5228-DS06-R [BOARDCOM]
10/100BASE-TX/FX Octal Transceiver;
| 型号： | 5228-DS06-R |
| 厂家： | 
Broadcom Corporation. |
| 描述： | 10/100BASE-TX/FX Octal Transceiver 局域网（LAN）标准 |
| 文件： | 总100页 (文件大小：1108K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
BCM5228
10/100BASE-TX/FX Octal-Φ™ Transceiver
GENERAL DESCRIPTION
FEATURES
The BCM5228 is an octal 10/100BASE-TX/FX
transceiver targeted at Fast Ethernet switches. The
device contains eight full-duplex 10BASE-T/100BASE-
TX/FX Fast Ethernet transceivers, each of which
perform all of the physical layer interface functions for
10BASE-T Ethernet on Category 3, 4, or 5 unshielded
twisted-pair (UTP) cable and 100BASE-TX Fast
Ethernet on Category 5 UTP cable. The 100BASE-FX is
supported at each port through the use of external fiber-
optic transmit and receive devices.
•
10BASE-T/100BASE-TX/FX IEEE 802.3u compliant
Single-chip octal physical interface-RMII to magnetics
Reduced Media Independent Interface (RMII)
Option-Serial Media Independent Interface (SMII)
Option-Source Synchronous SMII (S3MII)
Fully integrated digital adaptive equalizers
125-MHz clock generator and timing recovery
On-chip multimode transmit waveshaping
Edge-rate control eliminates external filters
Integrated baseline wander correction
HP Auto-MDIX
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•
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•
•
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The BCM5228 is a highly integrated solution combining
digital adaptive equalizers, ADCs, phase locked loops,
line drivers, encoders, decoders, and the required
support circuitry into a single monolithic CMOS chip. The
BCM5228 complies with the IEEE 802.3 specification,
including the auto-negotiation subsections.
Cable length indication
Cable noise level indication
IEEE 802.3υ-compliant auto-negotiation
Shared MII management interface up to 25 Mbps
Serial LED status pins
Programmable parallel LED pins
The effective use of digital technology in the BCM5228
design results in robust performance over a broad range
of operating scenarios. Problems inherent to mixed-
signal implementations (such as analog offset and on-
chip noise) are eliminated by employing field-proven
digital adaptive equalization and digital clock recovery
techniques.
Interrupt output capability
Loopback mode for diagnostics
IEEE 1149.1 (JTAG) and NAND chain ICT support
Low-power, dual-supply 2.5V/3.3V CMOS technology
Compatible with 2.5V/3.3V I/O
208-pin PQFP and 256-pin FPBGA packages
APPLICATIONS
•
Fast Ethernet switches
Multimode
Xmt DAC
TD± {1:8}
TXD{1:8}
10BASE-T
8
PCS
SSYNC
Auto-
MDIX
Baseline
Wander
SSSMII_TXC
Correction
100BASE-X
PCS
SSSMII_RSYNC
SSSMII_RXC
RXD{1:8}
Digital
Adaptive
Equalizer
RD± {1:8}
ADC
8
Auto-Negotiation
/Link Integrity
CRS/Link
INTR/SLED_DO
LED1{1:8}
LED2{1:8}
Detection
LED/INT
8
8
Drivers
REF_CLK
Clock
Clock
Recovery
Generator
SSSMII_DIS/SLED_CLK
MODES/CONTROLS
Bias
13
RDAC
JTAG
Generator
MII
MDC
MII
Registers
Mgmt
Control
JTAG
Test Logic
MDIO
5
Figure 1: Functional Block Diagram
5228-DS09-405-R
7/12/04
16215 Alton Parkway • P.O. Box 57013 • Irvine, CA 92619-7013 • Phone: 949-450-8700 • Fax: 949-450-8710
BCM5228
Data Sheet
7/12/04
REVISION HISTORY
Revision
Date
Change Description
5228-DS09-405-R
5228-DS08-R
07/12/04
06/02/03
Resized the “BGA Pinout (Top View)” figure to improve readability.
• Added 2.5V I/O-OVDD option under “Features” on the cover.
• Added ”HP Auto-MDIX.”
• Added SLED_CLK frequency to ”Serial LED Mode.”
• Added description to bit 4, Activity LED, in Table 37, ”Auxiliary Mode Register
(Address 29d, 1Dh).”
5228-DS07-R
5228-DS06-R
09/09/02
03/07/02
• Added PLL VDD pin definition table and figures.
• Included details on Isolate mode, super Isolate mode, and Auto Power-Down
mode.
• Included bit 15 (FDX LED enable) changes to serial LED mode.
• Included Jumbo Packet mode bits and descriptions.
• Show correct default value for shadow register 1Ah.
Updated the following:
• “MII Register Map Summary” table.
• “Clock and Reset Timing” figure.
• “Packaging Thermal Characteristics” section.
• “Ordering Information” section.
5228-DS05-R
5228-DS04-R
10/24/01
03/15/01
• Added ordering information; added minor table information updates.
• Added the following to “Features” on the cover:
-
-
-
-
Option-source synchronous SMII (S3MII)
HP Auto-MDIX
Cable Length Indication
Cable Noise Level Indication
• Following Table 32, deleted from Interrupt Enable description: “Bits 14 and 15
of this register are mutually exclusive. Only one may be set at a time.”
• In Table 49, inserted TYP values for parameters TD± after TXEN Assert and
TXD to TD± Steady State Delay.
• In Table 50, added TYP values for parameter CRS_DV Assert after RD±,
CRS_DV Deassert after RD±; and CRS_DV Deassert after RD±, Valid EOP.
Deleted last row (parameter RD± to CRS_DV Steady State Delay).
• In Table 57, added TYP and MAX values for Total Supply Current for AVDD,
DVDD and OVDD pins.
• Added Section 10: “Packaging Thermal Characteristics.”
• Corrected specification of register 19h, bit 0 from jabber detect to full-duplex
indication.
Broadcom Corporation
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Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Revision
Date
Change Description
5228-DS03-R
09/01/00
• Correct several signal name inconsistencies.
• Changed P14 from PLLVDDP to OVDD in:
-
-
Tables 2 and 3
Figures 1, 2, and 3
• Changed AGND from C05 to C06 in Table 3.
• Modified description for “100BASE-FX Mode”.
• Changed LED_CLK to SLED_CLK for “Low-Cost Serial LED Mode.”
• Changed address 1Ah bit 15 in Table 15 from FDX LED Enable to Reserved.
• Deleted FDX LED Enable bit description for Table 32.
• Added TX_ER parameter to Table 49.
• Added CRS_DV, RX_ER, and note 3 to Table 50.
• Changed SRD_Delay to SRX_Delay in Figure 8.
• Deleted reference to IVDD in Table 57.
5228-DS02-R
5228-DS01-R
12/15/99
11/24/99
Added MDIX info. Minor editorial changes.
Initial release.
Broadcom Corporation
Document 5228-DS09-405-R
Page iii
Broadcom Corporation
P.O. Box 57013
16215 Alton Parkway
Irvine, CA 92619-7013
© 2004 by Broadcom Corporation
All rights reserved
Printed in the U.S.A.
Broadcom® and the pulse logo are registered trademarks of Broadcom Corporation and/or its subsidiaries in the United
States and certain other countries. All other trademarks mentioned are the property of their respective owners.
