Write, an ICS1893BF waits while the STA transmits a logic one, followed by a logic zero on its MDIO pin.  
6.6.2.8 Management Frame Data  
A valid management frame includes a 16-bit Data field for exchanging the register contents between the  
ICS1893BF and the STA. All Management Registers are 16 bits wide, matching the width of the Data field.  
During a transaction that is a:  
• Read, (OP is 10b) the ICS1893BF obtains the contents of the register identified in the REGAD field and  
returns this Data to the STA synchronously with its MDC signal.  
• Write, (OP is 01b) the ICS1893BF stores the value of the Data field in the register identified in the  
REGAD field.  
If the STA attempts to:  
• Read from a non-existent ICS1893BF register, the ICS1893BF returns logic one for all bits in the Data  
field, FFFFh.  
• Write to a non-existent ICS1893BF register, the ICS1893BF isolates the Data field of the management  
frame from every reaching the registers.  
Note: The first Data bit transmitted and received is the most-significant bit of a Management Register, bit  
X.15.  
6.6.2.9 Serial Management Interface Idle State  
The MDIO signal is in an idle state during the time between STA transactions. When the Serial  
Management Interface is in the idle state, the ICS1893BF disables (that is, tri-states) its MDIO pin, which  
enters a high-impedance state. The ISO/IEC 8802-3 standard requires that an MDIO signal be idle for at  
least one bit time between management transactions. However, the ICS1893BF does not have this  
limitation and can support a continual bit stream on its MDIO signals.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
48  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
Chapter 7 Management Register Set  
The tables in this chapter detail the functionality of the bits in the management register set. The tables  
include the register locations, the bit positions, the bit definitions, the STA Read/Write Access Types, the  
default bit values, and any special bit functions or capabilities (such as self-clearing). Following each table  
is a description of each bit. This chapter includes the following sections:  
• Section 7.1, “Introduction to Management Register Set”  
• Section 7.2, “Register 0: Control Register”  
• Section 7.3, “Register 1: Status Register”  
• Section 7.4, “Register 2: PHY Identifier Register”  
• Section 7.5, “Register 3: PHY Identifier Register”  
• Section 7.6, “Register 4: Auto-Negotiation Register”  
• Section 7.7, “Register 5: Auto-Negotiation Link Partner Ability Register”  
• Section 7.8, “Register 6: Auto-Negotiation Expansion Register”  
• Section 7.9, “Register 7: Auto-Negotiation Next Page Transmit Register”  
• Section 7.10, “Register 8: Auto-Negotiation Next Page Link Partner Ability Register”  
• Section 7.11, “Register 16: Extended Control Register”  
• Section 7.12, “Register 17: Quick Poll Detailed Status Register”  
• Section 7.13, “Register 18: 10Base-T Operations Register”  
• Section 7.14, “Register 19: Extended Control Register 2”  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
49  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.1 Introduction to Management Register Set  
This section explains in general terms the Management Register set discussed in this chapter. (For a  
summary of the Management Register set, see Section 6.6.1, “Management Register Set Summary”.)  
7.1.1 Management Register Set Outline  
This section outlines the ICS1893BF Management Register set. Table 7-1 lists the ISO/IEC-specified  
Management Register Set that the ICS1893BF implements.  
Table 7-1. ISO/IEC-Specified Management Register Set  
Register Address  
Register Name  
Basic / Extended  
Basic  
0
Control  
1
Status  
Basic  
2,3  
PHY Identifier  
Extended  
Extended  
Extended  
Extended  
Extended  
Extended  
Extended  
Extended  
4
Auto-Negotiation Advertisement  
Auto-Negotiation Link Partner Ability  
Auto-Negotiation Expansion  
5
6
7
Auto-Negotiation Next Page Transmit  
Auto-Negotiation Next Page Link Partner Ability  
Reserved by IEEE  
8
9 through 15  
16 through 31  
Vendor-Specific (IDT) Registers  
Table 7-2 lists the IDT-specific registers that the ICS1893BF implements. These registers enhance the  
performance of the ICS1893BF and provide the Station Management entity (STA) with additional control  
and status capabilities.  
Table 7-2. IDT-Specific Registers  
Register Address  
16  
Register Name  
Extended Control  
Basic / Extended  
Extended  
17  
QuickPoll Detailed Status  
10Base-T Operations  
Extended Control 2  
Reserved by IDT  
Extended  
18  
Extended  
19  
Extended  
20 through 31  
Extended  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
50  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.1.2 Management Register Bit Access  
The ICS1893BF Management Registers include one or more of the following types of bits:  
Table 7-3. Description of Management Register Bit Types  
Management  
Bit  
Description  
Register Bit Types  
Symbol  
Read-Only  
RO  
An STA can obtain the value of a RO register bit. However, it cannot  
alter the value of (that is, it cannot write to) an RO register bit. The  
ICS1893BF isolates any STA attempt to write a value to an RO bit.  
Command Override  
Write  
CW  
An STA can read a value from a CW register bit. However, write  
operations are conditional, based on the value of the Command  
Register Override bit (bit 16.15). When bit 16.15 is logic:  
• Zero (the default), the ICS1893BF isolates STA attempts to write to  
the CW bits (that is, CW bits cannot be altered when bit 16.15 is  
logic zero).  
• One, the ICS1893BF permits an STA to alter the value of the CW  
bits in the subsequent register write. (Bit 16.15 is self-clearing and  
automatically clears to zero on the subsequent write.)  
Read/Write  
R/W  
An STA can unconditionally read from or write to a R/W register bit.  
Read/Write Zero  
R/W0  
An STA can unconditionally read from a R/W0 register bit, but only a  
‘0’ value can be written to this bit.  
7.1.3 Management Register Bit Default Values  
The tables in this chapter specify for each register bit the default value, if one exists. The ICS1893BF sets  
all Management Register bits to their default values after a reset. Table 7-4 lists the valid default values for  
ICS1893BF Management Register bits.  
Table 7-4. Range of Possible Valid Default Values for ICS1893BF Register Bits  
Default Condition  
Default Value  
Indicates there is no default value for the bit  
–
0
1
Indicates the bit’s default value is logic zero  
Indicates the bit’s default value is logic one  
State of pin at reset For some bits, the default value depends on the state (that is, the logic value) of a  
particular pin at reset (that is, the logic value of a pin is latched at reset). An  
example of pins that have a default condition that depends on the state of the pin  
at reset are the PHY / LED pins (P0AC, P1CL, P2LI, P3TD, and P4RD) discussed  
in the following sections:  
• Section 5.5, “Status Interface”  
• Section 7.11, “Register 16: Extended Control Register”  
• Section 8.2.2, “Multi-Function (Multiplexed) Pins: PHY Address and LED Pins”  
Note: The ICS1893BF has a number of reserved bits throughout the Management Registers. Most of  
these bits provide enhanced test modes. The Management Register tables provide the default  
values for these bits. The STA must not change the value of these bits under any circumstance. If  
the STA inadvertently changes the default values of these reserved register bits, normal operation  
of the ICS1893BF can be affected.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
51  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.1.4 Management Register Bit Special Functions  
This section discusses the types of special functions for the Management Register bits.  
7.1.4.1 Latching High Bits  
The purpose of a latching high (LH) bit is to record an event. An LH bit records an event by monitoring an  
active-high signal and then latching this active-high signal when it triggers (that is, when the event occurs).  
A latching high bit, once set to logic one, remains set until either a reset occurs or it is read by an STA.  
Immediately following an STA read of an LH bit, the ICS1893BF latches the current state of the signal into  
the LH bit. When an STA reads an LH bit:  
• Once, the LL bit provides the STA with a history of whether or not the event has ever occurred. That is,  
this first read provides the STA with a history of the condition and latches the current state of the signal  
into the LL bit for the next read.  
• Twice in succession, the LH bit provides the STA with the current state of the monitored signal.  
7.1.4.2 Latching Low Bits  
As with latching high bits, the purpose of a latching low (LL) bit is also to record an event. An LL bit records  
an event by monitoring an active-low signal and then latching this active-low signal when it triggers (that is,  
when the event occurs).  
A latching low bit, once cleared to logic zero, remains cleared until either a reset occurs or it is read by an  
STA. Immediately following an STA read of an LL bit, the ICS1893BF latches the current state of the  
active-low signal into the LL bit. When an STA reads an LL bit:  
• Once, the LL bit provides the STA with a history of whether or not the event has ever occurred. That is,  
this first read provides the STA with a history of the condition and latches the current state of the signal  
into the LL bit for the next read.  
• Twice in succession, the LL bit provides the STA with the current state of the monitored signal.  
7.1.4.3 Latching Maximum Bits  
For the ICS1893BF, the purpose of latching maximum (LMX) bits is to track the progress of internal state  
machines. The LMX bits act in combination with other LMX bits to save the maximum collective value of a  
defined group of LMX bits, from the most-significant bit to the least-significant bit.  
For example, assume a group of LMX bits is defined as register bits 13 through 11. If these bits first have a  
value of 3o (octal) and then the state machine they are monitoring advances to state:  
• 2o, then the 2o value does not get latched.  
• 4o (or any other value greater than 3o), then in this case, the value of 4o does get latched.  
LMX bits retain their value until either a reset occurs or they are read by an STA. Immediately following an  
STA read of a defined group of LMX bits, the ICS1893BF latches the current state of the monitored state  
machine into the LMX bits. When an STA reads a group of LMX bits:  
• Once, the LMX bits provide the STA with a history of the maximum value that the state machine has  
achieved and latches the current state of the state machine into the LMX bits for the next read.  
• Twice in succession, the LMX bits provide the STA with the current state of the monitored state machine.  
7.1.4.4 Self-Clearing Bits  
Self-clearing (SC) bits automatically clear themselves to logic zero after a pre-determined amount of time  
without any further STA access. The SC bits have a default value of logic zero and are triggers to begin  
execution of a function. When the STA writes a logic one to an SC bit, the ICS1893BF begins executing the  
function assigned to that bit. After the ICS1893BF completes executing the function, it clears the bit to  
indicate that the action is complete.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
52  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.2 Register 0: Control Register  
Table 7-5 lists the bits for the Control Register, a 16-bit register used to establish the basic operating modes  
of the ICS1893BF.  
• The Control Register is accessible through the MII Management Interface.  
• Its operation is independent of the MAC Interface configuration.  
• It is fully compliant with the ISO/IEC Control Register definition.  
Note: For an explanation of acronyms used in Table 7-5, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-5. Control Register (Register 0 [0x00]  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac-  
cess  
SF  
De- Hex  
fault  
0.15 Reset  
No effect  
ICS1893BF enters Reset  
mode  
R/W  
SC  
0
3
0.14 Loopback enable  
0.13 Data rate select  
Disable Loopback mode Enable Loopback mode  
10 Mbps operation 100 Mbps operation  
R/W  
R/W  
R/W  
R/W  
R/W  
–
–
–
–
–
0
1
0.12 Auto-Negotiation enable DisableAuto-Negotiation Enable Auto-Negotiation  
1
0.11 Low-power mode  
0.10 Isolate  
Normal power mode  
No effect  
Low-power mode  
0
0/4†  
Isolate ICS1893BF from  
MII  
0/1†  
0.9  
0.8  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
0.0  
Auto-Negotiation restart No effect  
Restart Auto-Negotiation  
R/W  
R/W  
R/W  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
SC  
–
0
Duplex mode  
Collision test  
Half-duplex operation  
No effect  
Full-duplex operation  
0
Enable collision test  
–
0
0
0
IEEE reserved  
IEEE reserved  
IEEE reserved  
IEEE reserved  
IEEE reserved  
IEEE reserved  
IEEE reserved  
Always 0  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
–
0‡  
0‡  
0‡  
0‡  
0‡  
0‡  
0‡  
Always 0  
–
Always 0  
–
Always 0  
–
Always 0  
–
Always 0  
–
Always 0  
–
† Whenever the PHY address of Table 7-16:  
• Is equal to 00000 (binary), the Isolate bit 0.10 is logic one.  
• Is not equal to 00000, the Isolate bit 0.10 is logic zero.  
‡ As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value  
to all Reserved bits.  
7.2.1 Reset (bit 0.15)  
This bit controls the software reset function. Setting this bit to logic one initiates an ICS1893BF software  
reset during which all Management Registers are set to their default values and all internal state machines  
are set to their idle state. For a detailed description of the software reset process, see Section 4.1.2.3,  
“Software Reset”.  
During reset, the ICS1893BF leaves bit 0.15 set to logic one and isolates all STA management register  
accesses. However, the reset process is not complete until bit 0.15 (a Self-Clearing bit), is set to logic zero,  
which indicates the reset process is terminated.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
53  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.2.2 Loopback Enable (bit 0.14)  
This bit controls the Loopback mode for the ICS1893BF. Setting this bit to logic:  
• Zero disables the Loopback mode.  
• One enables the Loopback mode by disabling the Twisted-Pair Transmitter, the Twisted-Pair Receiver,  
and the collision detection circuitry. (The STA can override the ICS1893BF from disabling the collision  
detection circuitry in Loopback mode by writing logic one to bit 0.7.) When the ICS1893BF is in Loopback  
mode, the data presented at the MAC transmit interface is internally looped back to the MAC receive  
interface. The delay from the assertion of Transmit Data Enable (TXEN) to the assertion of Receive Data  
valid (RXDV) is less than 512 bit times.  
7.2.3 Data Rate Select (bit 0.13)  
This bit provides a means of controlling the ICS1893BF data rate. Its operation depends on the state of  
several other functions, including the HW/SW input pin and the Auto-Negotiation Enable bit (bit 0.12).  
When the ICS1893BF is configured for:  
• Hardware mode (that is, the HW/SW pin is logic zero), the ICS1893BF isolates this bit 0.13 and uses the  
10/100SEL input pin to establish the data rate for the ICS1893BF. In this Hardware mode:  
– Bit 0.13 is undefined.  
– The ICS1893BF provides a Data Rate Status bit (in the QuickPoll Detailed Status Register, bit 17.15),  
which always shows the setting of an active link.  
• Software mode (that is, the HW/SW pin is logic one), the function of bit 0.13 depends on the  
Auto-Negotiation Enable bit 0.12. When the Auto-Negotiation sublayer is:  
– Enabled, the ICS1893BF isolates bit 0.13 and relies on the results of the auto-negotiation process to  
establish the data rate.  
– Disabled, bit 0.13 determines the data rate. In this case, setting bit 0.13 to logic:  
• Zero selects 10-Mbps ICS1893BF operations.  
• One selects 100-Mbps ICS1893BF operations.  
7.2.4 Auto-Negotiation Enable (bit 0.12)  
This bit provides a means of controlling the ICS1893BF Auto-Negotiation sublayer. Its operation depends  
on the HW/SW input pin.  
When the ICS1893BF is configured for:  
• Hardware mode, (that is, the HW/SW pin is logic zero), the ICS1893BF isolates bit 0.12 and uses the  
ANSEL (Auto-Negotiation Select) input pin to determine whether to enable the Auto-Negotiation  
sublayer.  
Note: In Hardware mode, bit 0.12 is undefined.  
• Software mode, (that is, the HW/SW pin is logic one), bit 0.12 determines whether to enable the  
Auto-Negotiation sublayer. When bit 0.12 is logic:  
– Zero:  
• The ICS1893BF disables the Auto-Negotiation sublayer.  
• The ICS1893BF bit 0.13 (the Data Rate bit) and bit 0.8 (the Duplex Mode bit) determine the data  
rate and the duplex mode.  
– One:  
• The ICS1893BF enables the Auto-Negotiation sublayer.  
• The ICS1893BF isolates bit 0.13 and bit 0.8.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
54  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.2.5 Low Power Mode (bit 0.11)  
This bit provides one way to control the ICS1893BF low-power mode function. When bit 0.11 is logic:  
• Zero, there is no impact to ICS1893BF operations.  
• One, the ICS1893BF enters the low-power mode. In this case, the ICS1893BF disables all internal  
functions and drives all MAC output pins low except for those that support the MII Serial Management  
Port. In addition, the ICS1893BF internally activates the TPTRI function to tri-state the signals on the  
Twisted-Pair Transmit pins (TP_TXP and TP_TXN) and achieve additional power savings.  
Note: There are two ways the ICS1893BF can enter low-power mode. When entering low-power mode:  
• By setting bit 0.11 to logic one, the ICS1893BF maintains the value of all Management Register  
bits except the latching high (LH) and latching low (LL) status bits, which are re-initialized to their  
default values instead. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
• During a reset, the ICS1893BF sets all management register bits to their default values.  
7.2.6 Isolate (bit 0.10)  
This bit controls the ICS1893BF Isolate function. When bit 0.10 is logic:  
• Zero, there is no impact to ICS1893BF operations.  
• One, the ICS1893BF electrically isolates its data paths from the MAC Interface. The ICS1893BF places  
all MAC output signals (TXCLK, RXCLK, RXDV, RXER, RXD[3:0], COL, and CRS) in a high-impedance  
state and it isolates all MAC input signals (TXD[3:0], TXEN, and TXER). In this mode, the Serial  
Management Interface continues to operate normally (that is, bit 0.10 does not affect the Management  
Interface).  
The default value for bit 0.10 depends upon the PHY address of Table 7-16. If the PHY address:  
• Is equal to 00000b, then the default value of bit 0.10 is logic one, and the ICS1893BF isolates itself from  
the MAC Interface.  
• Is not equal to 00000b, then the default value of bit 0.10 is logic zero, and the ICS1893BF does not  
isolate its MAC Interface.  
7.2.7 Restart Auto-Negotiation (bit 0.9)  
This bit allows an STA to restart the auto-negotiation process in Software mode (that is, the HW/SW pin is  
logic one). When bit 0.12 is logic:  
• Zero, the Auto-Negotiation sublayer is disabled, and the ICS1893BF isolates any attempt by the STA to  
set bit 0.9 to logic one.  
• One (as set by an STA), the ICS1893BF restarts the auto-negotiation process. Once the auto-negotiation  
process begins, the ICS1893BF automatically sets this bit to logic zero, thereby providing the  
self-clearing feature.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
55  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.2.8 Duplex Mode (bit 0.8)  
This bit provides a means of controlling the ICS1893BF Duplex Mode. Its operation depends on several  
other functions, including the HW/SW input pin and the Auto-Negotiation Enable bit (bit 0.12). When the  
ICS1893BF is configured for:  
• Hardware mode (that is, the HW/SW pin is logic zero), the ICS1893BF isolates bit 0.8 and uses the  
DPXSEL input pin to establish the Duplex mode for the ICS1893BF. In this Hardware mode:  
– Bit 0.8 is undefined.  