This data sheet (including, without limitation, the Broadcom component(s) identified herein) is not designed, intended,
or certified for use in any military, nuclear, medical, mass transportation, aviation, navigations, pollution control,
hazardous substances management, or other high risk application. BROADCOM PROVIDES THIS DATA SHEET "AS-
IS", WITHOUT WARRANTY OF ANY KIND. BROADCOM DISCLAIMS ALL WARRANTIES, EXPRESSED AND
IMPLIED, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
Data Sheet
BCM5228
7/12/04
TABLE OF CONTENTS
Section 1: Functional Description......................................................................................1
Overview ....................................................................................................................................................... 1
Encoder/Decoder ......................................................................................................................................... 1
Link Monitor.................................................................................................................................................. 2
Carrier Sense................................................................................................................................................ 2
Auto-Negotiation .......................................................................................................................................... 3
Digital Adaptive Equalizer .......................................................................................................................... 3
ADC ............................................................................................................................................................... 3
Digital Clock Recovery/Generator .............................................................................................................. 3
Baseline Wander Correction....................................................................................................................... 3
Multimode Transmit DAC ............................................................................................................................ 5
Stream Cipher............................................................................................................................................... 5
Far-End Fault ................................................................................................................................................ 5
Reduced Media Independent Interface (RMII)............................................................................................ 5
MII Management ........................................................................................................................................... 6
Serial Media Independent Interface (SMII) ................................................................................................. 6
Interrupt Mode.............................................................................................................................................. 7
Section 2: Hardware Signal Definition Table.....................................................................9
Section 3: Pinout Diagrams ..............................................................................................19
Section 4: Operational Description..................................................................................25
Resetting the BCM5228 ............................................................................................................................. 25
Loopback Mode.......................................................................................................................................... 25
Full-Duplex Mode ....................................................................................................................................... 25
100BASE-FX Mode ..................................................................................................................................... 25
10BASE-T Mode ......................................................................................................................................... 26
Isolate Mode ............................................................................................................................................... 26
Super Isolate Mode .................................................................................................................................... 26
Auto Power-Down Mode............................................................................................................................ 26
Jumbo Packet Mode .................................................................................................................................. 27
PHY Address .............................................................................................................................................. 27
HP Auto-MDIX............................................................................................................................................. 28
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Section 5: LED Modes....................................................................................................... 29
Description..................................................................................................................................................29
Serial LED Mode .........................................................................................................................................29
Low-Cost Serial LED Mode........................................................................................................................30
Parallel LED Mode ......................................................................................................................................33
Section 6: Register Summary .......................................................................................... 35
MII Management Interface: Register Programming.................................................................................35
MII Register Map Summary...................................................................................................................37
MII Status Register .....................................................................................................................................41
PHY Identifier Registers.............................................................................................................................42
Auto-Negotiation Advertisement Register ...............................................................................................43
Auto-Negotiation Link Partner (LP) Ability Register ...............................................................................44
Auto-Negotiation Expansion Register......................................................................................................45
Auto-Negotiation Next Page Register.......................................................................................................46
Auto-Negotiation Link Partner (LP) Next Page Transmit Register.........................................................47
100BASE-X Auxiliary Control Register.....................................................................................................48
100BASE-X Auxiliary Status Register.......................................................................................................49
100BASE-X Receive Error Counter...........................................................................................................50
100BASE-X False Carrier Sense Counter.................................................................................................51
100BASE-X Disconnect Counter...............................................................................................................51
Auxiliary Control/Status Register .............................................................................................................52
Auxiliary Status Summary Register..........................................................................................................54
Interrupt Register........................................................................................................................................55
Auxiliary Mode 2 Register..........................................................................................................................56
10BASE-T Auxiliary Error and General Status Register .........................................................................57
Auxiliary Mode Register.............................................................................................................................60
Auxiliary Multiple PHY Register ................................................................................................................61
Broadcom Test Register ............................................................................................................................62
Auxiliary Mode 4 (PHY 1) Register (Shadow Register) ...........................................................................63
Auxiliary Mode 4 (PHY 2) Register (Shadow Register) ...........................................................................64
Auxiliary Mode 4 (PHY 3) Register (Shadow Register) ...........................................................................65
Auxiliary Status 2 Register (Shadow Register)........................................................................................66
Auxiliary Status 3 Register (Shadow Register)........................................................................................67
Auxiliary Mode 3 Register (Shadow Register) .........................................................................................68
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BCM5228
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Auxiliary Status 4 Register (Shadow Register) ....................................................................................... 69
Section 7: Timing and AC Characteristics ......................................................................70
Section 8: Electrical Characteristics................................................................................76
Section 9: Mechanical Information...................................................................................78
Section 10: Packaging Thermal Characteristics.............................................................80
Section 11: Application Examples ...................................................................................82
Section 12: Ordering Information.....................................................................................87
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Data Sheet
7/12/04
Broadcom Corporation
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Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
LIST OF FIGURES
Figure 1: Functional Block Diagram .....................................................................................................................i
Figure 2: BCM5228F Pinout Diagram .............................................................................................................. 19
Figure 3: BCM5228U Pinout Diagram.............................................................................................................. 20
Figure 4: BGA Pinout (Top View) ..................................................................................................................... 21
Figure 5: Clock and Reset Timing .................................................................................................................... 70
Figure 6: RMII Transmit Packet Timing............................................................................................................ 71
Figure 7: RMII Receive Packet Timing............................................................................................................. 72
Figure 8: RMII Receive Packet with False Carrier............................................................................................ 72
Figure 9: SMII/S3MII Timing............................................................................................................................. 73
Figure 10: Management Interface Timing......................................................................................................... 74
Figure 11: Management Interface Timing (with Preamble Suppression On).................................................... 74
Figure 12: 208-Pin PQFP Package .................................................................................................................. 78
Figure 13: 256-Pin Fine Pitch BGA (FPBGA) Package.................................................................................... 79
Figure 14: SMII Application .............................................................................................................................. 82
Figure 15: SMII Application using Source Synchronous Signals...................................................................... 83
Figure 16: Switch Application ........................................................................................................................... 85
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BCM5228
Data Sheet
7/12/04
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Data Sheet
BCM5228
7/12/04
LIST OF TABLES
Table 1: 4B5B Encoding..................................................................................................................................... 4
Table 2: Pin Definitions....................................................................................................................................... 9
Table 3: BGA Ballout by Signal Name.............................................................................................................. 22
Table 4: Receive FIFO Size Select .................................................................................................................. 27
Table 5: Jumbo Packet Enable and Descrambler Lock Timer ......................................................................... 27
Table 6: Serial LED Mode Bit Framing............................................................................................................. 29
Table 7: Low-Cost Serial Mode Bank 1 LED Selection .................................................................................... 30
Table 8: Low-Cost Serial Mode Bank 2 LED Selection .................................................................................... 30
Table 9: Low-Cost Serial Mode Bank 3 LED Selection .................................................................................... 31
Table 10: Low-Cost Serial Mode Bank 4 LED Selection .................................................................................. 31
Table 11: Low-Cost Serial Mode Bank 5 LED Selection .................................................................................. 31
Table 12: Low-Cost Serial Mode Bank 6 LED Selection .................................................................................. 32
Table 13: Parallel LED Mode LED1 Selection.................................................................................................. 33
Table 14: Parallel LED Mode LED2 Selection.................................................................................................. 33
Table 15: Parallel LED Mode LED3 Selection.................................................................................................. 34
Table 16: MII Management Frame Format....................................................................................................... 35
Table 17: MII Register Map Summary.............................................................................................................. 37
Table 18: MII Shadow Register Map Summary (MII Register 1Fh, bit7 = 1).................................................... 38
Table 19: MII Control Register (Address 00d, 00h).......................................................................................... 39
Table 20: MII Status Register (Address 01d, 01h) ........................................................................................... 41
Table 21: PHY Identifier Registers (Addresses 02d and 03d, 02h and 03h).................................................... 42
Table 22: Auto-Negotiation Advertisement Register (Address 04d, 04h)......................................................... 43
Table 23: Auto-Negotiation Link Partner Ability Register (Address 05d, 05h).................................................. 44
Table 24: Auto-Negotiation Expansion Register (Address 06d, 06h)............................................................... 45
Table 25: Next Page Transmit Register (Address 07d, 07h)............................................................................ 46
Table 26: Next Page Transmit Register (Address 08d, 08h)............................................................................ 47
Table 27: 100-BASE-X Auxiliary Control Register (Address 16d, 10h)............................................................ 48
Table 28: 100BASE-X Auxiliary Status Register (Address 17d, 11h)............................................................... 49
Table 29: 100BASE-X Receive Error Counter (Address 18d, 12h).................................................................. 50
Table 30: 100BASE-X False Carrier Sense Counter (Address 19d, 13h)........................................................ 51
Table 31: 100BASE-X Disconnect Counter...................................................................................................... 51
Table 32: Auxiliary Control/Status Register (Address 24d, 18h) ...................................................................... 52
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Data Sheet
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Table 33: Auxiliary Status Summary Register (Address 25d, 19h)...................................................................54
Table 34: Interrupt Register (Address 26d, 1Ah) ..............................................................................................55
Table 35: Auxiliary Mode 2 Register (Address 27d, 1Bh) .................................................................................56
Table 36: 10BASE-T Auxiliary Error and General Status Register (Address 28d, 1Ch)...................................57
Table 37: Auxiliary Mode Register (Address 29d, 1Dh)....................................................................................60
Table 38: Auxiliary Multiple PHY Register (Address 30d, 1Eh) ........................................................................61
Table 39: Broadcom Test (Address 31d, 1Fh)..................................................................................................62
Table 40: Auxiliary Mode 4 (PHY 1) Register (Shadow Register 26d, 1Ah) .....................................................63
Table 41: Auxiliary Mode 4 (PHY 2) Register (Shadow Register 26d, 1Ah) .....................................................64
Table 42: Auxiliary Mode 4 (PHY 3) Register (Shadow Register 26d, 1Ah) .....................................................65
Table 43: Auxiliary Status 2 Register (Shadow Register 27d, 1Bh)..................................................................66
Table 44: Cable Length.....................................................................................................................................66
Table 45: Auxiliary Status 3 Register (Shadow Register 28d, 1Ch)..................................................................67
Table 46: Auxiliary Mode 3 Register (Shadow Register 29d, 1Dh)...................................................................68
Table 47: Current Receive FIFO Size...............................................................................................................68
Table 48: Auxiliary Status 4 Register (Shadow Register 30d, 1Eh)..................................................................69
Table 49: Clock Timing .....................................................................................................................................70
Table 50: Reset Timing.....................................................................................................................................70
Table 51: RMII Transmit Timing........................................................................................................................71
Table 52: RMII Receive Timing.........................................................................................................................71
Table 53: SMII/S3MII Timing ............................................................................................................................72
Table 54: Auto-Negotiation Timing ...................................................................................................................73
Table 55: LED Timing .......................................................................................................................................73
Table 56: MII Management Data Interface Timing............................................................................................73
Table 58: Recommended Operating Conditions...............................................................................................76
Table 59: Electrical Characteristics...................................................................................................................76
Table 60: ThetaJA vs. Airflow for the BCM5228B (256 FPBGA) Package........................................................80
Table 61: ThetaJA vs. Airflow for the BCM5228F (208 PQFP) Package...........................................................80
Table 62: ThetaJA vs. Airflow for the BCM5228U (208 PQFP) Package ..........................................................80
Table 63: ThetaJA vs. Airflow for the BCM5228B with Heat Sink......................................................................87
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Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Section 1: Functional Description
OVERVIEW
The BCM5228 is a single-chip device containing eight independent Fast Ethernet transceivers. Each transceiver performs
all of the physical layer interface functions for 100BASE-TX full-duplex or half-duplex Ethernet on Category 5 unshielded
twisted-pair (UTP) cable, and 10BASE-T full-duplex or half-duplex Ethernet on Category 3, 4, or 5 UTP cable. Each port can
also be configured for 100BASE-FX full-duplex or half-duplex transmission over fiber-optic cabling when paired with an
external fiber-optic line driver and receiver.
The chip performs:
•
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4B5B, MLT3, NRZI, and Manchester encoding and decoding
Clock and data recovery
Stream cipher scrambling/descrambling
Digital adaptive equalization
Line transmission
Carrier sense and link integrity monitor
Auto-negotiation
RMII, SMII, S3MII, and management functions
The BCM5228 can be connected to a MAC through the RMII or SMII on one side, and directly to the network media on the
other side through either:
•
•
Isolation transformers for UTP modes
Fiber-optic transmitter/receiver components for FX mode
The BCM5228 is compliant with the IEEE 802.3 standard.
ENCODER/DECODER
In 100BASE-TX and 100BASE-FX modes, the BCM5228 transmits and receives a continuous data stream on twisted-pair
or fiber-optic cable. When the RMII Transmit Enable pin is asserted, data from the transmit data pins is encoded into 5-bit
code groups and inserted into the transmit data stream. The 4B5B encoding is shown in Table 1 on page 4. The transmit
packet is encapsulated by replacing the first two nibbles of preamble with a start-of-stream delimiter (J/K codes) and
appending an end-of-stream delimiter (T/R codes) to the end of the packet. The transmitter repeatedly sends the idle code
group between packets.
In TX mode, the encoded data stream is scrambled by a stream cipher block and then serialized and encoded into MLT3
signal levels. A multimode transmit DAC is used to drive the MLT3 data onto the twisted-pair cable. In FX mode, the
scrambling function is bypassed and the data is NRZI encoded. The multimode transmit DAC drives differential positive ECL
(PECL) levels to an external fiber-optic transmitter.
Broadcom Corporation
Document 5228-DS09-405-R
Functional Description
Page 1
BCM5228
Data Sheet
7/12/04
Following baseline wander correction, adaptive equalization, and clock recovery in TX mode, the receive data stream is
converted from MLT3 to serial NRZI data. The NRZI data is descrambled by the stream cipher block and then deserialized
and aligned into 5-bit code groups.
In FX mode, the receive data stream differential PECL levels are sampled from the fiber-optic receiver. Baseline wander
correction, adaptive equalization, and stream cipher descrambling functions are bypassed, and NRZI decoding is used
instead of MLT3.
The 5-bit code groups are decoded into 4-bit data nibbles, as shown in Table 1 on page 4. The start-of-stream delimiter is
replaced with preamble nibbles, and the end-of-stream delimiter and idle codes are replaced with all zeros. The decoded
data is driven onto the RMII/SMII receive data pins. When an invalid code group is detected in the data stream, the BCM5228
asserts the RMII/SMII RXER signal. The chip also asserts RXER for several other error conditions that improperly terminate
the data stream. While RXER is asserted, the receive data pins are driven with a 01 for an invalid data reception and a 10
for a false carrier.
In 10BASE-T mode, Manchester encoding and decoding is performed on the data stream. The multimode transmit DAC
performs pre-equalization for 100m of Category 3 cable.
LINK MONITOR
In 100BASE-TX mode, receive signal energy is detected by monitoring the receive pair for transitions in the signal level.
Signal levels are qualified using squelch detect circuits. When no signal or certain invalid signals are detected on the receive
pair, the link monitor enters and remains in the Link Fail state where only idle codes are transmitted. When a valid signal is
detected on the receive pair for a minimum period of time, the link monitor enters the Link Pass state and the transmit and
receive functions are enabled.
In 100BASE-FX mode, the external fiber-optic receiver performs the signal energy detection function and communicates this
information directly to the BCM5228 through the differential SD± pins.
In 10BASE-T mode, a link-pulse detection circuit constantly monitors the RD± pins for the presence of valid link pulses.
CARRIER SENSE
In DTE mode, the carrier sense and receive data valid signals are multiplexed on the same pin. The carrier sense is asserted
asynchronously on the CRS_DV pin as soon as valid activity is detected in the receive data stream. Loss of carrier results
in the deassertion of CRS_DV synchronous to the cycle of REF_CLK that presents the first di-bit of a nibble onto RXD. If the
PHY has additional bits to be presented on RXD following the initial deassertion of CRS_DV, the PHY asserts CRS_DV on
cycles of REF_CLK that present the second di-bit of each nibble, and deasserts CRS_DV on cycles of REF_CLK that
present the first di-bit of each nibble. If carrier sense is asserted and a valid SSD is not detected immediately, RXER is
asserted. A value of 2h (2 hex) is driven on the receive data pins to indicate false carrier sense.