– The ICS1893BF provides a Duplex Mode Status bit (in the QuickPoll Detailed Status Register, bit  
17.14), which always shows the setting of an active link.  
• Software mode (that is, the HW/SW pin is logic one), the function of bit 0.8 depends on the  
Auto-Negotiation Enable bit, 0.12. When the auto-negotiation process is:  
– Enabled, the ICS1893BF isolates bit 0.8 and relies upon the results of the auto-negotiation process  
to establish the duplex mode.  
– Disabled, bit 0.8 determines the Duplex mode. Setting bit 0.8 to logic:  
• Zero selects half-duplex operations.  
• One selects full-duplex operations. (When the ICS1893BF is operating in Loopback mode, it  
isolates bit 0.8, which has no effect on the operation of the ICS1893BF.)  
7.2.9 Collision Test (bit 0.7)  
This bit controls the ICS1893BF Collision Test function. When an STA sets bit 0.7 to logic:  
• Zero, the ICS1893BF disables the collision detection circuitry for the Collision Test function. In this case,  
the COL signal does not track the TXEN signal. (The default value for this bit is logic zero, that is,  
disabled.)  
• One, as per the ISO/IEE 8802-3 standard, clause 22.2.4.1.9, the ICS1893BF enables the collision  
detection circuitry for the Collision Test function, even if the ICS1893BF is in Loopback mode (that is, bit  
0.14 is set to 1). In this case, the Collision Test function tracks the Collision Detect signal (COL) in  
response to the TXEN signal. The ICS1893BF asserts the Collision signal (COL) within 512 bit times of  
receiving an asserted TXEN signal, and it de-asserts COL within 4 bit times of the de-assertion of the  
TXEN signal.  
7.2.10 IEEE Reserved Bits (bits 0.6:0)  
The IEEE reserves these bits for future use. When an STA:  
• Reads a reserved bit, the ICS1893BF returns a logic zero.  
• Writes to a reserved bit, it must use the default value specified in this data sheet.  
The ICS1893BF uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the  
ICS1893BF, an STA must maintain the default value of these bits. Therefore, ICS recommends that during  
any STA write operation, an STA write the default value to all reserved bits, even those bits that are Read  
Only.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
56  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.3 Register 1: Status Register  
Table 7-6 lists the Status Register bits. These 16 bits of data provide an interface between the ICS1893BF  
and an STA. There are two types of status bits: some report the capabilities of the port, and some indicate  
the state of signals used to monitor internal circuits.  
The STA accesses the Status Register using the Serial Management Interface. During a reset, the  
ICS1893BF initializes the Status Register bits to pre-defined, default values.  
Note: For an explanation of acronyms used in Table 7-5, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-6. Status Register (Register 1 [0x01])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac-  
cess  
SF  
De- Hex  
fault  
1.15 100Base-T4  
Always 0. (Not supported.) N/A  
RO  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
RO  
–
–
–
–
–
–
–
–
–
–
0
1
7
8
0
1.14 100Base-TX full duplex Mode not supported  
1.13 100Base-TX half duplex Mode not supported  
Mode supported  
Mode supported  
Mode supported  
Mode supported  
N/A  
1
1.12 10Base-T full duplex  
1.11 10Base-T half duplex  
1.10 IEEE reserved  
1.9 IEEE reserved  
Mode not supported  
Mode not supported  
Always 0  
1
1
0†  
0†  
0†  
0†  
0
Always 0  
N/A  
1.8 IEEE reserved  
Always 0  
N/A  
1.7 IEEE reserved  
Always 0  
N/A  
1.6 MF Preamble  
suppression  
PHY requires MF  
Preambles  
PHY does not require  
MF Preambles  
1.5 Auto-Negotiation  
complete  
Auto-Negotiation is in  
process, if enabled  
Auto-Negotiation is  
completed  
RO  
LH  
0
1.4 Remote fault  
No remote fault detected  
Remote fault detected  
RO  
RO  
LH  
–
0
1
1.3 Auto-Negotiation ability N/A  
Always 1: PHY has  
9
Auto-Negotiation ability  
1.2 Link status  
Link is invalid/down  
Link is valid/established  
RO  
RO  
LL  
0
0
1.1 Jabber detect  
No jabber condition  
Jabber condition  
detected  
LH  
1.0 Extended capability  
N/A  
Always 1: PHY has  
extended capabilities  
RO  
–
1
† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value  
to all Reserved bits.  
7.3.1 100Base-T4 (bit 1.15)  
The STA reads this bit to learn if the ICS1893BF can support 100Base-T4 operations. Bit 1.15 of the  
ICS1893BF is permanently set to logic zero, which informs an STA that the ICS1893BF cannot support  
100Base-T4 operations.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
57  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.3.2 100Base-TX Full Duplex (bit 1.14)  
The STA reads this bit to learn if the ICS1893BF can support 100Base-TX, full-duplex operations. The  
ISO/IEC specification requires that the ICS1893BF must set bit 1.14 to logic:  
• Zero if it cannot support 100Base-TX, full-duplex operations.  
• One if it can support 100Base-TX, full-duplex operations. (For the ICS1893BF, the default value of bit  
1.14 is logic one, in that the ICS1893BF supports 100Base-TX, full-duplex operations.)  
Bit 1.14 is a Command Override Write bit, which allows an STA to alter the default value of this bit. [See the  
description of bit 16.15, the Command Override Write Enable bit, in Section 7.11, “Register 16: Extended  
Control Register”.]  
7.3.3 100Base-TX Half Duplex (bit 1.13)  
The STA reads this bit to learn if the ICS1893BF can support 100Base-TX, half-duplex operations. The  
ISO/IEC specification requires that the ICS1893BF must set bit 1.13 to logic:  
• Zero if it cannot support 100Base-TX, half-duplex operations.  
• One if it can support 100Base-TX, half-duplex operations. (For the ICS1893BF, the default value of bit  
1.13 is logic one. Therefore, when an STA reads the Status Register, the STA is informed that the  
ICS1893BF supports 100Base-TX, half-duplex operations.)  
This bit 1.13 is a Command Override Write bit, which allows an STA to alter the default value of this bit.  
[See the description of bit 16.15, the Command Override Write Enable bit, in Section 7.11, “Register 16:  
Extended Control Register”.]  
7.3.4 10Base-T Full Duplex (bit 1.12)  
The STA reads this bit to learn if the ICS1893BF can support 10Base-T, full-duplex operations. The  
ISO/IEC specification requires that the ICS1893BF must set bit 1.12 to logic:  
• Zero if it cannot support 10Base-T, full-duplex operations.  
• One if it can support 10Base-T, full-duplex operations. (For the ICS1893BF, the default value of bit 1.12  
is logic one. Therefore, when an STA reads the Status Register, the STA is informed that the ICS1893BF  
supports 10Base-T, full-duplex operations.)  
This bit 1.12 is a Command Override Write bit, which allows an STA to alter the default value of this bit.  
[See the description of bit 16.15, the Command Override Write Enable bit, in Section 7.11, “Register 16:  
Extended Control Register”.]  
7.3.5 10Base-T Half Duplex (bit 1.11)  
The STA reads this bit to learn if the ICS1893BF can support 10Base-T, half-duplex operations. The  
ISO/IEC specification requires that the ICS1893BF must set bit 1.11 to logic:  
• Zero if it cannot support 10Base-T, half-duplex operations.  
• One if it can support 10Base-T, half-duplex operations. (For the ICS1893BF, the default value of bit 1.11  
is logic one. Therefore, when an STA reads the Status Register, the STA is informed that the ICS1893BF  
supports 10Base-T, half-duplex operations.)  
Bit 1.11 of the ICS1893BF Status Register is a Command Override Write bit., which allows an STA to alter  
the default value of this bit. [See the description of bit 16.15, the Command Override Write Enable bit, in  
Section 7.11, “Register 16: Extended Control Register”.]  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
58  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.3.6 IEEE Reserved Bits (bits 1.10:7)  
The IEEE reserves these bits for future use. When an STA:  
• Reads a reserved bit, the ICS1893BF returns a logic zero.  
• Writes a reserved bit, the STA must use the default value specified in this data sheet.  
Both the ISO/IEC standard and the ICS1893BF reserve the use of some Management Register bits. ICS  
uses some reserved bits to invoke ICS1893BF test functions. To ensure proper operation of the  
ICS1893BF, an STA must maintain the default value of these bits. Therefore, ICS recommends that an STA  
write the default value to all reserved bits during all Management Register write operations.  
Reserved bits 1.10:7 are Command Override Write (CW) bits. When bit 16.15, the Command Register  
Override bit, is logic:  
• Zero, the ICS1893BF prevents all STA writes to CW bits.  
• One, an STA can modify the value of these bits.  
7.3.7 MF Preamble Suppression (bit 1.6)  
Status Register bit 1.6 is the Management Frame (MF) Preamble Suppression bit. The ICS1893BF sets bit  
1.6 to inform the STA of its ability to receive frames that do not have a preamble. When this bit is logic:  
• Zero, the ICS1893BF is indicating it cannot accept frames with a suppressed preamble.  
• One, the ICS1893BF is indicating it can accept frames that do not have a preamble.  
Although the ICS1893BF supports Management Frame Preamble Suppression, its default value for bit 1.6  
is logic zero. This default value ensures that bit 1.6 is backward compatible with the ICS1890, which does  
not have this capability. As the means of enabling this feature, the ICS1893BF implements bit 1.6 as a  
Command Override Write bit, instead of as a Read-Only bit as in the ICS1890. An STA uses the bit 1.6 to  
enable MF Preamble Suppression in the ICS1893BF. [See the description of bit 16.15, the Command  
Override Write Enable bit, in Section 7.11, “Register 16: Extended Control Register”.]  
7.3.8 Auto-Negotiation Complete (bit 1.5)  
An STA reads bit 1.5 to determine the state of the ICS1893BF auto-negotiation process. The ICS1893BF  
sets the value of this bit using two criteria. When its Auto-Negotiation sublayer is:  
• Disabled, the ICS1893BF sets bit 1.5 to logic zero.  
• Enabled, the ICS1893BF sets bit 1.5 to a value based on the state of the Auto-Negotiation State  
Machine. In this case, it sets bit 1.5 to logic one only upon completion of the auto-negotiation process.  
This setting indicates to the STA that a link is arbitrated and the contents of Management Registers 4, 5,  
and 6 are valid. For details on the auto-negotiation process, see Section 6.2, “Functional Block:  
Auto-Negotiation”.  
Bit 1.5 is a latching high (LH) bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: An Auto-Negotiation Restart does not clear an LH bit. However, performing two consecutive reads  
of this register provides the present state of the bit.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
59  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.3.9 Remote Fault (bit 1.4)  
An STA reads bit 1.4 to determine if a Remote Fault exists. The ICS1893BF sets bit 1.4 based on the  
Remote Fault bit received from its remote link partner. The ICS1893BF receives the Remote Fault bit as  
part of the Link Code Word exchanged during the auto-negotiation process. If the ICS1893BF receives a  
Link Code Word from its remote link partner and the Remote Fault bit is set to:  
• Zero, then the ICS1893BF sets bit 1.4 to logic zero.  
• One, then the ICS1893BF sets bit 1.4 to logic one. In this case, the remote link partner is reporting the  
detection of a fault, which typically occurs when the remote link partner is having a problem with its  
receive channel.  
Bit 1.4 is a latching high status bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: The ICS1893BF has two versions of the Remote Fault bit.  
• One version of the Remote Fault bit is a latching high version. An STA can access this version  
through either Management Register 1 (bit 1.4) or 17 (bit 17.1). This bit 1.4/17.1 is cleared when  
an STA reads either of these registers. (Bit 1.4 is identical to bit 17.1 in that they are the same  
internal bit.)  
• Another version of the Remote Fault bit is updated whenever the ICS1893BF receives a new  
Link Control Word. An STA can access this version through Management Register 5 (bit 5.13),  
which like bits 1.4/17.1, also reports the status of the Remote Fault bit received from the remote  
link partner. However, bit 5.13 is not a latching high bit.  
The operation of both bit 1.4/17.1 and bit 5.13 are in compliance with the IEEE Std 802.3u.  
7.3.10 Auto-Negotiation Ability (bit 1.3)  
The STA reads bit 1.3 to determine if the ICS1893BF can support the auto-negotiation process. If the  
ICS1893BF:  
• Cannot support the auto-negotiation process, it clears bit 1.3 to logic zero.  
• Can support the auto-negotiation process, it sets bit 1.3 to logic one. (For the ICS1893BF, the default  
value of bit 1.3 is logic one.)  
7.3.11 Link Status (bit 1.2)  
The purpose of this bit 1.2 (which is also accessible through the QuickPoll Detailed Status Register, bit  
17.0) is to determine if an established link is dropped, even momentarily. To indicate a link that is:  
• Valid, the ICS1893BF sets bit 1.2 to logic one.  
• Invalid, the ICS1893BF clears bit 1.2 to logic zero.  
This bit is a latching low (LL) bit that the Link Monitor function controls. (For more information on latching  
high and latching low bits, see Section 7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low  
Bits”.) The Link Monitor function continually observes the data received by either its 10Base-T or  
100Base-TX Twisted-Pair Receivers to determine the link status and stores the results in the Link Status  
bit.  
The criterion the Link Monitor uses to determine if a link is valid or invalid depends on the following:  
• Type of link  
• Present link state (valid or invalid)  
• Presence of any link errors  
• Auto-negotiation process  
For more information on the Link Monitor Function (relative to the Link Status bit), see Section 6.5.5,  
“10Base-T Operation: Link Monitor”.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
60  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.3.12 Jabber Detect (bit 1.1)  
The purpose of this bit is to allow an STA to determine if the ICS1893BF detects a Jabber condition as  
defined in the ISO/IEC specification.The ICS1893BF Jabber Detection function is controlled by the Jabber  
Inhibit bit in the 10Base-T Operations register (bit 18.5). To detect a Jabber condition, first the ICS1893BF  
Jabber Detection function must be enabled. When bit 18.5 is logic:  
• Zero, the ICS1893BF disables Jabber Detection and sets the Jabber Detect bit to logic zero.  
• One, the ICS1893BF enables Jabber Detection and sets the Jabber Detect bit to logic one upon  
detection of a Jabber condition. When no Jabber condition is detected, the Jabber Detect bit is not  
altered.  
Note:  
1. The Jabber Detect bit is accessible through both the Status register (as bit 1.1) and the QuickPoll  
Detailed Status Register (as bit 17.2). A read of either register clears the Jabber Detect bit.  
2. The Jabber Detect bit is a latching high (LH) bit. (For more information on latching high and latching low  
bits, see Section 7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
7.3.13 Extended Capability (bit 1.0)  
The STA reads bit 1.0 to determine if the ICS1893BF has an extended register set. In the ICS1893BF this  
bit is always logic one, indicating that it has extended registers.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
61  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.4 Register 2: PHY Identifier Register  
Table 7-7 lists the bits for PHY Identifier Register (Register 2), which is one of two PHY Identifier Registers  
that are part of a set defined by the ISO/IEC specification. As a set, the PHY Identifier Registers (Registers  
2 and 3) include a unique, 32-bit PHY Identifier composed from the following:  
• Organizationally Unique Identifier (OUI), discussed in this section  
• Manufacturer’s PHY Model Number, discussed in Section 7.5, “Register 3: PHY Identifier Register”  
• Manufacturer’s PHY Revision Number, discussed in Section 7.5, “Register 3: PHY Identifier Register”  
All of the bits in the two PHY Identifier Registers are Command Override Write bits. An STA can read them  
at any time without condition. However, an STA can modify these register bits only when the Command  
Register Override bit (bit 16.15) is enabled with a logic one.  
Note: For an explanation of acronyms used in Table 7-5, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-7. PHY Identifier Register (Register 2 [0x02])  
Bit  
Definition  
When Bit = 0 When Bit = 1 Access  
Special  
Default  
Hex  
Function  
2.15  
2.14  
2.13  
2.12  
2.11  
2.10  
2.9  
OUI bit 3 | c  
OUI bit 4 | d  
OUI bit 5 | e  
OUI bit 6 | f  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
OUI bit 7 | g  
OUI bit 8 | h  
OUI bit 9 | I  
OUI bit 10 | j  
OUI bit 11 | k  
OUI bit 12 | l  
OUI bit 13 | m  
OUI bit 14 | n  
OUI bit 15 | o  
OUI bit 16 | p  
OUI bit 17 | q  
OUI bit 18 | r  
0
1
5
2.8  
2.7  
2.6  
2.5  
2.4  
2.3  
2.2  
2.1  
2.0  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
62  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
IEEE-Assigned Organizationally Unique Identifier (OUI)  
For each manufacturing organization, the IEEE assigns an 3-octet OUI. For Integrated Circuit Systems,  
Inc. the IEEE-assigned 3-octet OUI is 00A0BEh.  
The binary representation of an OUI is formed by expressing each octet as a sequence of eight bits, from  
least significant to most significant, and from left to right. Table 7-8 provides the ISO/IEC-defined mapping  
of the OUI (in IEEE Std. 802-1990 format) to Management Registers 2 and 3.  
Table 7-8. IEEE-Assigned Organizationally Unique Identifier  
First Octet  
Second Octet  
Third Octet  
0
0
0
A
E
B
a
1
b
2
c
d
4
e
5
f
g
7
h
8
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
3
6
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24  
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
1
1
1
1
0
1
0
0
1
5
F
1
2.15:12  
2.11:8  
2.7:4  
2.3:0  
3.15:12  
Register 3  
3.11:10  
Register 2  
7.5 Register 3: PHY Identifier Register  
Table 7-9 lists the bits for PHY Identifier Register (Register 3), which is one of two PHY Identifier Registers  
that are part of a set defined by the ISO/IEC specification. This register stores the following:  
• Part of the OUI [see the text in Section 7.4, “Register 2: PHY Identifier Register”]  
• Manufacturer’s PHY Model Number  
• Manufacturer’s PHY Revision Number  
All the bits in the two PHY Identifier Registers are Command Override Write bits. An STA can read them at  
any time without condition. However, An STA can modify these register bits only when the Command  
Register Override bit (bit 16.15) is enabled with a logic one.  
Note: For an explanation of acronyms used in Table 7-5, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-9. PHY Identifier Register (Register 3 [0x03])  
Bit  
Definition  
When Bit = 0 When Bit = 1 Access  
Special  
Default Hex  
Function  
3.15 OUI bit 19 | s  
3.14 OUI bit 20 | t  
3.13 OUI bit 21 | u  
3.12 OUI bit 22 | v  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
CW  
CW  
CW  
CW  
–
–
–
–
1
1
1
1
F
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
63  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
Table 7-9. PHY Identifier Register (Register 3 [0x03])  
Bit  
Definition  
When Bit = 0 When Bit = 1 Access  
Special  
Default Hex  
Function  
3.11  
OUI bit 23 | w  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
–
–
–
–
–
–
–
–
–
–
–
–
0
1
0
0
0
1
0
0
0
0
1
0
4
4
2
3.10 OUI bit 24 | x  
3.9  
3.8  
3.7  
3.6  
3.5  
3.4  
3.3  
3.2  
3.1  
3.0  
Manufacturer’s Model Number bit 5  
Manufacturer’s Model Number bit 4  
Manufacturer’s Model Number bit 3  
Manufacturer’s Model Number bit 2  
Manufacturer’s Model Number bit 1  
Manufacturer’s Model Number bit 0  
Revision Number bit 3  
Revision Number bit 2  
Revision Number bit 1  
Revision Number bit 0  
7.5.1 OUI bits 19-24 (bits 3.15:10)  
The most-significant 6 bits of register 3 (that is, bits 3.15:10) include OUI bits 19 through 24. OUI bit 19 is  
stored in bit 3.15, while OUI bit 24 is stored in bit 3.10.  
7.5.2 Manufacturer's Model Number (bits 3.9:4)  
The model number for the ICS1893BF is 4 (decimal). It is stored in bit 3.9:4 as 00100b.  
7.5.3 Revision Number (bits 3.3:0)  
Table 7-10 lists the valid ICS1893BF revision numbers, which are 4-bit binary numbers stored in bits 3.3:0.  
Table 7-10. ICS1893BF Revision Number  
Decimal  
Bits 3.3:0  
Description  
IDT 1893B Release with Auto-MDIX  
2
0010  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
64  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.6 Register 4: Auto-Negotiation Register  
Table 7-11 lists the bits for the Auto-Negotiation Register. An STA uses this register to select the  
ICS1893BF capabilities that it wants to advertise to its remote link partner. During the auto-negotiation  
process, the ICS1893BF advertises (that is, exchanges) capability data with its remote link partner by using  
a pre-defined Link Code Word. The Link Code Word is embedded in the Fast Link Pulses exchanged  
between PHYs when the ICS1893BF has its Auto-Negotiation sublayer enabled. The value of the Link  
Control Word is established based on the value of the bits in this register.  
Note: For an explanation of acronyms used in Table 7-5, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-11. Auto-Negotiation Advertisement Register (register 4 [0x04])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac-  
cess  
SF De- Hex  
fault  
4.15 Next Page  
Next page not supported  
Always 0  
Next page supported  
N/A  
R/W  
CW  
R/W  
CW  
CW  
CW  
CW  
R/W  
R/W  
R/W  
R/W  
CW  
CW  
CW  
CW  
CW  
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0
0†  
0
0
1
E
1
4.14 IEEE reserved  
4.13 Remote fault  
4.12 IEEE reserved  
4.11 IEEE reserved  
4.10 IEEE reserved  
4.9 100Base-T4  
Locally, no faults detected  
Always 0  
Local fault detected  
N/A  
0†  
0†  
0†  
0
Always 0  
N/A  
Always 0  
N/A  
Always 0. (Not supported.)  
N/A  
4.8 100Base-TX, full duplex Do not advertise ability  
4.7 100Base-TX, half duplex Do not advertise ability  
Advertise ability  
Advertise ability  
Advertise ability  
Advertise ability  
1
1
4.6 10Base-T, full duplex  
4.5 10Base-T half duplex  
4.4 Selector Field bit S4  
4.3 Selector Field bit S3  
4.2 Selector Field bit S2  
4.1 Selector Field bit S1  
4.0 Selector Field bit S0  
Do not advertise ability  
Do not advertise ability  
1
1
IEEE 802.3-specified default N/A  
IEEE 802.3-specified default N/A  
IEEE 802.3-specified default N/A  
IEEE 802.3-specified default N/A  
0
0
0
0
N/A  
IEEE 802.3-specified  
default  
1
† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value  
to all Reserved bits.  
7.6.1 Next Page (bit 4.15)  
This bit indicates whether the ICS1893BF uses the Next Page Mode functions during the auto-negotiation  
process. If bit 4.15 is logic:  
• Zero, then the ICS1893BF indicates to its remote link partner that these features are disabled. (Although  
the default value of this bit is logic zero, the ICS1893BF does support the Next Page function.)  
• One, then the ICS1893BF advertises to its remote link partner that this feature is enabled.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
65  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.6.2 IEEE Reserved Bit (bit 4.14)  
The ISO/IEC specification reserves this bit for future use. However, the ISO/IEC Standard also defines bit  
4.14 as the Acknowledge bit.  
When this reserved bit is read by an STA, the ICS1893BF returns a logic zero. However, whenever an STA  
writes to this reserved bit, it must use the default value specified in this data sheet. ICS uses some reserved  
bits to invoke auxiliary functions. To ensure proper operation of the ICS1893BF, an STA must maintain the  
default value of these bits. Therefore, ICS recommends that an STA always write the default value of any  
reserved bits during all management register write operations.  
Reserved bit 4.14 is a Command Override Write (CW) bit. Whenever bit 16.15 (the Command Register  
Override bit) is logic:  
• Zero, the ICS1893BF isolates all STA writes to bit 4.14.  
• One, an STA can modify the value of bit 4.14.  
7.6.3 Remote Fault (bit 4.13)  
When the ICS1893BF Auto-Negotiation sublayer is enabled, the ICS1893BF transmits the Remote Fault bit  
4.13 to its remote link partner during the auto-negotiation process. The Remote Fault bit is part of the Link  
Code Word that the ICS1893BF exchanges with its remote link partner. The ICS1893BF sets this bit to logic  
one whenever it detects a problem with the link, locally. The data in this register is sent to the remote link  
partner to inform it of the potential problem. If the ICS1893BF does not detect a link fault, it clears bit 4.13  
to logic zero.  
Whenever the ICS1893BF:  
• Does not detect a link fault, the ICS1893BF clears bit 4.13 to logic zero.  
• Detects a problem with the link, during the auto-negotiation process, this bit is set. As a result, the data  
on this bit is sent to the remote link partner to inform it of the potential problem.  
7.6.4 IEEE Reserved Bits (bits 4.12:10)  
The IEEE reserves these bits for future use. When an STA:  
• Reads a reserved bit, the ICS1893BF returns a logic zero.  
• Writes to a reserved bit, it must use the default value specified in this data sheet.  
The ICS1893BF uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the  
ICS1893BF, an STA must maintain the default value of these bits. Therefore, ICS recommends that during  
any STA write operation, an STA write the default value to all reserved bits, even those bits that are Read  
Only.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
66  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.6.5 Technology Ability Field (bits 4.9:5)  
When its Auto-Negotiation sublayer is enabled, the ICS1893BF transmits its link capabilities to its remote  
link partner during the auto-negotiation process. The Technology Ability Field (TAF) bits 4.12:5 determine  
the specific abilities that the ICS1893BF advertises. The ISO/IEC specification defines the TAF  
technologies in Annex 28B.  
The ISO/IEC specification reserves bits 4.12:10 for future use. When each of these reserved bits is:  
• Read by an STA, the ICS1893BF returns a logic zero  
• Written to by an STA, the STA must use the default value specified in this data sheet  
ICS uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893BF,  
an STA must maintain the default value of these bits. Therefore, ICS recommends that an STA always write  
the default value of any reserved bits during all management register write operations.  
Reserved bits 4.12:10 are Command Override Write (CW) bits. Whenever bit 16.15 (the Command  
Register Override bit) is logic:  
• Zero, the ICS1893BF isolates all STA writes to CW bits, including bits 4.12:10.  
• One, an STA can modify the value of bits 4.12:10  
Each of the bits 4.9:5 in the TAF represent a specific technology capability. When one of these bits is logic:  
• Zero, it indicates to the remote link partner that the local device cannot support the technology  
represented by the bit.  
• One, it indicates to the remote link partner that the local device can support the technology.  
With the exception of bit 4.9, the default settings of the TAF bits depend on the ICS1893BF operating  
mode. Bit 4.9 is always logic zero, indicating that the ICS1893BF cannot support 100Base-T4 operations.  
The TAF bits are Command Override Write bits. The default value of these bits depends on the signal level  
on the HW/SW pin and whether the Auto-Negotiation sublayer is enabled.  
With the Auto-Negotiation Enable bit (bit 0.12) set to logic:  
• Zero (that is, disabled), the ICS1893BF does not execute the auto-negotiation process. Upon completion  
of the initialization sequence, the ICS1893BF proceeds to the Idle state and begins transmitting IDLES.  
Two Control Register bits – the Data Rate Select bit (bit 0.13) and the Duplex Select bit (bit 0.8) –  
determine the technology mode that the ICS1893BF uses for data transmission and reception. In this  
mode, the values of the TAF bits (bits 4.8:5) are undefined.  
• One (that is, enabled), the ICS1893BF executes the auto-negotiation process and advertises its  
capabilities to the remote link partner. The TAF bits (bits 4.8:5) determine the capabilities that the  
ICS1893BF advertises to its remote link partner. For the ICS1893BF, all of these bits 4.8:5 are set to logic  
one, indicating the ability of the ICS1893BF to provide these technologies.  
Note:  
1. The ICS1893BF does not alter the value of the Status Register bits based on the TAF bits in  
register 4, as the ISO/IEC definitions for the Status Register bits require these bits to indicate all the  
capabilities of the ICS1893BF.  
2. The STA can alter the default TAF bit settings, 4.12:5, and subsequently issue an Auto-Negotiation  
Restart.  
7.6.6 Selector Field (Bits 4.4:0)  
When its Auto-Negotiation Sublayer is enabled, the ICS1893BF transmits its link capabilities to its remote  
Link Partner during the auto-negotiation process. The Selector Field is transmitted based on the value of  
bits 4.4:0. These bits indicate to the remote link partner the type of message being sent during the  
auto-negotiation process. The ICS1893BF supports IEEE Std. 802.3, represented by a value of 00001b in  
bits 4.4:0. The ISO/IEC 8802-3 standard defines the Selector Field technologies in Annex 28A.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
67  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.7 Register 5: Auto-Negotiation Link Partner Ability Register  
Table 7-12 lists the bits for the Auto-Negotiation Link Partner Ability Register. An STA uses this register to  
determine the capabilities being advertised by the remote link partner. During the auto-negotiation process,  
the ICS1893BF advertises (that is, exchanges) the capability data with its remote link partner using a  
pre-defined Link Code Word. The value of the Link Control Word received from its remote link partner  
establishes the value of the bits in this register.  
Note:  
1. For an explanation of acronyms used in Table 7-12, see Chapter 1, “Abbreviations and Acronyms”.  
2. The values in this register are valid only when the auto-negotiation process is complete, as indicated by  
bit 1.5 or bit 17.4.  
Table 7-12. Auto-Negotiation Link Partner Ability Register (register 5 [0x05])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac- SF De- Hex  
cess  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
CW  
CW  
CW  
CW  
fault  
5.15 Next Page  
Next Page disabled  
Always 0  
Next Page enabled  
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0
0
0
0
0
5.14 Acknowledge  
5.13 Remote fault  
5.12 IEEE reserved  
5.11 IEEE reserved  
5.10 IEEE reserved  
N/A  
0
No faults detected  
Always 0  
Remote fault detected  
0
N/A  
0†  
0†  
0†  
0
Always 0  
N/A  
Always 0  
N/A  
5.9  
5.8  
5.7  
5.6  
5.5  
5.4  
5.3  
5.2  
5.1  
5.0  
100Base-T4  
Always 0. (Not supported.)  
N/A  
100Base-TX, full duplex Link partner is not capable  
100Base-TX, half duplex Link partner is not capable  
Link partner is capable  
Link partner is capable  
Link partner is capable  
Link partner is capable  
0
0
10Base-T, full duplex  
10Base-T, half duplex  
Selector Field bit S4  
Selector Field bit S3  
Selector Field bit S2  
Selector Field bit S1  
Selector Field bit S0  
Link partner is not capable  
Link partner is not capable  
0
0
IEEE 802.3 defined. Always 0. N/A  
IEEE 802.3 defined. Always 0. N/A  
IEEE 802.3 defined. Always 0. N/A  
IEEE 802.3 defined. Always 0. N/A  
0
0
0
0
N/A  
IEEE 802.3 defined.  
Always 1.  
0
† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value  
to all Reserved bits.  
7.7.1 Next Page (bit 5.15)  
If bit 5.15 is logic:  
• Zero, then the remote link partner is indicating that this is the last page being transmitted.  
• One, then the remote link partner is indicating that additional pages follow.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
68  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.7.2 Acknowledge (bit 5.14)  
The ISO/IEC specification defines bit 5.14 as the Acknowledge bit. When this bit is a:  
• Zero, it indicates that the remote link partner has not received the ICS1893BF Link Control Word.  
• One, it indicates to the ICS1893BF / STA that the remote link partner has acknowledged reception of the  
ICS1893BF Link Control Word.  
7.7.3 Remote Fault (bit 5.13)  
The ISO/IEC specification defines bit 5.13 as the Remote Fault bit. This bit is set based on the Link Control  
Word received from the remote link partner. When this bit is a logic:  
• Zero, it indicates that the remote link partner detects a Link Fault.  
• One, it indicates to the ICS1893BF / STA that the remote link partner detects a Link Fault.  
Note: For more information about this bit, see Section 7.3.9, “Remote Fault (bit 1.4)”.  
7.7.4 Technology Ability Field (bits 5.12:5)  
The Technology Ability Field (TAF) bits (bits 5.12:5) determine the specific abilities that the remote link  
partner is advertising. These bits are set based upon the Link Code Word received from the remote link  
partner during the auto-negotiation process. The ISO/IEC specification defines the TAF technologies in  
Annex 28B.  
The ISO/IEC specification reserves bits 5.12:10 for future use. When each of these reserved bits is:  
• Read by an STA, the ICS1893BF returns a logic zero.  
• Written to by an STA, the STA must use the default value specified in this data sheet.  
IDT uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893BF,  
an STA must maintain the default value of these bits. Therefore, IDT recommends that an STA always write  
the default value of any reserved bits during all management register write operations.  
7.7.5 Selector Field (bits 5.4:0)  
The Selector Field bits indicate the technology or encoding that the remote link partner is using for the  
Auto-Negotiation message. The ICS1893BF supports only IEEE Std. 802.3, represented by a value of  
00001b in bits 5.4:0. The ISO/IEC standard defines the Selector Field technologies in Annex 28A.  
Presently, the IEEE standard defines the following two valid codes:  
• 00001b (IEEE Std 802.3)  
• 00010b (IEEE Std 802.9)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
69  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.8 Register 6: Auto-Negotiation Expansion Register  
Table 7-13 lists the bits for the Auto-Negotiation Expansion Register, which indicates the status of the  
Auto-Negotiation process.  
Note: For an explanation of acronyms used in Table 7-13, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-13. Auto-Negotiation Expansion Register (register 6 [0x06])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac- SF De- Hex  
cess  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
CW  
fault  
0†  
0†  
0†  
0†  
0†  
0†  
0†  
0†  
0†  
0†  
0†  
0
6.15 IEEE reserved  
6.14 IEEE reserved  
6.13 IEEE reserved  
6.12 IEEE reserved  
6.11 IEEE reserved  
6.10 IEEE reserved  
Always 0  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
–
–
–
–
–
–
–
–
–
–
–
0
0
0
Always 0  
Always 0  
Always 0  
Always 0  
Always 0  
Always 0  
Always 0  
Always 0  
Always 0  
Always 0  
No Fault  
6.9  
6.8  
6.7  
6.6  
6.5  
6.4  
IEEE reserved  
IEEE reserved  
IEEE reserved  
IEEE reserved  
IEEE reserved  
Parallel detection fault  
Multiple technologies  
detected  
RO LH  
6.3  
6.2  
Link partner Next Page  
able  
Link partner is not Next  
Page able  
Link partner is Next Page  
able  
RO  
RO  
–
–
0
1
4
Next Page able  
Local device is not Next  
Page able  
Local device is Next Page  
able  
6.1  
6.0  
Page received  
Next Page not received  
Next Page received  
RO LH  
RO  
0
0
Link partner  
Link partner is not  
Link partner is  
–
Auto-Negotiation able  
Auto-Negotiation able  
Auto-Negotiation able  
† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value  
to all Reserved bits.  
7.8.1 IEEE Reserved Bits (bits 6.15:5)  
The ISO/IEC specification reserves these bits for future use. When an STA:  
• Reads a reserved bit, the ICS1893BF returns a logic zero.  
• Writes to a reserved bit, the STA must use the default value specified in this data sheet.  
ICS uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893BF,  
an STA must maintain the default value of these bits. Therefore, IDT recommends that an STA always write  
the default value of any reserved bits during all management register write operations.  
Reserved bits 5.15:5 are Command Override Write (CW) bits. When the Command Register Override bit  
(bit 16.15) is logic:  
• Zero, the ICS1893BF isolates all STA writes to CW bits.  
• One, an STA can modify the value of these bits  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
70  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.8.2 Parallel Detection Fault (bit 6.4)  
The ICS1893BF sets this bit to a logic one if a parallel detection fault is encountered. A parallel detection  
fault occurs when the ICS1893BF cannot disseminate the technology being used by its remote link partner.  
Bit 6.4 is a latching high (LH) status bit. (For more information on latching high and latching low bits, see  
Section 7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
7.8.3 Link Partner Next Page Able (bit 6.3)  
Bit 6.3 is a status bit that reports the capabilities of the remote link partner to support the Next Page  
features of the auto-negotiation process. The ICS1893BF sets this bit to a logic one if the remote link  
partner sets the Next Page bit in its Link Control Word.  
7.8.4 Next Page Able (bit 6.2)  
Bit 6.2 is a status bit that reports the capabilities of the ICS1893BF to support the Next Page features of the  
auto-negotiation process. The ICS1893BF sets this bit to a logic one to indicate that it can support these  
features.  
7.8.5 Page Received (bit 6.1)  
The ICS1893BF sets its Page Received bit to a logic one whenever a new Link Control Word is received  
and stored in its Auto-Negotiation link partner ability register. The Page Received bit is cleared to logic zero  
on a read of the Auto-Negotiation Expansion Register.  