In 10BASE-T mode, carrier sense is asserted asynchronously on the CRS pin when valid preamble activity is detected on
the RD± input pins.
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Link Monitor
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
AUTO-NEGOTIATION
The BCM5228 contains the ability to negotiate its mode of operation over the twisted-pair link using the auto-negotiation
mechanism defined in the IEEE 802.3u specification. Auto-negotiation can be enabled or disabled by hardware or software
control. When the auto-negotiation function is enabled, the BCM5228 automatically chooses its mode of operation by
advertising its abilities and comparing them with those received from its link partner. The BCM5228 can be configured to
advertise 100BASE-TX full-duplex and/or half-duplex and 10BASE-T full-duplex and/or half-duplex. Each transceiver
negotiates independently with its link partner and chooses the highest level of operation available for its own link.
DIGITAL ADAPTIVE EQUALIZER
The digital adaptive equalizer removes interzonal interference created by the transmission channel media. The equalizer
accepts sampled unequalized data from the ADC on each channel and produces equalized data. The BCM5228 achieves
an optimum signal to noise ratio by using a combination of feed-forward equalization and decision-feedback equalization.
This powerful technique achieves a 100BASE-TX BER of less than 1 x 10-12 for transmission up to 100 meters on Category 5
twisted-pair cable, even in harsh noise environments. The digital adaptive equalizers in the BCM5228 achieve performance
close to theoretical limits. The all-digital nature of the design makes the performance very tolerant to on-chip noise. The filter
coefficients are self adapting to any quality of cable or cable length. Because of transmit pre-equalization in 10BASE-T mode
and complete lack of ISI in 100BASE-FX mode, the adaptive equalizer is bypassed in this mode of operation.
ADC
Each receive channel has its own 125-MHz analog to digital converter (ADC). The ADC samples the incoming data on the
receive channel and produces a digital output. The output of the ADC is fed to the digital adaptive equalizer. Advanced
analog circuit techniques achieve low offset, high power supply noise rejection, fast settling time, and low bit error rate (BER).
DIGITAL CLOCK RECOVERY/GENERATOR
The all-digital clock recovery and generator block creates all internal transmit and receive clocks. The transmit clocks are
locked to the 50-MHz clock input, while the receive clocks are locked to the incoming data streams. Clock recovery circuits
optimized to MLT3, NRZI, and Manchester encoding schemes are included for use with each of the three different operating
modes. The input data streams are sampled by the recovered clock from each port and fed synchronously to the respective
digital adaptive equalizer.
BASELINE WANDER CORRECTION
A 100BASE-TX data stream is not always DC balanced. Because the receive signal must pass through a transformer, the
DC offset of the differential receive input can wander. This effect, known as baseline wander, can greatly reduce the noise
immunity of the receiver. The BCM5228 automatically compensates for baseline wander by removing the DC offset from the
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Auto-Negotiation
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BCM5228
Data Sheet
7/12/04
input signal, and thereby significantly reducing the chance of a receive symbol error. The baseline wander correction circuit
is not required, and is therefore bypassed, in 10BASE-T and 100BASE-FX operating modes
Table 1: 4B5B Encoding
Name
4b Code
5b Code
Meaning
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
I
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
11110
01001
10100
10101
01010
01011
01110
01111
10010
10011
10110
10111
11010
11011
11100
11101
11111
Data 0
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Data 9
Data A
Data B
Data C
Data D
Data E
Data F
Idle
0000a
0101a
0101a
0000a
J
11000
10001
01101
00111
Start-of-stream delimiter, part 1
Start-of-stream delimiter, part 2
End-of-stream delimiter, part 1
End-of-stream delimiter, part 2
K
T
R
0000a
1000
0111
0111
0111
0111
0111
0111
0111
0111
0111
0111
H
V
V
V
V
V
V
V
V
V
V
00100
00000
00001
00010
00011
00101
00110
01000
01100
10000
11001
Transmit error (used to force signalling errors)
Invalid code
Invalid code
Invalid code
Invalid code
Invalid code
Invalid code
Invalid code
Invalid Code
Invalid Code
Invalid Code
a. Treated as invalid code (mapped to 0111) when received in data field.
Broadcom Corporation
Page 4
Baseline Wander Correction
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
MULTIMODE TRANSMIT DAC
The multimode transmit digital to analog converter (DAC) transmits MLT3-coded symbols in 100BASE-TX mode, NRZI-
coded symbols in 100BASE-FX mode and Manchester-coded symbols in 10BASE-T mode. It performs programmable edge-
rate control in TX mode, which decreases unwanted high frequency signal components thus reducing EMI. High-frequency
pre-emphasis is performed in 10BASE-T mode, and no filtering is performed in 100BASE-FX mode. The transmit DAC
utilizes a current drive output which is well balanced and produces very low noise transmit signals. PECL voltage levels are
produced with resistive terminations in 100BASE-FX mode.
STREAM CIPHER
In 100BASE-TX mode, the transmit data stream is scrambled in order to reduce radiated emissions on the twisted-pair cable.
The data is scrambled by exclusive ORing the NRZI signal with the output of an 11-bit wide linear feedback shift register
(LFSR), which produces a 2047-bit non-repeating sequence. The scrambler reduces peak emissions by randomly spreading
the signal energy over the transmit frequency range, and eliminating peaks at certain frequencies. Signal energy is spread
further by using unique seeds to generate a different non-repeating sequence for each of the eight ports.
The receiver descrambles the incoming data stream by exclusive ORing it with the same sequence generated at the
transmitter. The descrambler detects the state of the transmit LFSR by looking for a sequence representing consecutive idle
codes. The descrambler locks to the scrambler state after detecting a sufficient number of consecutive idle code-groups.
The receiver does not attempt to decode the data stream unless the descrambler is locked. Once locked, the descrambler
continuously monitors the data stream to make sure that it has not lost synchronization. The receive data stream is expected
to contain inter-packet idle periods. If the descrambler does not detect enough idle codes within 724 µs, it becomes unlocked,
and the receive decoder is disabled. If the receiver is put into Token Ring mode (see bit 10, register 1Bh), the descrambler
monitors the receiver for 5792 µs before unlocking. The descrambler is always forced into the unlocked state when a link
failure condition is detected. Stream cipher scrambling/descrambling is not used in 100BASE-FX and 10BASE-T modes.
FAR-END FAULT
Auto-negotiation provides a Remote Fault capability for detection of asymmetric link failures. Because auto-negotiation is
not available for 100BASE-FX, the BCM5228 implements the IEEE 802.3 standard Far-End Fault mechanism for the
indication and detection of remote error conditions. If the Far-End Fault mechanism is enabled, a transceiver transmits the
Far-End Fault indication whenever a receive channel failure is detected (signal detect is deasserted). Each transceiver also
continuously monitors the receive channel when a valid signal is present (signal detect asserted). When its link partner is
indicating a remote error, the transceiver forces its link monitor into the link fail state and set the Remote Fault bit in the RMII
status register. The Far-End Fault mechanism is on by default in 100BASE-FX mode, off by default in 100BASE-TX and
10BASE-T modes, and can be controlled by software after reset.
REDUCED MEDIA INDEPENDENT INTERFACE (RMII)
The interface in the BCM5228 is based on the low pin count (Reduced) Media Independent Interface (RMII) developed by
the RMII Consortium. A copy of the specification can be found on the consortium Web site at:
Broadcom Corporation
Document 5228-DS09-405-R
Multimode Transmit DAC
Page 5
BCM5228
Data Sheet
7/12/04
http://www.rmii-consort.com. The purpose of this interface is to provide a low-cost alternative to the IEEE 802.3u[2] Media
Independent Interface (MII). The RMII is capable of supporting 10 megabit and 100 megabit data rates with a single clock,
using independent 2-bit wide transmit and receive paths.