Bit 6.1 is a latching high (LH) status bit. (For more information on latching high and latching low bits, see  
Section 7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
7.8.6 Link Partner Auto-Negotiation Able (bit 6.0)  
If the ICS1893BF:  
• Does not receive Fast Link Pulse bursts from its remote link partner, then this bit remains a logic zero.  
• Receives valid FLP bursts from its remote link partner (thereby indicating that it can participate in the  
auto-negotiation process), then the ICS1893BF sets this bit to a logic one.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
71  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.9 Register 7: Auto-Negotiation Next Page Transmit Register  
Table 7-14 lists the bits for the Auto-Negotiation Next Page Transmit Register, which establishes the  
contents of the Next Page Link Control Word that is transmitted during Next Page Operations. This table is  
compliant with the ISO/IEC specification.  
Note: For an explanation of acronyms used in Table 7-14, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-14. Auto-Negotiation Next Page Transmit Register (register 7 [0x07])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac- SF De- Hex  
cess  
RW  
RO  
fault  
7.15 Next Page  
Last Page  
Additional Pages follow  
N/A  
–
–
–
–
0
2
7.14 IEEE reserved  
7.13 Message Page  
7.12 Acknowledge 2  
Always 0  
0†  
1
Unformatted Page  
Message Page  
RW  
RW  
Cannot comply with  
Message  
Can comply with  
Message  
0
7.11 Toggle  
Previous Link Code  
Word was zero  
Previous Link Code  
Word was one  
RO  
RW  
RW  
RW  
RW  
RW  
RW  
RW  
RW  
RW  
RW  
RW  
–
–
–
–
–
–
–
–
–
–
–
–
0
0
0
0
0
0
0
0
0
0
0
1
0
7.10 Message code field  
/Unformatted code field  
Bit value depends on  
Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
7.9  
7.8  
7.7  
7.6  
7.5  
7.4  
7.3  
7.2  
7.1  
7.0  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
0
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
1
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value  
to all Reserved bits.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
72  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.9.1 Next Page (bit 7.15)  
This bit is used by a PHY/STA to enable the transmission of Next Pages following the base Link Control  
Word as long as the remote link partner supports the Next Page features of Auto-Negotiation.  
This bit is used to establish the state of the Next Page (NP) bit of the Next Page Link Control Word (that is,  
the NP bit of the Next Page Link Control Word tracks this bit). During a Next Page exchange, if the NP bit  
is logic:  
• Zero, it indicates to the remote link partner that this is the last Message or Page.  
• One, it indicates to the remote link partner that additional Pages follow this Message.  
7.9.2 IEEE Reserved Bit (bit 7.14)  
The ISO/IEC specification reserves this bit for future use. When this reserved bit is:  
• Read by an STA, the ICS1893BF returns a logic zero.  
• Written to by an STA, the STA must use the default value specified in this data sheet.  
IDT uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893BF,  
an STA must maintain the default value of these bits. Therefore, IDT recommends that an STA always write  
the default value of any reserved bits during all management register write operations.  
7.9.3 Message Page (bit 7.13)  
The Message Page (MP) bit (bit 7.13) is used to determine the format or type of Page being transmitted.  
The value of this bit establishes the state of the MP bit in the Next Page Link Control Word.  
If this bit is set to logic:  
• Zero, it indicates that the Page is an Unformatted Page.  
• One, it indicates to the remote link partner that the Page being transmitted is a Message Page.  
7.9.4 Acknowledge 2 (bit 7.12)  
This bit is used to indicate the ability of the ICS1893BF to comply with a message.  
The value of this bit establishes the state of the Ack2 bit in the Next Page Link Control Word. If this bit is set  
to logic:  
• Zero, it indicates that the ICS1893BF cannot comply with the message.  
• One, it indicates to the remote link partner that the ICS1893BF can comply with the message.  
7.9.5 Toggle (bit 7.11)  
The Toggle (T) bit (bit 7.11) is used to synchronize the transmission of Next Page messages with the  
remote link partner. The value of this bit establishes the state of the Toggle bit in the Next Page Link Control  
Word. This bit toggles with each transmitted Link Control Word.  
If the previous Next Page Link Control Word Toggle bit has a value of logic:  
• Zero, then the Toggle bit is set to logic one.  
• One, then the Toggle bit is set to logic zero.  
The initial Next Page Link Control Word Toggle bit is set to the inverse of the base Link Control Word bit 11.  
7.9.6 Message Code Field / Unformatted Code Field (bits 7.10:0)  
Bits 7.10:0 represent either the Message Code field M[10:0] or the Unformatted Code field U[10:0] bits. The  
value of these bits establish the state of the M[10:0] / U[10:0] bits in the Next Page Link Control Word.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
73  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.10 Register 8: Auto-Negotiation Next Page Link Partner Ability Register  
Table 7-15 lists the bits for the Auto-Negotiation Next Page Link Partner Ability Register, which establishes  
the contents of the Next Page Link Control Word that is transmitted during Next Page Operations. This  
table is compliant with the ISO/IEC specification.  
Note: For an explanation of acronyms used in Table 7-15, see Chapter 1, “Abbreviations and Acronyms”.  
Table 7-15. Auto-Negotiation Next Page Link Partner Ability Register (register 8 [0x08])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac- SF De- Hex  
cess  
RO  
RO  
RO  
RO  
fault  
8.15 Next Page  
Last Page  
Additional Pages follow  
N/A  
–
–
–
–
0
0
8.14 IEEE reserved  
8.13 Message Page  
8.12 Acknowledge 2  
Always 0  
0†  
0
Unformatted Page  
Message Page  
Cannot comply with  
Message  
Can comply with  
Message  
0
8.11 Toggle  
Previous Link Code  
Word was zero  
Previous Link Code  
Word was one  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
RO  
–
–
–
–
–
–
–
–
–
–
–
–
0
0
0
0
0
0
0
0
0
0
0
0
0
8.10 Message code field  
/Unformatted code field  
Bit value depends on  
Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
Bit value depends on Bit value depends on  
the particular message the particular message  
8.9  
8.8  
8.7  
8.6  
8.5  
8.4  
8.3  
8.2  
8.1  
8.0  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
0
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
0
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
Message code field  
/Unformatted code field  
† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value  
to all Reserved bits.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
74  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.10.1 Next Page (bit 8.15)  
This bit is used by a PHY/STA to enable the transmission of Next Pages following the base Link Control  
Word as long as the remote link partner supports the Next Page features of Auto-Negotiation.  
This bit is used to establish the state of the Next Page (NP) bit of the Next Page Link Control Word (that is,  
the NP bit of the Next Page Link Control word tracks this bit). During a Next Page exchange, if the NP bit is  
logic:  
• Zero, it indicates to the remote link partner that this is the last Message or Page.  
• One, it indicates to the remote link partner that additional Pages follow this Message.  
7.10.2 IEEE Reserved Bit (bit 8.14)  
The ISO/IEC specification reserves this bit for future use. When this reserved bit is:  
• Read by an STA, the ICS1893BF returns a logic zero.  
• Written to by an STA, the STA must use the default value specified in this data sheet.  
IDT uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893BF,  
an STA must maintain the default value of these bits. Therefore, IDT recommends that an STA always write  
the default value of any reserved bits during all management register write operations.  
7.10.3 Message Page (bit 8.13)  
The Message Page (MP) bit (bit 8.13) is used to determine the format or type of Page being transmitted.  
The value of this bit establishes the state of the MP bit in the Next Page Link Control Word.  
If this bit is set to logic:  
• Zero, it indicates that the Page is an Unformatted Page.  
• One, it indicates to the remote link partner that the Page being transmitted is a Message Page.  
7.10.4 Acknowledge 2 (bit 8.12)  
This bit is used to indicate the ability of the ICS1893BF to comply with a message.  
The value of this bit establishes the state of the Ack2 bit in the Next Page Link Control Word. If this bit is set  
to logic:  
• Zero, it indicates that the ICS1893BF cannot comply with the message.  
• One, it indicates to the remote link partner that the ICS1893BF can comply with the message.  
If the previous Next Page Link Control Word Toggle bit has a value of logic:  
• Zero, then the Toggle bit is set to logic one.  
• One, then the Toggle bit is set to logic zero.  
The initial Next Page Link Control Word Toggle bit is set to the inverse of the base Link Control Word bit 11.  
7.10.5 Message Code Field / Unformatted Code Field (bits 8.10:0)  
Bits 8.10:0 represent either the Message Code field M[10:0] or the Unformatted Code field U[10:0] bits. The  
value of these bits establish the state of the M[10:0] / U[10:0] bits in the Next Page Link Control Word.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
75  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.11 Register 16: Extended Control Register  
Table 7-16 lists the bits for the Extended Control Register, which the ICS1893BF provides to allow an STA  
to customize the operations of the device.  
Note:  
1. For an explanation of acronyms used in Table 7-16, see Chapter 1, “Abbreviations and Acronyms”.  
2. During any write operation to any bit in this register, the STA must write the default value to all  
Reserved bits.  
Table 7-16. Extended Control Register (register 16 [0x10])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac-  
SF  
De-  
Hex  
cess  
fault  
16.15 Command Override Write Disabled  
enable  
Enabled  
RW  
SC  
0
–
16.14 ICS reserved  
16.13 ICS reserved  
16.12 ICS reserved  
16.11 ICS reserved  
16.10 PHY Address Bit 4  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
RW/0  
RW/0  
RW/0  
RW/0  
RO  
–
–
–
–
–
0
Read unspecified  
Read unspecified  
Read unspecified  
0
0
0
–
For a detailed explanation of this bit’s operation,  
see Section 5.5, “Status Interface”.  
P4RD†  
16.9  
16.8  
16.7  
16.6  
PHY Address Bit 3  
PHY Address Bit 2  
PHY Address Bit 1  
PHY Address Bit 0  
For a detailed explanation of this bit’s operation,  
see Section 5.5, “Status Interface”.  
RO  
RO  
RO  
RO  
–
–
–
–
P3TD†  
P2LI†  
For a detailed explanation of this bit’s operation,  
see Section 5.5, “Status Interface”.  
For a detailed explanation of this bit’s operation,  
see Section 5.5, “Status Interface”.  
P1CL†  
P0AC†  
–
8
For a detailed explanation of this bit’s operation,  
see Section 5.5, “Status Interface”.  
16.5  
16.4  
16.3  
16.2  
16.1  
16.0  
Stream Cipher Test Mode Normal operation  
Test mode  
RW  
RW/0  
RW  
–
–
–
–
–
–
0
–
1
0
0
0
ICS reserved  
Read unspecified  
NRZ encoding  
Disabled  
Read unspecified  
NRZI encoding  
Enabled  
NRZ/NRZI encoding  
Transmit invalid codes  
ICS reserved  
RW  
Read unspecified  
Read unspecified  
RW/0  
RW  
Stream Cipher disable  
Stream Cipher enabled Stream Cipher disabled  
† The default is the state of this pin at reset.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
76  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.11.1 Command Override Write Enable (bit 16.15)  
The Command Override Write Enable bit provides an STA the ability to alter the Command Override Write  
(CW) bits located throughout the MII Register set. A two-step process is required to alter the value of a CW  
bit:  
1. Step one is to issue a Command Override Write, (that is, set bit 16.15 to logic one). This step enables  
the next MDIO write to have the ability to alter any CW bit.  
2. Step two is to write to the register that includes the CW bit which requires modification.  
Note: The Command Override Write Enable bit is a Self-Clearing bit that is automatically reset to logic  
zero after the next MII write, thereby allowing only one subsequent write to alter the CW bits in a  
single register. To alter additional CW bits, the Command Override Write Enable bit must once  
again be set to logic one.  
7.11.2 ICS Reserved (bits 16.14:11)  
IDT is reserving these bits for future use. Functionally, these bits are equivalent to IEEE Reserved bits.  
When one of these reserved bits is:  
• Read by an STA, the ICS1893BF returns a logic zero.  
• Written to by an STA, the STA must use the default value specified in this data sheet.  
IDT uses some reserved bits to invoke auxiliary functions. To ensure proper operation of the ICS1893BF,  
an STA must maintain the default value of these bits. Therefore, IDT recommends that an STA always write  
the default value of any reserved bits during all management register write operations.  
7.11.3 PHY Address (bits 16.10:6)  
These five bits hold the Serial Management Port Address of the ICS1893BF. During either a hardware reset  
or a power-on reset, the PHY address is read from the LED interface. (For information on the LED  
interface, see Section 5.5, “Status Interface” and Section 8.2.2, “Multi-Function (Multiplexed) Pins: PHY  
Address and LED Pins”). The PHY address is then latched into this register. (The value of each of the PHY  
Address bits is unaffected by a software reset.)  
7.11.4 Stream Cipher Scrambler Test Mode (bit 16.5)  
The Stream Cipher Scrambler Test Mode bit is used to force the ICS1893BF to lose LOCK, thereby  
requiring the Stream Cipher Scrambler to resynchronize.  
7.11.5 ICS Reserved (bit 16.4)  
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.  
7.11.6 NRZ/NRZI Encoding (bit 16.3)  
This bit allows an STA to control whether NRZ (Not Return to Zero) or NRZI (Not Return to Zero, Invert on  
One) encoding is applied to the serial transmit data stream in 100Base-TX mode. When this bit is logic:  
• Zero, the ICS1893BF encodes the serial transmit data stream using NRZ encoding.  
• One, the ICS1893BF encodes the serial transmit data stream using NRZI encoding.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
77  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.11.7 Invalid Error Code Test (bit 16.2)  
The Invalid Error Code Test bit allows an STA to force the ICS1893BF to transmit symbols that are typically  
classified as invalid. The purpose of this test bit is to permit thorough testing of the 4B/5B encoding and the  
serial transmit data stream by allowing generation of bit patterns that are considered invalid by the ISO/IEC  
4B/5B definition.  
When this bit is logic:  
• Zero, the ISO/IEC defined 4B/5B translation takes place.  
• One – and the TXER signal is asserted by the MAC – the MII input nibbles are translated according to  
Table 7-17.  
Table 7-17. Invalid Error Code Translation Table  
Symbol  
Meaning  
MII Input Translation  
Nibble  
V
V
Invalid Code  
Invalid Code  
Invalid Code  
Invalid Code  
Error  
0000  
0001  
0010  
0011  
0100  
0101  
0110  
0111  
1000  
1001  
1010  
1011  
1100  
1101  
1110  
1111  
00000  
00001  
00010  
00011  
00100  
00101  
00110  
00111  
00000  
01101  
01100  
10001  
10000  
11001  
11000  
11111  
V
V
H
V
Invalid Code  
Invalid Code  
ESD  
V
R
V
Invalid Code  
ESD  
T
V
Invalid Code  
SSD  
K
V
Invalid Code  
Invalid Code  
SSD  
V (S)  
J
I
Idle  
7.11.8 ICS Reserved (bit 16.1)  
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.  
7.11.9 Stream Cipher Disable (bit 16.0)  
The Stream Cipher Disable bit allows an STA to control whether the ICS1893BF employs the Stream  
Cipher Scrambler in the transmit and receive data paths. When this bit is set to logic:  
• Zero, the Stream Cipher Encoder and Decoder are both enabled for normal operations.  
• One, the Stream Cipher Encoder and Decoder are disabled. This action results in an unscrambled data  
stream (for example, the ICS1893BF transmits unscrambled IDLES, and so forth.  
Note: The Stream Cipher Scrambler can be used only for 100-MHz operations.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
78  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.12 Register 17: Quick Poll Detailed Status Register  
Table 7-18 lists the bits for the Quick-Poll Detailed Status Register. This register is a 16-bit read-only  
register used to provide an STA with detailed status of the ICS1893BF operations. During reset, it is  
initialized to pre-defined default values.  
Note:  
1. For an explanation of acronyms used in Table 7-18, see Chapter 1, “Abbreviations and Acronyms”.  
2. Most of this register’s bits are latching high or latching low, which allows the ICS1893BF to capture and  
save the occurrence of an event for an STA to read. (For more information on latching high and latching  
low bits, see Section 7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
3. Although some of these status bits are redundant with other management registers, the ICS1893BF  
provides this group of bits to minimize the number of Serial Management Cycles required to collect the  
status data.  
Table 7-18. Quick Poll Detailed Status Register (register 17 [0x11])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac-  
cess  
SF  
De- Hex  
fault  
17.15 Data rate  
17.14 Duplex  
10 Mbps  
Half duplex  
100 Mbps  
Full duplex  
RO  
RO  
RO  
–
–
–
–
0
–
17.13 Auto-Negotiation  
Progress Monitor Bit 2  
Reference Decode Table Reference Decode Table  
Reference Decode Table Reference Decode Table  
Reference Decode Table Reference Decode Table  
LMX  
17.12 Auto-Negotiation  
Progress Monitor Bit 1  
RO  
RO  
RO  
RO  
LMX  
LMX  
LH  
0
0
0
0
17.11 Auto-Negotiation  
Progress Monitor Bit 0  
0
17.10 100Base-TX signal  
lost  
Valid signal  
PLL locked  
Signal lost  
17.9  
100BasePLL Lock  
Error  
PLL failed to lock  
LH  
17.8  
17.7  
False Carrier detect  
Normal Carrier or Idle  
Valid symbols observed  
False Carrier  
RO  
RO  
LH  
LH  
0
0
Invalid symbol  
detected  
Invalid symbol received  
0
17.6  
17.5  
Halt Symbol detected No Halt Symbol received Halt Symbol received  
RO  
RO  
LH  
LH  
0
0
Premature End  
detected  
Normal data stream  
Stream contained two  
IDLE symbols  
17.4  
17.3  
Auto-Negotiation  
complete  
Auto-Negotiation in  
process  
Auto-Negotiation  
complete  
RO  
RO  
–
–
0
0
100Base-TX signal  
detect  
Signal present  
No signal present  
0
17.2  
17.1  
17.0  
Jabber detect  
Remote fault  
Link Status  
No jabber detected  
Jabber detected  
RO  
RO  
RO  
LH  
LH  
LL  
0
0
0
No remote fault detected Remote fault detected  
Link is not valid Link is valid  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
79  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.12.1 Data Rate (bit 17.15)  
The Data Rate bit indicates the ‘selected technology’. If the ICS1893BF is in:  
• Hardware mode, the value of this bit is determined by the 10/100SEL input pin.  
• Software mode, the value of this bit is determined by the Data Rate bit 0.13.  