A single 50-MHz synchronous reference clock is used as a timing reference for all transmitters and receivers. By doubling
the clock frequency relative to the MII, four pins are saved in the data path, which uses two lines into each transmitter and
two lines out of each receiver, compared to four lines used in each direction in the MII. Since start-of-packet and end-of-
packet timing information is preserved across the interface, the MAC is able to derive the COL signal from the receive and
transmit data delimiters, saving another pin.
Transmit and receive clocks have been eliminated as well. All data transfers are synchronous with REF_CLK. This poses
less of a challenge for the transmitter than it does for the receiver, which is now required to buffer output data in a FIFO until
an edge of the REF_CLK is suitably aligned. The received data bits and the RX_DV signal are passed through the FIFO,
but the CRS_DV bit is not. It is asserted for the time the wire is receiving a frame. If the remote transmitter is idle, and no
data need be passed from the receiver, status information can be made available by setting Bit 1 of register 10h. Out-of-
band signaling consists of 2 di-bit pairs immediately following the last di-bit pair of a received packet. The 2 di-bit pairs consist
of full-duplex, Link Speed - msb, lsb and RXER, FIFO Error - msb, lsb.
MII MANAGEMENT
Management of each transceiver within the BCM5228 remains the same as it was under the MII specification. Each PHY
contains an independent set of MII management registers. They share a single MDC/MDIO serial interface. Each transceiver
has a unique address and must be accessed individually. The common base address for the group of eight individual
transceivers is defined by configuring the five external PHYAD address input pins.
SERIAL MEDIA INDEPENDENT INTERFACE (SMII)
The SMII is an alternative to both the MII and RMII. The objective is to reduce the number of pins required to interconnect
the MAC and the PHY. This is accomplished by clocking data and control signals in and out of each PHY on a pair of pins
at a rate of 125 MHz. The SMII mode is selected by pulling the SMII_EN pin high during power-on reset.
Data and control signals passing from the MAC to the PHY use the serial transmit (STX) line. Data and control signals
passing from the PHY to the MAC use the serial receive (SRX) line. All bit transfers are synchronous with clock (SCLK) at
125 MHz. Frame synchronization is provided by a fourth line (SYNC), asserted at the beginning of each frame, which occurs
every 10 cycles of SCLK. Each PHY is provided with an STX and an SRX pair. Pins TXD0{x} and RXD0{x}, where x is the
number of the specific PHY, are used to perform the STX and SRX functions.
The BCM5228 chip has a single SCLK and SYNC input that is common to all PHYs. Pins REF_CLK and SSYNC are used
for these functions.
Receive data and control information are passed from the PHY to the MAC in 10 bit frames. In 100 Mbps mode, each frame
represents a new byte of data. In 10 Mbps mode, each byte of data is repeated 10 times. The MAC can sample any one of
every 10 frames. Since the timing of data coming from a remote transmitter is not synchronized with the local SCLK or SYNC
lines and can contain errors in frequency, a FIFO capable of storing 28 bits is provided in each receive path. The received
data bits and the RX_DV signal are passed through the FIFO, but the CRS bit is not. It is asserted for the time the wire is
receiving a frame. If the remote transmitter is idle and no data need be passed from the receiver, status information becomes
available.
Broadcom Corporation
Page 6
MII Management
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Transmit data and control information are passed from the MAC to the PHY in 10 bit frames, as in the receive path. In
100 Mbps mode, each frame represents a new byte of data. In 10 Mbps mode, each byte of data is repeated 10 times, and
the PHY can transmit any one of every 10 frames.
INTERRUPT MODE
The BCM5228 can be programmed to provide an interrupt output consisting of an OR of the eight interrupts, one from each
PHY. The interrupt feature is disabled by default. The interrupt capability is enabled by setting MII register 1Ah, bit 14. The
SLED_DO pin becomes the INTR# pin, when the SERIAL_EN is pulled low during power-up reset. If a serial LED mode is
required, hardware interrupt can be obtained by wire ORing LED2{1:8} open drain outputs and programming LED2 to output
interrupt by setting TXER/LED1{5:3} pins to a 5 during power-on reset. The status of each interrupt source is also reflected
in register 1Ah, bits 1, 2 and 3. The sources of interrupt are change in link, speed or full-duplex status. If any type of interrupt
occurs, the Interrupt Status bit, register 1Ah, bit 0 is set.
In addition, each transceiver has its own register controlling the interrupt function.
If the interrupt enable bit is set to 0, no status bits sets, and no interrupts are generated. If the interrupt enable bit is set to
1, the following conditions apply:
•
•
•
If mask status bits are to 0 and the interrupt mask is set to 1, status bits are set but no interrupts are generated.
If mask status bits are set to 0 and the interrupt mask is set to 0, status bits and interrupts are available.
If mask status bits are set to 1 and the interrupt mask is set to 0, no status bits and no interrupts are available.
Changes from active to inactive or vice versa causes an interrupt. Setting register 1Ah, bit 8 high masks all interrupts,
regardless of the settings of the individual mask bits.
Broadcom Corporation
Document 5228-DS09-405-R
Interrupt Mode
Page 7
BCM5228
Data Sheet
7/12/04
Broadcom Corporation
Page 8
Interrupt Mode
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Section 2: Hardware Signal Definition Table
These conventions are used in the following table:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
# = Active low
I = Digital input
O = Digital output
I/O = Bidirectional
IA = Analog input
OA = Analog output
IPU = Digital input with internal pull-up
IPD = Digital input with internal pull-down
OOD = Open-drain output
O3S = Tri-state output
I/OPD = Bidirectional with internal pull-down
B = Bias
Bus naming convention: Pin label followed by {Port #}
Pin type
Table 2: Pin Definitions
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
Media Connections
A12,B12
A11,B11
A08,B08
A07,B07
T06,R06
T07,R07
T10,R10
T11,R11
A13,B13
A10,B10
A09,B09
A06,B06
T05,R05
T08,R08
T09,R09
T12,R12
166,167
178,177
184,185
196,195
64,65
165,166
173,172
179,180
198,197
62,63
RD+{1}, RD–{1}
IA
Receive Pair. Differential data from the media
is received on the RD signal pair.
RD+{2}, RD–{2}
RD+{3}, RD–{3}
RD+{4}, RD–{4}
RD+{5}, RD–{5}
RD+{6}, RD–{6}
RD+{7}, RD–{7}
RD+{8}, RD–{8}
TD+{1}, TD–{1}
TD+{2}, TD–{2}
TD+{3}, TD–{3}
TD+{4}, TD–{4}
TD+{5}, TD–{5}
TD+{6}, TD–{6}
TD+{7}, TD–{7}
TD+{8}, TD–{8}
76,75
81,80
82,83
87,88
94,93
95,94
164,165
180,179
182,183
198,197
62,63
163,164
175,174
177,178
200,199
60,61
OA
Transmit Pair. Differential data is transmitted
to the media on the TD signal pair.
78,77
83,82
80,81
85,86
96,95
97,96
Broadcom Corporation
Document 5228-DS09-405-R
Hardware Signal Definition Table
Page 9
BCM5228
Data Sheet
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
D12,E12
D11,E11
D08,E08
E07,D07
N09,M09
N10,M10
N11,M11
N12,M12
171,170
173,174
189,188
191,192
69,68
SD+{1}, SD–{1}
SD+{2}, SD–{2}
SD+{3}, SD–{3}
SD+{4}, SD–{4}
SD+{5}, SD–{5}
SD+{6}, SD–{6}
SD+{7}, SD–{7}
SD+{8}, SD–{8}
IPD
100BASE-FX Signal Detect. Indicates signal
quality status on the fiber-optic link in
100BASE-FX mode. When the signal quality
is good, the SD+ pin should be driven high
relative to the SD− pin. 100BASE-FX mode is
disabled when both pins are simultaneously
pulled low or left unconnected.