When bit 17.15 is logic:  
• Zero, it indicates that 10-MHz operations are selected.  
• One, the ICS1893BF is indicating that 100-MHz operations are selected.  
Note: This bit does not imply any link status.  
7.12.2 Duplex (bit 17.14)  
The Duplex bit indicates the ‘selected technology’. If the ICS1893BF is in:  
• Hardware mode, the value of this bit is determined by the DPXSEL input pin.  
• Software mode, the value of this bit is determined by the Duplex Mode bit 0.8.  
When bit 17.14 is logic:  
• Zero, it indicates that half-duplex operations are selected.  
• One, the ICS1893BF is indicating that full-duplex operations are selected.  
Note: This bit does not imply any link status.  
7.12.3 Auto-Negotiation Progress Monitor (bits 17.13:11)  
The Auto-Negotiation Progress Monitor consists of the Auto-Negotiation Complete bit (bit 17.4) and the  
three Auto-Negotiation Monitor bits (bits 17.13:11). The Auto-Negotiation Progress Monitor continually  
examines the state of the Auto-Negotiation Process State Machine and reports the status of  
Auto-Negotiation using the three Auto-Negotiation Monitor bits. Therefore, the value of these three bits  
provides the status of the Auto-Negotiation Process.  
These three bits are initialized to logic zero in one of the following ways:  
• A reset (see Section 4.1, “Reset Operations”)  
• Disabling Auto-Negotiation [see Section 7.2.4, “Auto-Negotiation Enable (bit 0.12)”]  
• Restarting Auto-Negotiation [see Section 7.2.7, “Restart Auto-Negotiation (bit 0.9)”]  
If Auto-Negotiation is enabled, these bits continually latch the highest state that the Auto-Negotiation State  
Machine achieves. That is, they are updated only if the binary value of the next state is greater than the  
binary value of the present state as outlined in Table 7-19.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
80  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
Note: An MDIO read of these bits provides a history of the greatest progress achieved by the  
auto-negotiation process. In addition, the MDIO read latches the present state of the  
Auto-Negotiation State Machine for a subsequent read.  
Table 7-19. Auto-Negotiation State Machine (Progress Monitor)  
Auto-Negotiation State Machine  
Auto-Negotiation Progress Monitor  
Auto-  
Auto-  
Auto-  
Auto-  
Negotiation  
Negotiation  
Negotiation  
Negotiation  
Complete Bit Monitor Bit 2 Monitor Bit 1 Monitor Bit 0  
(Bit 17.4)  
(Bit 17.13)  
(Bit 17.12)  
(Bit 17.11)  
Idle  
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
Parallel Detected  
Parallel Detection Failure  
Ability Matched  
Acknowledge Match Failure  
Acknowledge Matched  
Consistency Match Failure  
Consistency Matched  
Auto-Negotiation Completed  
Successfully  
7.12.4 100Base-TX Receive Signal Lost (bit 17.10)  
The 100Base-TX Receive Signal Lost bit indicates to an STA whether the ICS1893BF has lost its  
100Base-TX Receive Signal. If this bit is set to a logic:  
• Zero, it indicates the Receive Signal has remained valid since either the last read or reset of this register.  
• One, it indicates the Receive Signal was lost since either the last read or reset of this register.  
This bit is a latching high bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: This bit has no definition in 10Base-T mode.  
7.12.5 100Base PLL Lock Error (bit 17.9)  
The Phase-Locked Loop (PLL) Lock Error bit indicates to an STA whether the ICS1893BF has ever  
experienced a PLL Lock Error. A PLL Lock Error occurs when the PLL fails to lock onto the incoming  
100Base data stream. If this bit is set to a logic:  
• Zero, it indicates that a PLL Lock Error has not occurred since either the last read or reset of this register.  
• One, it indicates that a PLL Lock Error has occurred since either the last read or reset of this register.  
This bit is a latching high bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: This bit has no definition in 10Base-T mode.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
81  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.12.6 False Carrier (bit 17.8)  
The False Carrier bit indicates to an STA the detection of a False Carrier by the ICS1893BF in 100Base  
mode.  
A False Carrier occurs when the ICS1893BF begins evaluating potential data on the incoming 100Base  
data stream, only to learn that it was not a valid /J/K/. If this bit is set to a logic:  
• Zero, it indicates a False Carrier has not been detected since either the last read or reset of this register.  
• One, it indicates a False Carrier was detected since either the last read or reset of this register.  
This bit is a latching high bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: This bit has no definition in 10Base-T mode.  
7.12.7 Invalid Symbol (bit 17.7)  
The Invalid Symbol bit indicates to an STA the detection of an Invalid Symbol in a 100Base data stream by  
the ICS1893BF.  
When the ICS1893BF is receiving a packet, it examines each received Symbol to ensure the data is error  
free. If an error occurs, the port indicates this condition to the MAC by asserting the RXER signal. In  
addition, the ICS1893BF sets its Invalid Symbol bit to logic one. Therefore, if this bit is set to a logic:  
• Zero, it indicates an Invalid Symbol has not been detected since either the last read or reset of this  
register.  
• One, it indicates an Invalid Symbol was detected since either the last read or reset of this register.  
This bit is a latching high bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: This bit has no definition in 10Base-T mode.  
7.12.8 Halt Symbol (bit 17.6)  
The Halt Symbol bit indicates to an STA the detection of a Halt Symbol in a 100Base data stream by the  
ICS1893BF.  
During reception of a valid packet, the ICS1893BF examines each symbol to ensure that the data being  
passed to the MAC Interface is error free. In addition, it looks for special symbols such as the Halt Symbol.  
If a Halt Symbol is encountered, the ICS1893BF indicates this condition to the MAC.  
If this bit is set to a logic:  
• Zero, it indicates a Halt Symbol has not been detected since either the last read or reset of this register.  
• One, it indicates a Halt Symbol was detected in the packet since either the last read or reset of this  
register.  
This bit is a latching high bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: This bit has no definition in 10Base-T mode.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
82  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.12.9 Premature End (bit 17.5)  
The Premature End bit indicates to an STA the detection of two consecutive Idles in a 100Base data stream  
by the ICS1893BF.  
During reception of a valid packet, the ICS1893BF examines each symbol to ensure that the data being  
passed to the MAC Interface is error free. If two consecutive Idles are encountered, it indicates this  
condition to the MAC by setting this bit.  
If this bit is set to a logic:  
• Zero, it indicates a Premature End condition has not been detected since either the last read or reset of  
this register.  
• One, it indicates a Premature End condition was detected in the packet since either the last read or reset  
of this register.  
This bit is a latching high bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: This bit has no definition in 10Base-T mode.  
7.12.10 Auto-Negotiation Complete (bit 17.4)  
The Auto-Negotiation Complete bit is used to indicate to an STA the completion of the Auto-Negotiation  
process. When this bit is set to logic:  
• Zero, it indicates that the auto-negotiation process is either not complete or is disabled by the Control  
Register’s Auto-Negotiation Enable bit (bit 0.12)  
• One, it indicates that the ICS1893BF has completed the auto-negotiation process and that the contents  
of Management Registers 4, 5, and 6 are valid.  
7.12.11 100Base-TX Signal Detect (bit 17.3)  
The 100Base-TX Signal Detect bit indicates either the presence or absence of a signal on the Twisted-Pair  
Receive pins (TP_RXP and TP_RXN) in 100Base-TX mode. This bit is logic:  
• Zero when no signal is detected on the Twisted-Pair Receive pins.  
• One when a signal is present on the Twisted-Pair Receive pins.  
7.12.12 Jabber Detect (bit 17.2)  
Bit 17.2 is functionally identical to bit 1.1. The Jabber Detect bit indicates whether a jabber condition has  
occurred. This bit is a 10Base-T function.  
7.12.13 Remote Fault (bit 17.1)  
Bit 17.1 is functionally identical to bit 1.4.  
7.12.14 Link Status (bit 17.0)  
Bit 17.0 is functionally identical to bit 1.2.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
83  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.13 Register 18: 10Base-T Operations Register  
The 10Base-T Operations Register provides an STA with the ability to monitor and control the ICS1893BF  
activity while the ICS1893BF is operating in 10Base-T mode.  
Note:  
1. For an explanation of acronyms used in Table 7-20, see Chapter 1, “Abbreviations and Acronyms”.  
2. During any write operation to any bit in this register, the STA must write the default value to all  
Reserved bits.  
Table 7-20. 10Base-T Operations Register (register 18 [0x12])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac-  
cess  
SF  
De- Hex  
fault  
18.15 Remote Jabber  
Detect  
No Remote Jabber  
Condition detected  
Remote Jabber Condition  
Detected  
RO  
LH  
0
–
18.14 Polarity reversed  
18.13 ICS reserved  
18.12 ICS reserved  
18.11 ICS reserved  
18.10 ICS reserved  
Normal polarity  
Polarity reversed  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Jabber Check disabled  
Read unspecified  
RO  
LH  
–
0
–
–
–
–
–
–
–
–
0
1
0
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Normal Jabber behavior  
Read unspecified  
RW/0  
RW/0  
RW/0  
RW/0  
RW/0  
RW/0  
RW/0  
RW/0  
RW  
–
–
–
–
0
–
18.9  
18.8  
18.7  
18.6  
18.5  
18.4  
18.3  
ICS reserved  
ICS reserved  
ICS reserved  
ICS reserved  
Jabber inhibit  
ICS reserved  
–
–
–
–
–
RW/1  
RW  
–
Auto polarity inhibit Polarity automatically  
corrected  
Polarity not automatically  
corrected  
–
18.2  
18.1  
18.0  
SQE test inhibit  
Link Loss inhibit  
Squelch inhibit  
Normal SQE test behavior SQE test disabled  
RW  
RW  
RW  
–
–
–
0
0
0
Normal Link Loss behavior Link Always = Link Pass  
Normal squelch behavior  
No squelch  
7.13.1 Remote Jabber Detect (bit 18.15)  
The Remote Jabber Detect bit is provided to indicate that an ICS1893BF port has detected a Jabber  
Condition on its receive path. This bit is reset to logic zero on a read of the 10Base-T operations register.  
When this bit is logic:  
• Zero, it indicates a Jabber Condition has not occurred on the port’s receive path since either the last read  
of this register or the last reset of the associated port.  
• One, it indicates a Jabber Condition has occurred on the port’s receive path since either the last read of  
this register or the last reset of the associated port.  
This bit is a latching high bit. (For more information on latching high and latching low bits, see Section  
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)  
Note: This bit is provided for information purposes only (that is, no actions are taken by the port). The  
ISO/IEC specification defines the Jabber Condition in terms of a port’s transmit path. To set this bit,  
an ICS1893BF port monitors its receive path and applies the ISO/IEC Jabber criteria to its receive  
path.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
84  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.13.2 Polarity Reversed (bit 18.14)  
The Polarity Reversed bit is used to inform an STA whether the ICS1893BF has detected that the signals  
on the Twisted-Pair Receive Pins (TP_RXP and TP_RXN) are reversed. When the signal polarity is:  
• Correct, the ICS1893BF sets bit 18.14 to a logic zero.  
• Reversed, the ICS1893BF sets bit 18.14 to logic one.  
Note: The ICS1893BF can detect this situation and perform all its operations normally, independent of  
the reversal.  
7.13.3 ICS Reserved (bits 18.13:6)  
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.  
7.13.4 Jabber Inhibit (bit 18.5)  
The Jabber Inhibit bit allows an STA to disable Jabber Detection. When an STA sets this bit to:  
• Zero, the ICS1893BF enables 10Base-T Jabber checking.  
• One, the ICS1893BF disables its check for a Jabber condition during data transmission.  
7.13.5 ICS Reserved (bit 18.4)  
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.  
7.13.6 Auto Polarity Inhibit (bit 18.3)  
The Auto Polarity Inhibit bit allows an STA to prevent the automatic correction of a polarity reversal on the  
Twisted-Pair Receive pins (TP_RXP and TP_RXN). If an STA sets this bit to logic:  
• Zero (the default), the ICS1893BF automatically corrects a polarity reversal on the Twisted-Pair Receive  
pins.  
• One, the ICS1893BF either disables or inhibits the automatic correction of reversed Twisted-Pair  
Receive pins.  
Note: The ICS1893BF will not complete the Auto-MDIX function for an inverted polarity cable. This  
is a rare event with modern manufactured cables. Full Auto-Negotiation and Auto Polarity  
Correction will complete when the Auto-MDIX function is disabled. Software control for the  
Auto-MDIX function is available in MDIO Register 19 Bits 9:8.  
7.13.7 SQE Test Inhibit (bit 18.2)  
The SQE Test Inhibit bit allows an STA to prevent the generation of the Signal Quality Error pulse. When an  
STA sets this bit to logic:  
• Zero, the ICS1893BF enables its SQE Test generation.  
• One, the ICS1893BF disables its SQE Test generation.  
The SQE Test provides the ability to verify that the Collision Logic is active and functional. A 10Base-T SQE  
test is performed by pulsing the Collision signal for a short time after each packet transmission completes,  
that is, after TXEN goes inactive.  
Note:  
1. The SQE Test is automatically inhibited in full-duplex and repeater modes, thereby disabling the  
functionality of this bit.  
2. This bit is a control bit and not a status bit. Therefore, it is not updated to indicate this automatic  
inhibiting of the SQE test in full-duplex mode or repeater mode.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
85  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.13.8 Link Loss Inhibit (bit 18.1)  
The Link Loss Inhibit bit allows an STA to prevent the ICS1893BF from dropping the link in 10Base-T mode.  
When an STA sets this bit to logic:  
• Zero, the state machine behaves normally and the link status is based on the signaling detected Twisted-  
Pair Receiver inputs.  
• One, the ICS1893BF 10Base-T Link Integrity Test state machine is forced into the ‘Link Passed’ state  
regardless of the Twisted-Pair Receiver input conditions.  
7.13.9 Squelch Inhibit (bit 18.0)  
The Squelch Inhibit bit allows an STA to control the ICS1893BF Squelch Detection in 10Base-T mode.  
When an STA sets this bit to logic:  
• Zero, before the ICS1893BF can establish a valid link, the ICS1893BF must receive valid 10Base-T  
data.  
• One, before the ICS1893BF can establish a valid link, the ICS1893BF must receive both valid 10Base-T  
data followed by an IDL.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
86  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
7.14 Register 19: Extended Control Register 2  
The Extended Control Register provides more refined control of the internal ICS1893BF operations.  
Note:  
1. For an explanation of acronyms used in Table 7-20, see Chapter 1, “Abbreviations and Acronyms”.  
2. During any write operation to any bit in this register, the STA must write the default value to all  
Reserved bits.  
Table 7-21. Extended Control Register (register [0x13])  
Bit  
Definition  
When Bit = 0  
When Bit = 1  
Ac-  
SF  
De-  
Hex  
cess  
fault  
19.15 Node Mode  
Node mode  
Repeater mode  
Software mode  
RO  
RO  
–
–
0
1
4
19.14 Hardware/Software  
Mode  
Hardware mode  
19.13 Remote Fault  
No faults detected  
Remote fault  
detected  
RO  
–
0
19.12 ICS reserved  
19.11 ICS reserved  
19.10 ICS reserved  
Read unspecified  
Read unspecified  
Read unspecified  
See Table 7-22  
See Table 7-22  
Read unspecified  
Read unspecified  
Read unspecified  
See Table 7-22  
See Table 7-22  
RW  
RW  
RO  
RW  
RW  
RW  
–
–
–
–
–
–
0
0
0
1
0
0
2
0
19.9  
19.8  
19.7  
AMDIX_EN  
MDI_MODE  
Twisted Pair Tri-State  
Enable, TPTRI  
Twisted Pair Signals  
are not Tri-Stated or  
No effect  
Twisted Pair  
Signals are  
Tri-Stated  
19.6  
19.5  
19.4  
19.3  
19.2  
19.1  
19.0  
ICS reserved  
ICS reserved  
ICS reserved  
ICS reserved  
ICS reserved  
ICS reserved  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
Read unspecified  
RW  
RW  
RW  
RW  
RW  
RW  
RW  
–
–
–
–
–
–
–
0
0
0
0
0
0
1
1
Automatic 100Base-TX  
Power Down  
Do not automatically Power down  
power down  
automatically  
† The default is the state of this pin at reset.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
87  
ICS1893BF Data Sheet - Release  
Chapter 7 Management Register Set  
7.14.1 Node Configuration (bit 19.15)  
The Node Configuration bit indicates the NOD/MODE.  
• In Node mode:  
– The SQE Test default setting is enabled.  
– The Carrier Sense signal (CRS) is asserted in response to either transmit or receive activity.  
• The ICS1893BF will only operate in the Node Configuration.  
7.14.2 Hardware/Software Priority Status (bit 19.14)  
The Hardware/Software Priority Status bit indicates the SW mode.  
• The (MDIO) register bits control the ICS1893BF configuration.  
• The ICS1893BF will only operate in the Software Configuration.  
7.14.3 Remote Fault (bit 19.13)  
The ISO/IEC specification defines bit 5.13 as the Remote Fault bit, and bit 19.13 is functionally identical to  
bit 5.13. The Remote Fault bit is set based on the Link Control Word received from the remote link partner.  
When this bit is a logic:  
• Zero, it indicates the remote link partner does not detect a Link Fault.  
• One, it indicates to an STA that the remote link partner detects a Link Fault.  
7.14.4 ICS Reserved (bits 19.12:10)  
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.  
7.14.5 Auto-MDI/MDIX (bits 19. 9:8) (New)  
The ICS1893BF includes the Auto-MDI/MDIX crossover feature. The Auto-MDI/MDIX feature automatically  
selects the correct MDI or MDIX configuration to match the cable plant by automatically swapping transmit  
and receive signal pairs at the PHY. Auto-MDI/MDIX is defaulted on but may be disabled for test purposes  
using either the AMDIX_EN (pin 10) or by writing (bits 19. 9:8). See Table 7-22 for AMDIX_EN (19,9) and  
MDI_MODE (19,8) operation.  
When AMDIX_EN (bit 19,9) is set to 0, the twisted pair transmit/receive is forced by the MDI_MODE bit  
(19,8).  
Note: Holding (Pin 10) AMDIX_EN low will also disable the Auto_MDIX function and force pins TP_AP  
and TP_AN to be the transmit pair and TP_BP and TP_BN to be the receive pair. AMDIX_EN has  
a built in 50K Ohm internal pull-up.  