71,72
87,86
89,90
Reduced Media Independent Interface (RMII)
T15
99
100
REF_CLK
I
Reference Clock Input. This pin must be
driven with a continuous 50-MHz clock in the
RMII application and a 125-MHz clock in the
SMII application. It provides timing for
CRS_DV, RXD1, RXD0, TX_EN,
TXD1,TXD0, and RX_ER. Accuracy shall be
±50 ppm, with a duty cycle between 35% and
65% inclusive.
C03
B02
B01
A01
T01
R01
P04
P03
D16
E16
F15
F16
G15
G16
H15
H16
J15
4
4
TX_EN{1:8}
IPD
Transmit Enable. In RMII mode,active high
indicates that the MAC is presenting di-bits on
TXD1,TXD0 for transmission. TX_EN is
asserted synchronously with the first nibble of
the preamble and remains asserted while all
di-bits to be transmitted are presented to the
RMII. TX_EN transitions synchronously with
respect to REF_CLK.
3
3
208
207
53
208
207
53
52
52
51
51
50
50
149
150
145
146
139
140
135
136
127
128
123
124
117
118
113
114
149
150
145
146
139
140
135
136
127
128
123
124
117
118
113
114
TXD1{1}
TXD0{1}
TXD1{2}
TXD0{2}
TXD1{3}
TXD0{3}
TXD1{4}
TXD0{4}
TXD1{5}
TXD0{5}
TXD1{6}
TXD0{6}
TXD1{7}
TXD0{7}
TXD1{8}
TXD0{8}
IPD
Transmit Data Input. In RMII mode,
TXD1,TXD0 dibit wide data is input on these
pins for transmission by the PHY. The data is
synchronous with REF_CLK. TXD1 is the
most significant bit. Values other than 00 on
TXD1,TXD0 while TX_EN is deasserted are
ignored by the PHY.
In SMII mode, the TXD0{1:8} form the STXD
pins for each PHY.
J16
K15
K16
L15
L16
M15
M16
Broadcom Corporation
Page 10
Hardware Signal Definition Table
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
A02
A03
B04
A04
R03
R02
T03
T02
D14
D15
E14
E15
F12
F13
G12
G14
H12
H13
J12
204
203
202
201
59
206
205
204
203
57
CRS_DV{1:8}
O3S
Carrier Sense/Receive Data Valid. In RMII
mode, CRS_DV shall be asserted by the PHY
when the medium is non-idle. The data on
RXD1,RXD0 is considered valid once
CRS_DV is asserted. During a false carrier
event, CRS_DV shall remain asserted for the
duration of carrier activity. CRS_DV is not
synchronized with respect to REF_CLK.
58
56
57
55
56
54
151
152
147
148
141
142
137
138
129
130
125
126
119
120
115
116
8
151
152
147
148
141
142
137
138
129
130
125
126
119
120
115
116
8
RXD1{1}
RXD0{1}
RXD1{2}
RXD0{2}
RXD1{3}
RXD0{3}
RXD1{4}
RXD0{4}
RXD1{5}
RXD0{5}
RXD1{6}
RXD0{6}
RXD1{7}
RXD0{7}
RXD1{8}
RXD0{8}
RX_ER{1:8}
O3S
Receive Data Outputs. In RMII mode,
RXD1,RXD0 data is output synchronous with
REF_CLK. For each clock period in which
CRS_DV is asserted, RXD1,RXD0 transfers 2
bits of data from the PHY. RXD1 is the most
significant bit.
In SMII mode, the RXD0{1:8} form the SRXD
pins for each PHY.
J14
K12
K13
L12
L14
D02
D01
C02
C01
N03
M01
M02
L01
O3S
Receive Error Detected. In RMII mode,
RX_ER is asserted high for one or more
REF_CLK periods to indicate that an error
was detected somewhere in the frame
presently being transferred from the PHY.
RX_ER transitions synchronously with
respect to REF_CLK.
7
7
6
6
5
5
43
43
42
42
41
41
40
40
Serial Media Independent Interface (SMII)
H01
23
23
SMII_EN/SLED_CLK I/OPU
SMII Enable. Active high. An active high or
being left unconnected during power-on reset
selects the SMII mode, while an active low
selects the RMII mode.
Serial LED Clock. After power-on reset, if
Serial or Low-Cost Serial LED mode is
enabled, this pin sources the clock for serial
data SLED_DO. For details, see “LED
Modes” on page 29.
Broadcom Corporation
Document 5228-DS09-405-R
Hardware Signal Definition Table
Page 11
BCM5228
Data Sheet
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
P15
105
105
SSYNC
IPD
SMII SYNC. In SMII mode, this pin must be
connected to a free running sync pulse
occurring 1 of every 10 clock cycles. In RMII
mode, this pin is NC (No Connect).
Data and controls are transferred through
TXD0 and RXD0 between respective MAC
and PHY in default SMII mode. If source
synchronous enable, SSMII_EN, is high, then
SSYNC provides sync for TXD0 only and
SMII_RSYNC from the BCM5228 provides
sync for RXD0.
R15
103
103
SSMII_EN
IPD
SMII Source Synchronous (S3MII) Enable.
Active high. When S3MII is enabled, the
BCM5228 provides a source synchronous
receive clock (SMII_RXC) and a sync
(SMII_RSYNC) for MAC to use. The
BCM5228 uses SMII_TXC along with SSYNC
to receive data from the MAC. Signals
CRS_DV, TXER, TXEN, and RXER are not
used when Source Synchronous mode is
enabled.
R16
P16
106
107
106
107
SMII_RXC
O3S
O3S
SMII Source Synchronous Receive Clock.
Optional 125-MHz clock in SMII mode for
MAC use to clock in RXD0.
SMII_RSYNC
SMII Source Synchronous SYNC. In S3MII
mode, this pin provides a source
synchronous SYNC pulse for MAC to use
for RXD0 if Source Synchronous is enabled.
T16
104
104
SMII_TXC
IPD
SMII Source Synchronous Transmit Clock.
125-MHz clock in SMII mode for BCM5228 to
clock in TXD0 if Source Synchronous is
enabled.
Management Data I/O
J01
32
31
32
31
MDIO
MDC
I/OPU
Management Data I/O. This serial input/
output bit is used to read from and write to the
RMII registers. The data value on the MDIO
pin is valid and latched on the rising edge of
MDC.
K01
IPD
Management Data Clock. The MDC clock
input must be provided to allow RMII
management functions. Clock frequencies up
to 25 MHz are supported.
G05
H05
H04
J05
J03
24
25
26
27
28
24
25
26
27
28
PHYAD{4:0}
IPD
PHY Address Selects. These inputs set the
base address for MII management PHY
addresses. Also serve as test control inputs
along with TESTEN to select the NAND-chain
test mode.
Broadcom Corporation
Page 12
Hardware Signal Definition Table
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
H02
22
22
MASTERPHY/
SFRAME
I/OPD
Master PHY Address Mode. Active high.
This forces PHY address 0 to be a global write
address for all PHYs within the BCM5228. An
active high during power-on reset selects the
master PHY address mode, while an active
low or being left unconnected selects the
normal address mode.
Serial LED Frame. After power-on reset, this
pin sources the serial LED frame output signal
if serial LED mode is enabled.
Mode
C16
N15
157
109
157
109
RESET#
F100
IPU
IPU
Reset. Active Low. Resets the BCM5228. Pin
not included in NAND chain.
10/100 Mode Select. When high and ANEN is
low, all transceivers are forced to 100BASE-X
operation. When low and ANEN is low, all
transceivers are forced to 10BASE-T
operation. When ANEN is high, F100 has no
effect on the operation.