Table 7-22. AMDIX_EN (Pin 10) and Control Bits 19. 9:8  
AMDIX_EN  
(Pin 10)  
AMDIX_EN  
[Reg 19:9]  
MDI_MODE  
[Reg 19:8]  
Tx/Rx MDI  
Configuration  
x
x
0
0
0
1
0
1
x
straight  
cross  
straight  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
88  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 7 Management Register Set  
Table 7-22. AMDIX_EN (Pin 10) and Control Bits 19. 9:8  
AMDIX_EN  
(Pin 10)  
AMDIX_EN  
[Reg 19:9]  
MDI_MODE  
[Reg 19:8]  
Tx/Rx MDI  
Configuration  
1
1
x
straight / cross (auto  
selected)  
Default Values:  
1
1
0
straight / cross (auto  
selected)  
Definitions:  
straight transmit = TP_AP & TP_AN  
receive = TP_BP & TP_BN  
cross  
transmit = TP_BP & TP_BN  
receive = TP_AP & TP_AN  
AMDIX_EN (Pin 10)AMDIX enable pin with 50 kOhm pull-up resistor  
AMDIX_EN [19:9] MDIO register 13h bit 9  
MDI_MODE [19:8] MDIO register 13h bit 8  
7.14.6 Twisted Pair Tri-State Enable, TPTRI (bit 19.7)  
The ICS1893BF provides a Twisted Pair Tri-State Enable bit. This bit forces the TP_TXP and TP_TXN  
signals to a high-impedance state. When this bit is set to logic:  
• Zero, the Twisted Pair Interface is operational.  
• One, the Twisted Pair Interface is tri-stated.  
7.14.7 ICS Reserved (bits 19.6:1)  
See Section 7.11.2, “ICS Reserved (bits 16.14:11)”, the text for which also applies here.  
7.14.8 Automatic 100Base-TX Power-Down (bit 19.0)  
The Automatic 100Base-TX Power Down bit provides an STA with the means of enabling the ICS1893BF  
to automatically shut down 100Base-TX support functions when 10Base-T operations are being used.  
When this bit is set to logic:  
• Zero, the 100Base-TX Transceiver does not power down automatically in 100Base-TX mode.  
• One, and the ICS1893BF is operating in 10Base-T mode, the 100Base-TX Transceiver automatically  
turns off to reduce the overall power consumption of the ICS1893BF.  
Note: There are other means of powering down the 100Base-TX Transceiver (for example, when the  
entire device is isolated using bit 0:10).  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
89  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.1 ICS1893BF Pin Diagram  
48L SSOP  
48  
47  
46  
45  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
VDD  
POAC  
VSS  
1
2
REF_IN  
REF_OUT  
VDD  
P1CL  
3
P2LI  
4
CRS  
VSS  
5
COL  
P3TD  
6
TXD3  
TXD2  
TXD1  
TXD0  
TXEN  
TXCLK  
VSS  
VDD  
7
P4RD  
10/100  
AMDIX_EN  
VSS  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
ICS1893BF  
TP_AP  
TP_AN  
VDD  
RXER  
RXCLK  
VDD  
TP_BN  
TP_BP  
VSS  
RXDV  
RXD0  
RXD1  
RXD2  
RXD3  
MDC  
VDD  
10TCSR  
100TCSR  
VSS  
VDD  
MDIO  
VSS  
RESET_N  
VDD  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
90  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.2 ICS1893BF Pin Descriptions  
Table 8-1. ICS1893BF MAC Interface Pins  
Signal Name  
MDIO  
Pin No.  
26  
Signal Description  
Management Data Input/Output  
Management Data Clock  
Receive Data 3  
MDC  
27  
RXD3  
28  
RXD2  
29  
Receive Data 2  
RXD1  
30  
Receive Data 1  
RXD0  
31  
Receive Data 0  
RXDV  
RXCLK  
RXER  
32  
Receive Data Valid  
Receive Clock  
34  
35  
Receive Error  
TXCLK  
TXEN  
TXD0  
TXD1  
TXD2  
TXD3  
COL  
37  
38  
39  
40  
41  
42  
43  
44  
Transmit Clock  
Transmit Enable  
Transmit Data 0  
Transmit Data 1  
Transmit Data 2  
Transmit Data 3  
Collision Detect  
Carrier Sense  
CRS  
Table 8-2. ICS 1893BF Multifunction Pins: PHY Address and LED Pins  
Signal Name  
P4RD  
Pin No.  
Signal Description  
8
6
4
3
1
Bit 4 of PHY Address, PHYAD[4], OR Receive LED  
Bit 3 of PHY Address, PHYAD[3], OR Transmit LED  
Bit 2 of PHY Address, PHYAD[2], OR Link Integrity LED  
Bit 1 of PHY Address, PHYAD[1], OR Collision LED  
Bit 0 of PHY Address, PHYAD[0], OR Activity LED  
P3TD  
P2LI  
P1CL  
P0AC  
Table 8-3. ICS1893BF Configuration Pins  
Signal Name  
10/100  
Pin No.  
Signal Description  
Output Indication, High=100baseTX Operation  
Auto-MDIX Enable (built-in internal 50K Ohm pull-up)  
100M Transmit Current Set Resistors  
9
AMDIX_EN  
100TCSR  
10TCSR  
10  
20  
19  
10M Transmit Current Set Resistor  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
91  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Table 8-3. ICS1893BF Configuration Pins  
Signal Name  
REF_IN  
Pin No.  
47  
Signal Description  
Frequency Reference Input: 25 MHz Input Clock or Crystal  
Frequency Reference Output for Crystal  
System Reset (active low)  
REF_OUT  
RESETn  
46  
23  
8.2.1 Transformer Interface Pins  
Transformer connections on the ICS1893BF signals TP_AP, TP_AN, TP_BP and TP_BN are shown in  
Table 8.4. The previous TP_CT pin on the ICS1893AF is not used with the ICS1893BF. The typical Twisted  
Pair Transformers connections are shown in Chapter 5. The transformer must be 1:1 ratio and symetrical  
for 10/100 MDI/MDIX applications since the transmit twisted pair and receive twisted pair are  
interchangeable. ICS1893 PHYs do not have power connections to the transformer. All transformer power  
is supplied by the ICS1893. Note the twisted pair are polarity sensitive and must connect to the RJ45 with  
the same polarity as shown in the figure.  
Table 8-4 lists the pins for the transformer interface group of pins.  
Table 8-4. ICS1893BF Transformer Interface Pins  
Signal Name  
TP_AP  
Pin No.  
12  
Signal Description  
Twisted Pair A Positive  
Twisted Pair A Negative  
Twisted Pair B Positive  
Twisted Pair B Negative  
TP_AN  
13  
TP_BP  
16  
TP_BN  
15  
8.2.2 Multi-Function (Multiplexed) Pins: PHY Address and LED Pins  
Table 8-5 lists the pins for the multi-function group of pins (that is, the multiplexed PHY Address / LED pins).  
Note:  
1. During either a power-on reset or a hardware reset, each multi-function configuration pin is an input  
that is sampled when the ICS1893BF exits the reset state. After sampling is complete, these pins are  
output pins that can drive status LEDs.  
2. A software reset does not affect the state of a multi-function configuration pin. During a software reset,  
all multi-function configuration pins are outputs.  
3. Each multi-function configuration pin must be pulled either up or down with a resistor to establish the  
address of the ICS1893BF. LEDs placed in series with these resistors provide a designated status  
indicator.  
Caution: All pins listed in Table 8-5 must not float.  
4. As outputs, the asserted state of a multi-function configuration pin is the inverse of the sense sampled  
during reset. This inversion provides a signal that can illuminate an LED during an asserted state. For  
example, if a multi-function configuration pin is pulled down to ground through an LED and a  
current-limiting resistor, then the sampled sense of the input is low. To illuminate an LED for the  
asserted state requires the output to be high.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
92  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Note: Each of these pins monitor the data link by providing signals that directly drive LEDs.  
Table 8-5. PHY Address and LED Pins  
Pin  
Pin  
Pin  
Pin Description  
Name Number  
Type  
P0AC 1  
Input or PHY (Address Bit) 0 / Activity LED.  
Output For more information on this pin, see Section 5.5, “Status Interface”.  
• This multi-function configuration pin is:  
– An input pin during either a power-on reset or a hardware reset. In  
this case, this pin configures the ICS1893BF PHY address Bit 0.  
– An output pin following reset. In this case, this pin provides indication  
of Receive “OR” Transmit activity.  
As an input pin:  
• This pin establishes the address for the ICS1893BF. When the signal  
on this pin is logic:  
– Low, that address bit is set to logic zero.  
– High, that address bit is set to logic one.  
As an output pin:  
• When the signal on this pin is:  
– De-asserted, this state indicates the ICS1893BF does not have  
activity.  
– Asserted, this state indicates the ICS1893BF has activity.  
Caution: This pin must not float. (See the notes at Section 8.2.2,  
“Multi-Function (Multiplexed) Pins: PHY Address and LED  
Pins”.)  
P1CL  
3
Input or PHY (Address Bit) 1 / Collision LED.  
Output For more information on this pin, see Section 5.5, “Status Interface”.  
• This multi-function configuration pin is:  
– An input pin during either a power-on reset or a hardware reset. In  
this case, this pin configures the ICS1893BF PHY Address Bit 1.  
– An output pin following reset. In this case, this pin provides collision  
status for the ICS1893BF.  
As an input pin:  
• This pin establishes the address for the ICS1893BF. When the signal  
on this pin is Logic:  
– Low, that address bit is set to logic zero.  
– High, that address is set to logic one.  
As an output pin:  
• When the signal on this pin is:  
– De-asserted, this state indicates the ICS1893BF does not detect any  
collisions.  
– Asserted, this state indicates the ICS1893BF detects collisions.  
• The ICS1893BF asserts its Collision LED for a period of approximately  
70 msec when it detects a collision.  
Caution: This pin must not float. (See the notes at Section 8.2.2,  
“Multi-Function (Multiplexed) Pins: PHY Address and LED  
Pins”.)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
93  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Table 8-5. PHY Address and LED Pins  
Pin  
Pin  
Pin  
Pin Description  
Name Number  
Type  
P2LI  
4
Input or PHY (Address Bit) 2 / Link Integrity LED.  
Output For more information on this pin, see Section 5.5, “Status Interface”.  
• This multi-function configuration pin is:  
– An input pin during either a power-on reset or a hardware reset. In  
this case, this pin configures the address of the ICS1893BF PHY  
Address Bit 2.  
– An output pin following reset. In this case, this pin provides link status  
for the ICS1893BF.  
As an input pin:  
• This pins establishes the address for the ICS1893BF. When the signal  
on this pin is logic:  
– Low, that address bit is set to logic zero.  
– High, that address bit is set to logic one.  
As an output pin:  
• When the signal on this pin is:  
– De-asserted, this state indicates the ICS1893BF does not have a  
link.  
– Asserted, this state indicates the ICS1893BF has a valid link.  
Caution: This pin must not float. (See the notes at Section 8.2.2,  
“Multi-Function (Multiplexed) Pins: PHY Address and LED  
Pins”.)  
P3TD  
6
Input or PHY (Address Bit) 3 / Transmit Data LED.  
Output For more information on this pin, see Section 5.5, “Status Interface”.  
• These multi-function configuration pins are:  
– Input pins during either a power-on reset or a hardware reset. In this  
case, these pins configure the address of the ICS1893BF PHY  
Address Bit 3.  
– Output pins following reset. In this case, this pin provides indication  
of Transmit activity.  
As an input pin:  
• This pin establishes the address for the ICS1893BF. When the signal  
on one of these pins is logic:  
– Low, that address bit is set to logic zero.  
– High, that address bit is set to logic one.  
As an output pin:  
• When the signal on this pin is:  
– De-asserted, this state indicates the ICS1893BF does not have  
Transmit activity.  
– Asserted, this state indicates the ICS1893BF has Transmit activity.  
Caution: This pin must not float. (See the notes at Section 8.2.2,  
“Multi-Function (Multiplexed) Pins: PHY Address and LED  
Pins”.)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
94  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Table 8-5. PHY Address and LED Pins  
Pin  
Pin  
Pin  
Pin Description  
Name Number  
Type  
P4RD  
8
Input or PHY (Address Bit) 4 / Receive Data LED.  
Output For more information on this pin, see Section 5.5, “Status Interface”.  
• This multi-function configuration pin is:  
– An input pin during either a power-on reset or a hardware reset. In  
this case, this pin configures the ICS1893BF when it is in either  
hardware mode or software mode.  
– An output pin following reset. In this case, this pin provides activity  
status of the ICS1893.  
An an input pin:  
• This pin establishes the address for the ICS1893BF. When the signal  
on this pin is logic:  
– Low, that address bit is set to logic zero.  
– High, that address bit is set to logic one.  
As an output pin:  
• When the signal on this pin is:  
– De-asserted, this state indicates the ICS1893BF does not have  
Receive activity.  
– Asserted, this state indicates the ICS1893BF has Receive activity.  
Caution: This pin must not float. (See the notes at Section 8.2.2,  
“Multi-Function (Multiplexed) Pins: PHY Address and LED  
Pins”.)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
95  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.2.3 Configuration Pins  
Table 8-6 lists the configuration pins.  
Table 8-6. Configuration Pins  
Pin  
Pin  
Pin  
Pin Description  
Name  
Number  
Type  
10/100SEL  
9
Output 10Base-T / 100Base-TX Select.  
• This pin acts as an output that indicates the current status of this  
pin. In this case, when the signal on this pin is logic:  
– Low, this pin indicates 10Base-T operations are selected.  
– High, this pin indicates 100Base-TX operations are selected.  
10TCSR  
19  
20  
Output 10M Transmit Current Set Resistor.  
• A resistor, connected between this pin and ground, is required to  
establish the value of the transmit current used in 10Base-T mode.  
• The value and tolerance of this resistor is specified in Section 9.3,  
“Recommended Component Values”.  
100TCSR  
Output 100M Transmit Current Set Resistor.  
• A resistor, connected between this pin and ground, is required to  
establish the value of the transmit current used in 100Base-TX  
mode.  
• The value and tolerance of this resistor is specified in Section 9.3,  
“Recommended Component Values”.  
REF_IN  
47  
Input  
(Frequency) Reference Input.  
This pin is connected to a 25-MHz oscillator. For a tolerance, see  
Section 9.5.1, “Timing for Clock Reference In (REF_IN) Pin”.  
REF_OUT  
RESETn  
46  
23  
Output (Frequency) Reference Output.  
This pin is used with a crystal.  
Input  
(System) Reset (Active Low).  
• When the signal on this active-low pin is logic:  
– Low, the ICS1893BF is in hardware reset.  
– High, the ICS1893BF is operational.  
• For more information on hardware resets, see the following:  
– Section 4.1.2.1, “Hardware Reset”  
– Section 9.5.16, “Reset: Hardware Reset and Power-Down”  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
96  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.2.4 MAC Interface Pins  
This section lists pin descriptions for each of the following interfaces  
• Section 8.2.4.1, “MAC Interface Pins for Media Independent Interface”  
8.2.4.1 MAC Interface Pins for Media Independent Interface  
Table 8-7 lists the MAC Interface pin descriptions for the MII.  
Table 8-7. MAC Interface Pins: Media Independent Interface (MII)  
Pin  
Pin  
Pin  
Pin Description  
Name Number  
Type  
COL  
43  
Output Collision (Detect).  
The ICS1893BF asserts a signal on the COL pin when the ICS1893BF  
detects receive activity while transmitting (that is, while the TXEN signal is  
asserted by the MAC, that is, when transmitting). When the mode is:  
• 10Base-T, the ICS1893BF detects receive activity by monitoring the  
un-squelched MDI receive signal.  
• 100Base-TX, the ICS1893BF detects receive activity when there are  
two non-contiguous zeros in any 10-bit symbol derived from the MDI  
receive data stream.  
Note:  
1. The signal on the COL pin is not synchronous to either RXCLK or  
TXCLK.  
2. In full-duplex mode, the COL signal is disabled and always remains  
low.  
3. The COL signal is asserted as part of the signal quality error (SQE)  
test. This assertion can be suppressed with the SQE Test Inhibit bit (bit  
18.2).  
CRS  
44  
27  
Output Carrier Sense.  
When the ICS1893BF mode is:  
• Half-duplex, the ICS1893BF asserts a signal on its CRS pin when it  
detects either receive or transmit activity.  
• Either full-duplex or Repeater mode, the ICS1893BF asserts a signal  
on its CRS pin only in response to receive activity.  
Note: The signal on the CRS pin is not synchronous to the signal on  
either the RXCLK or TXCLK pin.  
MDC  
Input  
Management Data Clock.  
The ICS1893BF uses the signal on the MDC pin to synchronize the  
transfer of management information between the ICS1893BF and the  
Station Management Entity (STA), using the serial MDIO data line. The  
MDC signal is sourced by the STA.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
97  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Table 8-7. MAC Interface Pins: Media Independent Interface (MII) (Continued)  
Pin  
Pin  
Pin  
Pin Description  
Name Number  
Type  
MDIO  
26  
Input/ Management Data Input/Output.  
Output The signal on this pin can be tri-stated and can be driven by one of the  
following:  
• A Station Management Entity (STA), to transfer command and data  
information to the registers of the ICS1893BF.  
• The ICS1893BF, to transfer status information.  
All transfers and sampling are synchronous with the signal on the MDC  
pin.  
Note: If the ICS1893BF is to be used in an application that uses the  
mechanical MII specification, MDIO must have a 1.5 kΩ ±5%  
pull-up resistor at the ICS1893BF end and a 2 kΩ ±5% pull-down  
resistor at the station management end. (These resistors enable  
the station management to determine if the connection is intact.)  
RXCLK  
34  
Output Receive Clock.  
The ICS1893BF sources the RXCLK to the MAC interface. The  
ICS1893BF uses RXCLK to synchronize the signals on the following pins:  
RXD[3:0], RXDV, and RXER. The following table contrasts the behavior  
on the RXCLK pin when the mode for the ICS1893BF is either 10Base-T  
or 100Base-TX.  
10Base-T  
100Base-TX  
The RXCLK frequency is 2.5  
MHz.  
The RXCLK frequency is 25 MHz.  
The ICS1893BF generates its  
The ICS1893BF generates its  
RXCLK from the MDI data stream RXCLK from the MDI data stream  
using a digital PLL. When the MDI while there is a valid link (that is,  
data stream terminates, the PLL  
continues to operate,  
synchronously referenced to the  
last packet received.  
either data or IDLEs). In the  
absence of a link, the ICS1893BF  
uses the REF_IN clock to  
generate the RXCLK.  
The ICS1893BF switches  
While the ICS1893BF is bringing  
between clock sources during the up a link, a clock phase change of  
period between when its CRS is  
asserted and prior to its RXDV  
being asserted. While the  
ICS1893BF is locking onto the  
incoming data stream, a clock  
phase change of up to 360  
degrees can occur.  
up to 360 degrees can occur.  
The RXCLK aligns once per  
packet.  
The RXCLK aligns once, when  
the link is being established.  
Note: The signal on the RXCLK pin is conditioned by the RXTRI pin.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
98  
ICS1893BF Data Sheet Rev. F - Release  
Table 8-7. MAC Interface Pins: Media Independent Interface (MII) (Continued)  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Pin  
Pin  
Pin  
Pin Description  
Name Number  
Type  
RXD0  
RXD1  
RXD2  
RXD3  
31  
30  
29  
28  
Output Receive Data 0–3.  
• RXD0 is the least-significant bit and RXD3 is the most-significant bit of  
the MII receive data nibble.  
• While the ICS1893BF asserts RXDV, the ICS1893BF transfers the  
receive data signals on the RXD0–RXD3 pins to the MAC Interface  
synchronously on the rising edges of RXCLK.  
RXDV  
32  
Output Receive Data Valid.  
The ICS1893BF asserts RXDV to indicate to the MAC that data is  
available on the MII Receive Bus (RXD[3:0]). The ICS1893BF:  
• Asserts RXDV after it detects and recovers the Start-of-Stream  
delimiter, /J/K/. (For the timing reference, see Chapter 9.5.6,  
“100M/MII Media Independent Interface: Synchronous Receive  
Timing”.)  
• De-asserts RXDV after it detects either the End-of-Stream delimiter  
(/T/R/) or a signal error.  
Note: RXDV is synchronous with the Receive Data Clock, RXCLK.  
RXER  
35  
Output Receive Error.  
When the MAC Interface is in:  
• 10M MII mode, RXER is not used.  
• 100M MII mode, the ICS1893BF asserts a signal on the RXER pin  
when either of the following two conditions are true:  
– Errors are detected during the reception of valid frames  
– A False Carrier is detected  
Note:  
1. An ICS1893BF asserts a signal on the RXER pin upon detection of a  
False Carrier so that repeater applications can prevent the  
propagation of a False Carrier.  
2. The RXER signal always transitions synchronously with RXCLK.  
3. The signal on RXER pin is conditioned by the RXTRI pin.  
TXCLK  
37  
Output Transmit Clock.  
The ICS1893BF generates this clock signal to synchronize the transfer of  
data from the MAC Interface to the ICS1893BF. When the mode is:  
• 10Base-T, the TXCLK frequency is 2.5 MHz.  
• 100Base-TX, the TXCLK frequency is 25 MHz.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
99  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Table 8-7. MAC Interface Pins: Media Independent Interface (MII) (Continued)  
Pin  
Pin  
Pin  
Pin Description  
Name Number  
Type  
TXD0  
TXD1  
TXD2  
TXD3  
39  
40  
41  
42  
Input  
Transmit Data 0–3.  
• TXD0 is the least-significant bit and TXD3 is the most-significant bit of  
the MII transmit data nibble received from the MAC.  
• The ICS1893BF samples its TXEN signal to determine when data is  
available for transmission. When TXEN is asserted, the signals on a  
the TXD[3:0] pins are sampled synchronously on the rising edges of  
the TXCLK signal.  
TXEN  
38  
Input  
Transmit Enable.  
In MII mode:  
• The ICS1893BF samples its TXEN signal to determine when data is  
available for transmission. When TXEN is asserted, the ICS1893BF  
begins sampling the data nibbles on the transmit data lines TXD[3:0]  
synchronously with TXCLK. The ICS1893BF then transmits this data  
over the media.  
• Following the de-assertion of TXEN, the ICS1893BF terminates  
transmission of nibbles over the media.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
100  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.2.5 Ground and Power Pins  
Table 8-8. Ground and Power Pins  
Signal Name  
Pin No.  
Signal Description  
Power  
3.3V  
VDD  
VDD  
VDD  
VDD  
VDD  
VDD  
VDD  
VDD  
7
14  
18  
22  
24  
33  
45  
48  
3.3V  
3.3V  
3.3V  
3.3V  
3.3V  
3.3V  
3.3V  
Ground  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
2
5
11  
17  
21  
25  
36  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
101  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.3 ICS1893BK Pin Diagram with MDIX Pinout (56L, 8x8 MLF2)  
10/100  
AMDIX_EN  
VSS  
1
2
42  
41  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
TXD3  
TXD2  
TXD1  
TXD0  
TXEN  
TXCLK  
VSS  
3
TP_AP  
TP_AN  
VDD  
4
5
6
VDD  
7
ICS1893BK  
8x8 56L MLF2  
TP_BN  
TP_BP  
VSS  
8
RXER  
RXCLK  
VDD  
9
10  
11  
12  
13  
14  
VDD_A  
10TCSR  
100TCSR  
VSS  
RXDV  
RXD0  
RXD1  
RXD2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
102  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.3.1 ICS1893BK Pin Descriptions  
The ICS1893BK Pin Signal Descriptions are identical in function to the ICS1893BF except for the Pin  
Numbers. See section 8.1 for descriptions.  
Table 8-9. ICS1893BK MAC Interface Pins  
Signal Name  
MDIO  
MDC  
Pin No.  
26  
Description  
Management Data Input/Output  
Management Data Clock  
Receive Data 3  
Receive Data 2  
Receive Data 1  
Receive Data 0  
Receive Data Valid  
Receive Clock  
27  
RXD3  
RXD2  
RXD1  
RXD0  
RXDV  
RXCLK  
RXER  
TXCLK  
TXEN  
TXD0  
28  
29  
30  
31  
32  
34  
35  
Receive Error  
37  
Transmit Clock  
38  
Transmit Enable  
Transmit Data 0  
Transmit Data 1  
Transmit Data 2  
Transmit Data 3  
Collision Detect  
Carrier Sense  
39  
TXD1  
40  
TXD2  
41  
TXD3  
42  
COL  
43  
CRS  
44  
Table 8-10. ICS1893BK Multifunction Pins: PHY Address and LED Pins  
Signal Name  
P4RD  
Pin No.  
56  
Signals Description  
PHYAD[4] / Receive LED  
PHYAD[3] / Transmit LED  
PHYAD[2] / Link LED  
P3TD  
54  
P2LI  
52  
P1CL  
51  
PHYAD[1] / Collision LED  
PHYAD[0] / Activity LED  
P0AC  
49  
Table 8-11. ICS1893BK Configuration Pins  
Signal Name  
10/100  
Pin No.  
Signals Description  
1
2
Output Speed indication, High=100baseTX  
Auto-MDIX Enable (built-in internal 50K Ohm pull-up)  
10M Transmit Amplitude Current Set Resistor  
100M Transmit Amplitude Current Set Resistor  
AMDIX_EN  
10TCSR  
12  
13  
100TCSR  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
103  
ICS1893BF Data Sheet - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
Table 8-11. ICS1893BK Configuration Pins  
Signal Name  
REF_IN  
Pin No.  
47  
Signals Description  
Frequency Ref Input: 25MHz Clock or Crystal  
Frequency Ref Output for Crystal  
System Reset (active low)  
REF_OUT  
RESETn  
46  
17  
8.3.2 Transformer Interface Pins  
Transformer connections on the ICS1893BK signals TP_AP, TP_AN, TP_BP and TP_BN are shown in  
Table 8-12. The previous TP_CT pin used on the ICS1893AF is not used with the ICS1893BK. The typical  
Twisted Pair Transformers connections are shown in Chapter 5. The transformer must be 1:1 ratio and  
symetrical for 10/100 MDI/MDIX applications since the transmit twisted pair and receive twisted pair are  
interchangeable. ICS1893 PHYs do not have power connections to the Transformer. All transformer power  
is supplied by the ICS1893BK.  
Note the twisted pairs are polarity sensitive and must connect to the RJ45 with the same polarity as shown  
in the figure. Pay particular attention to polarity of the the “B” pair being reversed in pad sequence.  
Table 8-12. ICS1893BK Transformer Interface Pins  
Signal Name  
TP_AP  
Pin No.  
Signals Description  
Twisted Pair A Positive  
Twisted Pair A Negative  
Twisted Pair B Positive  
Twisted Pair B Negative  
4
5
9
8
TP_AN  
TP_BP  
TP_BN  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
104  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 8 Pin Diagram, Listings, and Descriptions  
8.3.3 Ground and Power Pins  
Table 8-13. ICS1893BK Ground and Power Pins  
Signal Name  
VDD  
Pin No.  
6
Signals Description  
Power 3.3V  
Power 3.3V  
Power 3.3V  
Power 3.3V  
Power 3.3V  
Power 3.3V  
Power 3.3V  
Power 3.3V  
Power 3.3V  
VDD  
7
VDD  
11  
VDD  
15  
VDD  
23  
VDD  
33  
VDD  
45  
VDD  
48  
VDD  
55  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
VSS  
3
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
Ground  
10  
14  
16  
18  
19  
20  
21  
22  
24  
25  
36  
50  
53  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
105  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
Chapter 9 DC and AC Operating Conditions  
9.1 Absolute Maximum Ratings  
Table 9-1 lists absolute maximum ratings. Stresses above these ratings can permanently damage the  
ICS1893BF. These ratings, which are standard values for IDT commercially rated parts, are stress ratings  
only. Functional operation of the ICS1893BF at these or any other conditions above those indicated in the  
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions  
for extended periods can affect product reliability. Electrical parameters are guaranteed only over the range  
of the recommended operating temperature.  
Table 9-1. Absolute Maximum Ratings for ICS1893BF  
Item  
Rating  
VDD (measured to VSS)  
Digital Inputs / Outputs  
Storage Temperature  
Junction Temperature  
Soldering Temperature  
Power Dissipation  
-0.3 V to 3.6V  
-0.3 V to VDD +0.3 V  
-55° C to +150° C  
125° C  
260° C  
See Section 9.4.1, “DC Operating Characteristics for Supply Current”  
9.2 Recommended Operating Conditions  
Table 9-2. Recommended Operating Conditions for ICS1893BF  
Parameter  
Symbols  
Min. Max. Units  
Ambient Operating Temperature - Commercial  
Ambient Operating Temperature - Industrial  
Power Supply Voltage (measured to VSS)  
T
0
+70  
+85  
°C  
°C  
V
A
T
-40  
A
VDD  
+3.14 +3.47  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
106  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.3 Recommended Component Values  
Table 9-3. Recommended Component Values for ICS1893BF  
Parameter  
Minimum  
Typical  
Maximum  
Tolerance  
Units  
MHz  
Ω
Oscillator Frequency  
10TCSR Resistor Value  
100TCSR Resistor Value  
LED Resistor Value  
–
–
25  
2.00k  
–
–
± 50 ppm †  
1%  
1%  
–
–
See Figure 9-1  
1k  
–
Ω
510  
10k  
Ω
† There are two IEEE Std. 802.3 requirements that drive the tolerance for the frequency of the oscillator.  
• Clause 22.2.2.1 requires the MII TX_CLK to have an accuracy of ± 100 ppm.  
• Clause 24.2.3.4 is more stringent. It requires the code-bit timer to have an accuracy of 0.005% (that is, ±50 ppm).  
Figure 9-1. ICS1893BF 10TCSR and 100TCSR  
Typical Board Layouts  
10TCSR and 100TCSR Bias Resistors  
ICS1893BF  
VDD  
18  
10TCSR  
19  
100TCSR  
20  
12.1 KΩ 1%  
VDD  
10TCSR  
100TCSR  
1.54KΩ 1%  
2.0KΩ 1%  
Note:  
1. The bias resistor networks set the 10baseT and 100baseTX output amplitude levels.  
2. Amplitude is directly related to current sourced out of the 10TCSR and 100TCSR pins.  
3. Resistor values shown above are typical. User should check amplitudes and adjust for transformer.  
4. The VDD connection to the 12.1K resistor can connect to any VDD. The 12.1K resistor provides  
negative feedback to compensate for VDD changes. Lowering the 12.1K value will lower the  
100baseT amplitude.  
5. The ICS1893BF 10baseT amplitude is below the IEEE spec but is adequate for 200m operation. This  
is the effect of additional MUXes added for the Auto-MDIX function.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
107  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.4 DC Operating Characteristics  
This section lists the ICS1893BF DC operating characteristics.  
9.4.1 DC Operating Characteristics for Supply Current  
Table 9-4 lists the DC operating characteristics for the supply current to the ICS1893BF under various  
conditions.  
Note: All VDD_IO measurements are taken with respect to VSS (which equals 0 V).  
Table 9-4. DC Operating Characteristics for Supply Current  
Parameter  
Operating Mode  
100Base-TX‡  
Symbol  
IDD_IO  
Min. Typ.  
Max. Units  
Supply Current†  
–
–
–
–
–
–
–
–
–
8
110  
5
11  
125  
8
mA  
mA  
mA  
mA  
mA  
mA  
mA  
mA  
mA  
IDD  
Supply Current†  
Supply Current†  
Supply Current†  
Supply Current†  
10Base-T‡  
Auto-Negotiation  
Power-Down  
Reset  
IDD_IO  
IDD  
150  
5
160  
8
IDD_IO  
IDD  
80  
3
90  
5
IDD_IO  
IDD  
4
5
IDD  
10  
11  
† These supply current parameters are measured through VDD pins to the ICS1893BF. The supply current  
parameters include external transformer currents.  
‡ Measurements taken with 100% data transmission and the minimum inter-packet gap.  
9.4.2 DC Operating Characteristics for TTL Inputs and Outputs  
Table 9-5 lists the 3.3-V DC operating characteristics of the ICS1893BF TTL inputs and outputs.  
Note: All VDD_IO measurements are taken with respect to VSS (which equals 0 V).  
Table 9-5. 3.3-V DC Operating Characteristics for TTL Inputs and Outputs  
Parameter  
Symbol  
Conditions  
VDD_IO = 3.47 V  
Min. Max. Units  
TTL Input High Voltage  
TTL Input Low Voltage  
TTL Output High Voltage  
TTL Output Low Voltage  
V
–
2.0  
–
–
0.8  
–
V
V
V
V
V
IH  
V
VDD_IO = 3.47 V  
VDD_IO = 3.14 V  
VDD_IO = 3.14 V  
VDD_IO = 3.14 V  
–
IL  
V
I
= –4 mA  
= +4 mA  
= –4 mA  
2.4  
–
OH  
OH  
V
I
0.4  
–
OL  
OL  
TTL Driving CMOS,  
Output High Voltage  
V
I
2.4  
OH  
OH  
TTL Driving CMOS,  
Output Low Voltage  
V
VDD_IO = 3.14 V  
I
= +4 mA  
OL  
–
0.4  
V
OL  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
108  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.4.3 DC Operating Characteristics for REF_IN  
Table 9-6 lists the 3.3-V DC characteristics for the REF_IN pin.  
Note: The REF_IN input switch point is 50% of VDD.  
Table 9-6. 3.3-V DC Operating Characteristics for REF_IN  
Parameter  
Symbol  
Test Conditions  
VDD_IO = 3.47 V  
VDD_IO = 3.14 V  
Min.  
2.97  
–
Max.  
–
Units  
Input High Voltage  
Input Low Voltage  
V
V
V
IH  
V
0.33  
IL  
9.4.4 DC Operating Characteristics for Media Independent Interface  
Table 9-7 lists DC operating characteristics for the Media Independent Interface (MII) for the ICS1893BF.  
Table 9-7. DC Operating Characteristics for Media Independent Interface  
Parameter  
Conditions  
Minimum  
Typical  
Maximum  
Units  
pF  
MII Input Pin Capacitance  
MII Output Pin Capacitance  
MII Output Drive Impedance  
–
–
–
–
–
–
8
14  
–
–
pF  
VDD_IO = 3.3V  
60  
Ω
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
109  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5 Timing Diagrams  
9.5.1 Timing for Clock Reference In (REF_IN) Pin  
Table 9-8 lists the significant time periods for signals on the clock reference in (REF_IN) pin. Figure 9-2  
shows the timing diagram for the time periods.  
Note: The REF_IN switching point is 50% of VDD.  
Table 9-8. REF_IN Timing  
Time  
Parameter  
Conditions  
Min.  
Typ.  
Max. Units  
Period  
t1  
t2  
REF_IN Duty Cycle  
REF_IN Period  
–
–
45  
–
50  
40  
55  
–
%
ns  
Figure 9-2. REF_IN Timing Diagram  
t1  
REF_IN  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
110  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.2 Timing for Transmit Clock (TXCLK) Pins  
Table 9-9 lists the significant time periods for signals on the Transmit Clock (TXCLK) pins for the various  
interfaces. Figure 9-3 shows the timing diagram for the time periods.  
Table 9-9. Transmit Clock Timing  
Time  
Parameter  
Conditions  
Min. Typ. Max. Units  
Period  
t1  
TXCLK Duty Cycle  
TXCLK Period  
–
100M MII (100Base-TX)  
10M MII (10Base-T)  
35  
–
50  
40  
65  
–
%
ns  
ns  
t2a  
t2b  
TXCLK Period  
–
400  
–
Figure 9-3. Transmit Clock Timing Diagram  
t1  
TXCLK  
t2x  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
111  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.3 Timing for Receive Clock (RXCLK) Pins  
Table 9-10 lists the significant time periods for signals on the Receive Clock (RXCLK) pins for the various  
interfaces. Figure 9-4 shows the timing diagram for the time periods.  
Table 9-10. MII Receive Clock Timing  
Time  
Parameter  
Conditions  
Min. Typ. Max. Units  
Period  
t1  
RXCLK Duty Cycle  
RXCLK Period  
RXCLK Period  
–
100M MII (100Base-TX)  
10M MII (10Base-T)  
35  
–
50  
40  
65  
–
%
ns  
ns  
t2a  
t2b  
–
400  
–
Figure 9-4. Receive Clock Timing Diagram  
t1  
RXCLK  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
112  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.4 100M MII: Synchronous Transmit Timing  
Table 9-11 lists the significant time periods for the 100M MII Interface synchronous transmit timing. The  
time periods consist of timings of signals on the following pins:  
• TXCLK  
• TXD[3:0]  
• TXEN  
• TXER  
Figure 9-5 shows the timing diagram for the time periods.  