M13
C15
108
156
108
156
ANEN
IPU
Auto-Negotiation Enable. Active high. When
pulled high, auto-negotiation begins
immediately after reset. When low, auto-
negotiation is disabled after reset. Auto-
negotiation can be enabled under software
control (register 0, bit 12) if auto-negotiation is
enabled through hardware.
FDXEN
IPD
Full-Duplex Mode Enable. The FDXEN pin is
logically ORed with an MII control bit to
generate an internal full-duplex enable signal.
When FDXEN is high, the BCM5228 can
operate in full-duplex mode as determined by
auto-negotiation. When FDXEN is low, the
internal control bit (register 0, bit 8)
determines the full-duplex operating mode.
Initial value of the internal control bit is zero.
G01
F05
19
20
19
20
TXER_EN
MDIX_DIS
I/OPU
I/OPD
TXER Enable. Active high. When pulled high
during power-on reset, TXER[1:8]/LED1[1:8]
pins become TXER[1:8] input. Otherwise they
become LED1[1:8] output.
HP Auto-MDIX Disable. Active high. When
pulled high during reset, automatic TX cable
swap detection function of the BCM5228 is
disabled. Leave this pin unconnected for
normal operation.
F04
17
17
TESTEN
IPD
Test Enable. Active high test control input
used along with PHYAD[4:0] to select the
NAND-chain test mode. This test mode is
latched when TESTEN is pulsed high, then
low, with PHYAD[4:0]=10111. This pin is not
included in the NAND chain and must be
pulled low or left unconnected during normal
operation.
Broadcom Corporation
Document 5228-DS09-405-R
Hardware Signal Definition Table
Page 13
BCM5228
Data Sheet
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
LED
G03
21
21
SERIAL_EN
LC_SER_EN
I/OPD
Serial LED Enable. Active high. Serial LED
mode is enabled if this pin is high and the LC-
SER_EN pin is low during power-on reset.
Serial LED mode and Low-Cost Serial LED
mode cannot be active at the same time.
For details, see “LED Modes” on page 29.
G02
18
18
I/OPU
Low-Cost Serial LED Enable. Active high.
Low-Cost Serial LED mode is enabled if this
pin is high and SER_EN pin is high during
power-on reset. Low-Cost Serial LED mode
and Serial LED mode can not be active at the
same time.
For details, see “LED Modes” on page 29.
K02
30
30
SLED_DO/INTR#
OOD
Serial LED Data. Active low serial LED
data. This pin becomes serial LED data
output if SER_EN pin is high during power-
on reset. For details, see “LED
Modes” on page 29.
PHY Interrupt. Active low output. This pin
becomes interrupt output if SER_EN pin is low
during power-on reset.
F01
F02
E01
E02
P01
P02
N02
N01
12
11
10
9
12
11
10
9
TX_ER{1:8}
LED1{1:8}
I/OPD
TXER[1:8]. Active high input. This pin
becomes TXER input if TXER_EN pin is high
during power-on reset. TXER function is
typically used in HSTR application for
transmitting halt codes.
47
46
45
44
47
46
45
44
TXER[1:8] pins are sampled during power-on
reset to set the default LED output for LED1,
LED2 and LED3. For details, see “LED
Modes” on page 29.
LED1[1:8]. Active low output. This pin
becomes LED1 output if TXER_EN pin is low
during power-on reset. LED1 can be
configured to output one of LINK, SPEED,
ACTIVITY, FULL-DUPLEX, TRANSMIT,
RECEIVE, INTERRUPT or COLLISION
status. For details, see “LED
Modes” on page 29.
C04
E06
D05
C05
M07
N07
M06
N06
185
186
187
188
68
LED2{1:8}
OOD
LED2. Active low. This pin can be configured
to output one of SPEED, ACTIVITY, FULL-
DUPLEX, TRANSMIT, RECEIVE,
INTERRUPT, COLLISION, or LINK status.
For details, see “LED Modes” on page 29.
69
70
71
Broadcom Corporation
Page 14
Hardware Signal Definition Table
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
D03
B03
E05
D04
M05
N04
N05
M04
189
190
191
192
72
LED3{1:8}
O3S
LED3. Active low. The function of this LED
signal can be configured to output one of
ACTIVITY, FULL-DUPLEX, LINK or SPEED
status. For details, see “LED
Modes” on page 29.
73
74
75
Bias
A15
A14
161
162
160
161
RDAC
VREF
B
B
DAC Bias Resistor. Adjusts the current level
of each of the transmit DAC’s. A resistor of
1.24-kΩ 1% must be connected between
the RDAC pin and AGND.
Voltage Reference. Low-impedance bias pin
driven by the internal band-gap voltage
reference. This pin must be left unconnected
during normal operation.
JTAG
L02
L03
37
35
37
35
TDI
IPU
Test Mode Select. Serial data input to the
JTAG TAP controller. Sampled on the rising
edge of TCK. If unused, it can be left
unconnected.
TMS
IPU
Test Data Input. Single control input to the
JTAG TAP controller used to traverse the test-
logic state machine. Sampled on the rising
edge of TCK. If unused, it can be left
unconnected.
L05
K04
36
33
36
33
TCK
TDO
IPU
Test Clock. Clock input used to synchronize
the JTAG TAP control and data transfers. If
unused, it can be left unconnected.
O3S
Test Data Output. Serial data output from the
JTAG TAP Controller. Updated on the falling
edge of TCK. Actively driven both high and
low when enabled, otherwise high
impedance.
K05
34
34
TRST#
IPU
Test Reset. Asynchronous active-low reset
input to the JTAG TAP Controller. Must be
held low during power-up to insure the TAP
Controller initializes to the test-logic-reset
state. Can be pulled low continuously when
JTAG functions are not used. Must be held
low for normal operation.
Power
T14
101
102
PLLVDDC
2.5-V, Phase Locked Loop VDD Core,
DVDD
R14
P14
98
99
PLLGND
Phase Locked Loop GND
100
101
PLLVDDP
PLL PAD VDD. Tie this to the same supply as
OVDD.
A16
160
159
BIASVDD
2.5-V, Bias VDD
Broadcom Corporation
Document 5228-DS09-405-R
Hardware Signal Definition Table
Page 15
BCM5228
Data Sheet
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label
I/O
Description
B16
A05
C07
C10
C13
P07
P11
T04
T13
B05
B14
B15
C06
C08
C09
C11
C12
D09
D10
E09
P05
P06
P08
P09
P10
P12
P13
R04
R13
E04
E13
G04
K14
L04
N13
C14
F03
G06
J13
163
67
162
65
BIASGND
AVDD
Bias GND
2.5-V, Analog VDD
73
78
85
90
91
92
169
175
187
193
61
168
170
182
195
59
AGND
Analog GND
66
64
70
66
74
77
79
79
84
84
88
89
92
91
97
93
168
172
176
181
186
190
194
199
98
167
169
171
176
181
183
194
196
201
2
2
DVDD
DGND
2.5-V, Digital Core VDD
15
15
48
48
111
132
154
1
111
132
154
1
Digital Core GND
14
14
49
49
110
133
155
110
133
155
M03
N14
Broadcom Corporation
Page 16
Hardware Signal Definition Table
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Table 2: Pin Definitions (Cont.)
BCM5228B BCM5228F BCM5228U Pin Label I/O
Description
3.3V, Digital Periphery (Output Buffer) VDD
D06
E03
F14
G13
H03
K03
L13
M14
N08
D13
F06
F07
H11
H14
J04
13
13
OVDD
16
16
39
39
121
122
143
144
67
121
122
143
144
184
38
38
OGND
Digital Periphery (Output Buffer) GND
60
58
112
131
134
153
200
76
112
131
134
153
193
202
L06
L07
N16
Broadcom Corporation
Document 5228-DS09-405-R
Hardware Signal Definition Table
Page 17
BCM5228
Data Sheet
7/12/04
Broadcom Corporation
Page 18
Hardware Signal Definition Table
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Section 3: Pinout Diagrams
The the pinout diagram for the BCM5228F (FX Support) is illustrated on Figure 2.