Table 9-11. 100M MII / 100M Stream Interface: Synchronous Transmit Timing  
Time  
Parameter  
Conditions  
Min.  
Typ.  
Max. Units  
Period  
t1  
t2  
TXD[3:0], TXEN, TXER Setup to TXCLK Rise  
TXD[3:0], TXEN, TXER Hold after TXCLK Rise  
–
–
15  
0
–
–
–
–
ns  
ns  
Figure 9-5. 100M MII / 100M Stream Interface Synchronous Transmit Timing Diagram  
TXCLK  
TXD[3:0]  
TXEN  
TXER  
t1  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
113  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.5 10M MII: Synchronous Transmit Timing  
Table 9-12 lists the significant time periods for the 10M MII synchronous transmit timing. The time periods  
consist of timings of signals on the following pins:  
• TXCLK  
• TXD[3:0]  
• TXEN  
• TXER  
Figure 9-6 shows the timing diagram for the time periods.  
Table 9-12. 10M MII: Synchronous Transmit Timing  
Time  
Parameter  
Conditions  
Min.  
Typ.  
Max. Units  
Period  
t1  
t2  
TXD[3:0], TXEN, TXER Setup to TXCLK Rise  
TXD[3:0], TXEN, TXER Hold after TXCLK Rise  
–
–
375  
0
–
–
–
–
ns  
ns  
Figure 9-6. 10M MII Synchronous Transmit Timing Diagram  
TXCLK  
TXD[3:0]  
TXEN  
TXER  
t1  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
114  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.6 100M/MII Media Independent Interface: Synchronous Receive Timing  
Table 9-13 lists the significant time periods for the MII / 100M Stream Interface synchronous receive timing.  
The time periods consist of timings of signals on the following pins:  
• RXCLK  
• RXD[3:0]  
• RXDV  
• RXER  
Figure 9-7 shows the timing diagram for the time periods.  
Table 9-13. MII Interface: Synchronous Receive Timing  
Time  
Parameter  
Min.  
Typ.  
Max. Units  
Period  
t1  
t2  
RXD[3:0], RXDV, and RXER Setup to RXCLK Rise  
RXD[3:0], RXDV, and RXER Hold after RXCLK Rise  
10.0  
10.0  
–
–
–
–
ns  
ns  
Figure 9-7. MII Interface Synchronous Receive Timing Diagram  
RXCLK  
RXD[3:0]  
RXDV  
RXER  
t1  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
115  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.7 MII Management Interface Timing  
Table 9-14 lists the significant time periods for the MII Management Interface timing (which consists of  
timings of signals on the MDC and MDIO pins). Figure 9-8 shows the timing diagram for the time periods.  
Table 9-14. MII Management Interface Timing  
Time  
Parameter  
Conditions Min.  
Typ.  
Max. Units  
Period  
t1  
t2  
t3  
t4  
t5  
t6  
MDC Minimum High Time  
–
–
–
–
–
–
160  
160  
400†  
0
–
–
†
–
–
–
–
–
ns  
ns  
ns  
ns  
ns  
ns  
MDC Minimum Low Time  
MDC Period  
–
MDC Rise Time to MDIO Valid  
MDIO Setup Time to MDC  
MDIO Hold Time after MDC  
300  
–
10  
10  
–
† The ICS1893BF is tested at 25 MHz (a 40-ns period) with a 50-pF load. Designs must account for all board loading  
of MDC.  
Figure 9-8. MII Management Interface Timing Diagram  
MDC  
t1  
t2  
t3  
t4  
MDIO  
(Output)  
MDC  
MDIO  
(Input)  
t5  
t6  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
116  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.8 10M Media Independent Interface: Receive Latency  
Table 9-15 lists the significant time periods for the 10M MII timing. The time periods consist of timings of  
signals on the following pins:  
• TP_RX (that is, the MII TP_RXP and TP_RXN pins)  
• RXCLK  
• RXD  
Figure 9-9 shows the timing diagram for the time periods.  
Table 9-15. 10M MII Receive Latency  
Time  
Period  
Parameter  
Conditions Min. Typ. Max.  
10M MII 6.5  
Units  
t1  
First Bit of /5/ on TP_RX to /5/D/ on RXD  
–
7
Bit times  
Figure 9-9. 10M MII Receive Latency Timing Diagram  
†
TP_RX  
RXCLK  
RXD  
5
5
5
D
t1  
†
Manchester  
encoding is  
not shown.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
117  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.9 10M Media Independent Interface: Transmit Latency  
Table 9-16 lists the significant time periods for the 10M MII transmit latency. The time periods consist of  
timings of signals on the following pins:  
• TXEN  
• TXCLK  
• TXD (that is, TXD[3:0])  
• TP_TX (that is, TP_TXP and TP_TXN)  
Figure 9-10 shows the timing diagram for the time periods.  
Table 9-16. 10M MII Transmit Latency Timing  
Time  
Period  
Parameter  
Conditions Min. Typ. Max.  
10M MII 1.2  
Units  
t1  
TXD Sampled to MDI Output of First Bit  
–
2
Bit times  
Figure 9-10. 10M MII Transmit Latency Timing Diagram  
TXEN  
TXCLK  
TXD  
5
5
5
†
TP_TX  
t1  
†
Manchester  
encoding is  
not shown.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
118  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.10 100M / MII Media Independent Interface: Transmit Latency  
Table 9-17 lists the significant time periods for the MII / 100 Stream Interface transmit latency. The time  
periods consist of timings of signals on the following pins:  
• TXEN  
• TXCLK  
• TXD (that is, TXD[3:0])  
• TP_TX (that is, TP_TXP and TP_TXN)  
Figure 9-11 shows the timing diagram for the time periods.  
Table 9-17. MII / 100M Stream Interface Transmit Latency  
Time  
Period  
Parameter  
Conditions  
Min. Typ. Max.  
2.8  
Units  
t1  
TXEN Sampled to MDI Output of First MII mode  
Bit of /J/ †  
–
3
Bit times  
† The IEEE maximum is 18 bit times.  
Figure 9-11. MII / 100M Stream Interface Transmit Latency Timing Diagram  
TXEN  
TXCLK  
TXD  
Preamble /J/  
Preamble /K/  
†
TP_TX  
t1  
†
Shown  
unscrambled.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
119  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.11 100M MII: Carrier Assertion/De-Assertion (Half-Duplex Transmission)  
Table 9-18 lists the significant time periods for the 100M MII carrier assertion/de-assertion during  
half-duplex transmission. The time periods consist of timings of signals on the following pins:  
• TXEN  
• TXCLK  
• CRS  
Figure 9-12 shows the timing diagram for the time periods.  
Table 9-18. 100M MII Carrier Assertion/De-Assertion (Half-Duplex Transmission Only)  
Time  
Period  
Parameter  
Condi- Min. Typ. Max. Units  
tions  
t1  
t2  
TXEN Sampled Asserted to CRS Assert  
TXEN De-Asserted to CRS De-Asserted  
0
0
3
3
4
4
Bit times  
Bit times  
Figure 9-12. 100M MII Carrier Assertion/De-Assertion Timing Diagram  
(Half-Duplex Transmission Only)  
t2  
TXEN  
TXCLK  
CRS  
t1  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
120  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.12 10M MII: Carrier Assertion/De-Assertion (Half-Duplex Transmission)  
Table 9-19 lists the significant time periods for the 10M MII carrier assertion/de-assertion during half-duplex  
transmission. The time periods consist of timings of signals on the following pins:  
• TXEN  
• TXCLK  
• CRS  
Figure 9-13 shows the timing diagram for the time periods.  
Table 9-19. 10M MII Carrier Assertion/De-Assertion (Half-Duplex Transmission Only)  
Time  
Period  
Parameter  
Condi- Min. Typ. Max. Units  
tions  
t1  
t2  
TXEN Asserted to CRS Assert  
0
0
–
2
2
4
Bit times  
Bit times  
TXEN De-Asserted to CRS De-Asserted  
Figure 9-13. 10M MII Carrier Assertion/De-Assertion Timing Diagram  
(Half-Duplex Transmission Only)  
t2  
TXEN  
TXCLK  
CRS  
t1  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
121  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.13 100M MII Media Independent Interface: Receive Latency  
Table 9-20 lists the significant time periods for the 100M MII / 100M Stream Interface receive latency. The  
time periods consist of timings of signals on the following pins:  
• TP_RX (that is, TP_RXP and TP_RXN)  
• RXCLK  
• RXD (that is, RXD[3:0])  
Figure 9-14 shows the timing diagram for the time periods.  
Table 9-20. 100M MII / 100M Stream Interface Receive Latency Timing  
Time  
Period  
Parameter  
Conditions  
Min. Typ. Max.  
16 17  
Units  
t1  
First Bit of /J/ into TP_RX to /J/ on RXD 100M MII  
–
Bit times  
Figure 9-14. 100M MII / 100M Stream Interface: Receive Latency Timing Diagram  
†
TP_RX  
RXCLK  
RXD  
t1  
†
Shown  
unscrambled.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
122  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.14 100M Media Independent Interface: Input-to-Carrier Assertion/De-Assertion  
Table 9-21 lists the significant time periods for the 100M MDI input-to-carrier assertion/de-assertion. The  
time periods consist of timings of signals on the following pins:  
• TP_RX (that is, TP_RXP and TP_RXN)  
• CRS  
• COL  
Figure 9-15 shows the timing diagram for the time periods.  
Table 9-21. 100M MDI Input-to-Carrier Assertion/De-Assertion Timing  
Time  
Parameter  
Conditions  
Min. Typ. Max.  
Units  
Period  
t1  
t2  
First Bit of /J/ into TP_RX to CRS Assert †  
–
10  
9
–
–
14 Bit times  
13 Bit times  
First Bit of /J/ into TP_RX while  
Half-Duplex Mode  
Transmitting Data to COL Assert †  
t3  
t4  
First Bit of /T/ into TP_RX to CRS  
De-Assert ‡  
–
13  
–
–
18 Bit times  
18 Bit times  
First Bit of /T/ Received into TP_RX to  
COL De-Assert ‡  
Half-Duplex Mode 13  
† The IEEE maximum is 20 bit times.  
‡ The IEEE minimum is 13 bit times, and the maximum is 24 bit times.  
Figure 9-15. 100M MDI Input to Carrier Assertion / De-Assertion Timing Diagram  
First bit  
First bit of /T/  
†
TP_RX  
t3  
t1  
CRS  
COL  
t4  
t2  
†
Shown  
unscrambled.  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
123  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.15 Reset: Power-On Reset  
Table 9-22 lists the significant time periods for the power-on reset. The time periods consist of timings of  
signals on the following pins:  
• VDD  
• TXCLK  
Figure 9-16 shows the timing diagram for the time periods.  
Table 9-22. Power-On Reset Timing  
Time  
Parameter  
Conditions  
Min.  
Typ.  
Max. Units  
Period  
t1  
VDD ≥ 2.7 V to Reset Complete  
–
40  
45  
500  
ms  
Figure 9-16. Power-On Reset Timing Diagram  
2.7 V  
VDD  
t1  
TXCLK  
Valid  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
124  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.16 Reset: Hardware Reset and Power-Down  
Table 9-23 lists the significant time periods for the hardware reset and power-down reset. The time periods  
consist of timings of signals on the following pins:  
• REF_IN  
• RESETn  
• TXCLK  
Figure 9-17 shows the timing diagram for the time periods.  
Table 9-23. Hardware Reset and Power-Down Timing  
Time  
Period  
Parameter  
Condi-  
tions  
Min. Typ. Max. Units  
t1  
t2  
t3  
RESETn Active to Device Isolation and Initialization  
Minimum RESETn Pulse Width  
–
–
–
–
500  
–
60  
40  
35  
–
–
ns  
ns  
RESETn Released to TXCLK Valid  
500  
ms  
Figure 9-17. Hardware Reset and Power-Down Timing Diagram  
REF_IN  
RESETn  
t1  
t2  
t3  
TXCLK Valid  
Power  
Consumption  
(AC only)  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
125  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.17 10Base-T: Heartbeat Timing (SQE)  
Table 9-24 lists the significant time periods for the 10Base-T heartbeat (that is, the Signal Quality Error).  
The time periods consist of timings of signals on the following pins:  
• TXEN  
• TXCLK  
• COL  
Figure 9-18 shows the timing diagram for the time periods.  
Note:  
1. For more information on 10Base-T SQE operations, see Section 6.5.10, “10Base-T Operation: SQE  
Test”.  
2. In 10Base-T mode, one bit time = 100 ns.  
Table 9-24. 10Base-T Heartbeat (SQE) Timing  
Time  
Parameter  
Conditions  
Min. Typ.  
Max. Units  
Period  
t1  
COL Heartbeat Assertion Delay from 10Base-T Half Duplex  
TXEN De-Assertion  
–
–
850  
1500  
ns  
ns  
t2  
COL Heartbeat Assertion Duration  
10Base-T Half Duplex  
1000 1500  
Figure 9-18. 10Base-T Heartbeat (SQE) Timing Diagram  
TXEN  
TXCLK  
COL  
t1  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
126  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.18 10Base-T: Jabber Timing  
Table 9-25 lists the significant time periods for the 10Base-T jabber. The time periods consist of timings of  
signals on the following pins:  
• TXEN  
• TP_TX (that is, TP_TXP and TP_TXN)  
• COL  
Figure 9-19 shows the timing diagram for the time periods.  
Note: For more information on 10Base-T jabber operations, see Section 6.5.9, “10Base-T Operation:  
Jabber”.  
Table 9-25. 10Base-T Jabber Timing  
Time  
Parameter  
Conditions  
Min.  
Typ.  
Max. Units  
Period  
t1  
t2  
Jabber Activation Time  
10Base-T Half Duplex  
10Base-T Half Duplex  
20  
–
–
35  
ms  
ms  
Jabber De-Activation Time  
300  
325  
Figure 9-19. 10Base-T Jabber Timing Diagram  
TXEN  
t1  
TP_TX  
COL  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
127  
ICS1893BF Data Sheet - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.19 10Base-T: Normal Link Pulse Timing  
Table 9-26 lists the significant time periods for the 10Base-T Normal Link Pulse (which consists of timings  
of signals on the TP_TXP pins). Figure 9-20 shows the timing diagram for the time periods.  
Table 9-26. 10Base-T Normal Link Pulse Timing  
Time  
Parameter  
Conditions  
Min. Typ. Max. Units  
Period  
t1  
t2  
Normal Link Pulse Width  
10Base-T  
–
8
100  
20  
–
ns  
Normal Link Pulse to Normal Link Pulse Period 10Base-T  
25  
ms  
Figure 9-20. 10Base-T Normal Link Pulse Timing Diagram  
TP_TXP  
t1  
t2  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
128  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 9 DC and AC Operating Conditions  
9.5.20 Auto-Negotiation Fast Link Pulse Timing  
Table 9-27 lists the significant time periods for the ICS1893BF Auto-Negotiation Fast Link Pulse. The time  
periods consist of timings of signals on the following pins:  
• TP_TXP  
• TP_TXN  
Figure 9-21 shows the timing diagram for one pair of these differential signals, for example TP_TXP minus  
TP_TXN.  
Table 9-27. Auto-Negotiation Fast Link Pulse Timing  
Time  
Parameter  
Conditions Min.  
Typ.  
Max.  
Units  
Period  
t1  
t2  
t3  
t4  
t5  
t6  
Clock/Data Pulse Width  
–
–
–
–
–
–
–
55  
110  
–
90  
60  
125  
5
–
70  
140  
–
ns  
µs  
Clock Pulse-to-Data Pulse Timing  
Clock Pulse-to-Clock Pulse Timing  
Fast Link Pulse Burst Width  
µs  
ms  
Fast Link Pulse Burst to Fast Link Pulse Burst  
Number of Clock/Data Pulses in a Burst  
10  
15  
15  
20  
25  
30  
ms  
pulses  
Figure 9-21. Auto-Negotiation Fast Link Pulse Timing Diagram  
Clock  
Pulse  
Data  
Pulse  
Clock  
Pulse  
Differential  
Twisted Pair  
Transmit Signal  
t1  
t1  
t3  
t2  
FLP Burst  
FLP Burst  
Differential  
Twisted Pair  
Transmit Signal  
t4  
t5  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
129  
ICS1893BF Data Sheet - Release  
Chapter 10 Physical Dimensions of ICS1893BF  
Chapter 10 Physical Dimensions of ICS1893BF Package  
Figure 10-1. ICS1893BF 300 mil SSOP Physical Dimensions  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
130  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 10 Physical Dimensions of ICS1893BF  
Figure 10-2. ICS1893BK Thermally Enhanced, Very Thin, Fine Pitch,  
Quad Flat / No Lead Plastic Package  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
131  
ICS1893BF Data Sheet - Release  
Chapter 11 Ordering Information  
Chapter 11 Ordering Information  
Figure 11-1. shows ordering information for the ICS1893BF.  
Part / Order Number  
ICS1893BFLF  
Marking  
1893BFLF  
1893BFLF  
1893BFILF  
1893BFILF  
1893BKLF  
1893BKLF  
1893BKILF  
1893BKILF  
Package  
Temperature  
48-Lead SSOP Lead/Pb-Free  
0° C to 70° C  
ICS1893BFLFT  
ICS1893BFILF  
ICS1893BFILFT  
ICS1893BKLF  
48-Lead SSOP Lead/Pb-Free, Tape and Reel  
48-Lead SSOP Lead/Pb-Free  
0° C to 70° C  
-40° C to 85° C  
-40° C to 85° C  
0° C to 70° C  
48-Lead SSOP Lead/Pb-Free, Tape and Reel  
56-Lead MLF2 Lead/Pb-Free  
ICS1893BKLFT  
ICS1893BKILF  
ICS1893BKILFT  
56-Lead MLF2 Lead/Pb-Free, Tape and Reel  
56-Lead MLF2 Lead/Pb-Free  
0° C to 70° C  
-40° C to 85° C  
-40° C to 85° C  
56-Lead MLF2 Lead/Pb-Free, Tape and Reel  
11.1 Marking Diagram  
Notes:  
1. Line 3: ###### = Lot number.  
2. Line 4: YYWW = Date code.  
3. Line 5: Origin  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
132  
ICS1893BF Data Sheet Rev. F - Release  
Chapter 11 Ordering Information  
Integrated Device Technology, Inc.  
Web Site:  
http://www.idt.com  
ICS1893BF, Rev. F, 5/13/10  
May, 2010  
Copyright © 2009, IDT, Inc.  
All rights reserved.  
133