FDXEN
DGND
DVDD
OGND
RXD0{1}
RXD1{1}
TXD0{1}
TXD1{1}
RXD0{2}
RXD1{2}
TXD0{2}
TXD1{2}
OVDD
OVDD
RXD0{3}
RXD1{3}
TXD0{3}
TXD1{3}
RXD0{4}
RXD1{4}
TXD0{4}
TXD1{4}
OGND
156
155
154
153
152
151
150
149
148
147
146
145
144
143
142
141
140
139
138
137
136
135
134
133
DGND
1
2
3
4
5
6
7
8
9
DVDD
TXEN{2}
TXEN{1}
RXER{4}
RXER{3}
RXER{2}
RXER{1}
TXER{4}
TXER{3}
TXER{2}
TXER{1}
OVDD
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
DGND
DVDD
OVDD
TESTEN
LC_SER_EN
TXER_EN
MDIX_DIS
SER_EN
MASTERPHY
SMII_EN
DGND
DVDD
OGND
PHYAD4
PHYAD3
PHYAD2
PHYAD1
PHYAD0
NC
132
131
130
129
RXD0{5}
RXD1{5}
TXD0{5}
TXD1{5}
RXD0{6}
RXD1{6}
TXD0{6}
TXD1{6}
OVDD
BCM5228
(Top View)
F
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
SLED_DO
MDC
MDIO
TDO
TRST#
TMS
TCK
TDI
OGND
OVDD
RXER{8}
RXER{7}
RXER{6}
RXER{5}
TXER{8}
TXER{7}
OVDD
RXD0{7}
RXD1{7}
TXD0{7}
TXD1{7}
RXD0{8}
RXD1{8}
TXD0{8}
TXD1{8}
OGND
DVDD
DGND
TXER{6}
TXER{5}
DVDD
DGND
TXEN{8}
109 F100
108 ANEN
107 SMII_RSYNC
106 SMII_RXC
105 SSYNC
50
51
52
TXEN{7}
TXEN{6}
Figure 2: BCM5228F Pinout Diagram
The pinout diagram for the BCM5228U (UTP Support) is illustrated on Figure 3 on page 20.
Broadcom Corporation
Document 5228-DS09-405-R
Pinout Diagrams
Page 19
BCM5228
Data Sheet
7/12/04
FDXEN
DGND
DVDD
OGND
RXD0{1}
RXD1{1}
TXD0{1}
TXD1{1}
RXD0{2}
RXD1{2}
TXD0{2}
156
155
154
153
152
151
150
149
148
147
146
145
144
143
142
141
140
139
138
137
136
135
134
133
DGND
1
2
3
4
5
6
7
8
DVDD
TXEN{2}
TXEN{1}
RXER{4}
RXER{3}
RXER{2}
RXER{1}
TXER{4}
TXER{3}
TXER{2}
TXER{1}
OVDD
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
TXD1{2}
OVDD
OVDD
DGND
DVDD
OVDD
RXD0{3}
RXD1{3}
TXD0{3}
TXD1{3}
RXD0{4}
RXD1{4}
TXD0{4}
TXD1{4}
OGND
TESTEN
LC_SER_EN
TXER_EN
MDIX_DIS
SER_EN
MASTERPHY
SMII_EN
PHYAD4
PHYAD3
DGND
DVDD
OGND
132
131
130
129
PHYAD2
PHYAD1
PHYAD0
NC
RXD0{5}
RXD1{5}
TXD0{5}
TXD1{5}
RXD0{6}
RXD1{6}
TXD0{6}
TXD1{6}
OVDD
BCM5228U
(Top View)
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
SLED_DO
MDC
MDIO
TDO
TRST#
TMS
TCK
TDI
OGND
OVDD
RXER{8}
RXER{7}
RXER{6}
RXER{5}
TXER{8}
TXER{7}
OVDD
RXD0{7}
RXD1{7}
TXD0{7}
TXD1{7}
RXD0{8}
RXD1{8}
TXD0{8}
TXD1{8}
OGND
DVDD
DGND
TXER{6}
TXER{5}
DVDD
DGND
TXEN{8}
109 F100
108 ANEN
SMII_RSYNC
106 SMII_RXC
107
50
51
52
TXEN{7}
TXEN{6}
105
SSYNC
Figure 3: BCM5228U Pinout Diagram
Broadcom Corporation
Page 20
Pinout Diagrams
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
CRS_DV CRS_DV CRS_DV
A
B
C
D
E
F
TXEN{4}
AVDD
TD+{4}
RD+{4}
RD+{3}
TD+{3}
TD+{2}
RD+{2}
RD+{1}
TD+{1}
VREF
RDAC
BIASVDD
BIASGND
RESET#
A
B
C
D
E
F
{1}
{2}
{4}
T
T
R
R
T
T
T
S
CRS_DV
{3}
TXEN{3} TXEN{2} LED3{2}
AGND
LED2{4}
LED2{3}
LED3{3}
TD-{4}
AGND
OVDD
LED2{2}
OGND
DGND
TGND
RD-{4}
AVDD
SD-{4}
SD+{4}
OGND
TGND
RD-{3}
AGND
SD+{3}
SD-{3}
TGND
TGND
TGND
TGND
TGND
TGND
NC
TD-{3}
AGND
AGND
AGND
TGND
TGND
TGND
TGND
TGND
TGND
SD-{5}
SD+{5}
AGND
TD-{7}
TD-{2}
AVDD
A GND
NC
RD-{2}
AGND
SD+{2}
SD-{2}
TGND
TGND
OGND
TGND
TGND
TGND
SD-{7}
SD+{7}
AVDD
RD-{8}
RD-{1}
AGND
SD+{1}
SD-{1}
TD-{1}
AVDD
OGND
DVDD
AGND
DGND
AGND
RXER{4} RXER{3} TXEN{1} LED2{1}
FDXEN
RXER{2} RXER{1} LED3{1}
LED3{4}
DVDD
RXD1{1} RXD0{1} TXD1{1}
RXD1{2} RXD0{2} TXD0{1}
TX_ER{3}/ TX_ER{4}/
OVDD
LED1{3}
LED1{4}
TX_ER{1}/ TX_ER{2}/
DGND
TESTEN MDIX_DIS
TGND
TGND
TGND
TGND
TGND
TGND
SD-{6}
SD+{6}
AGND
RD-{7}
RXD1{3} RXD0{3}
OVDD
TXD1{2} TXD0{2}
LED1{1}
LED1{2}
LC_SER_
EN
SERIAL_EN
G
H
J
TXER_EN
DVDD
PHY AD4
RXD1{4}
OVDD
RXD0{4} TXD1{3} TXD0{3}
G
H
J
SMII_EN/ MASTERP
SLED_CL
K
HY/
SFRAME
OVDD
PHYAD0
OVDD
TMS
PHYAD2 PHYAD3
TGND
RXD1{5} RXD0{5}
OGND
TXD1{4} TXD0{4}
MDIO
MDC
NC
OGND
TDO
PHYAD1
TRST#
TCK
TGND
TGND
RXD1{6}
DGND
RXD0{6} TXD1{5} TXD0{5}
M
M
R
R
T
T
T
SLED_DO/
INTR#
K
L
TGND
TGND
RXD1{7} RXD0{7}
DVDD
TXD1{6} TXD0{6}
K
L
RXER{8}
TDI
DVDD
LED3{8}
OGND
LED2{7}
LED2{8}
AGND
RD-{5}
OGND
LED2{5}
LED2{6}
AVDD
RD-{6}
RXD1{8}
SD-{8}
SD+{8}
AGND
TD-{8}
OVDD
ANEN
DVDD
AGND
AGND
RXD0{8} TXD1{7} TXD0{7}
PLLVDDP TXD1{8} TXD0{8}
M
N
P
R
T
RXER{6} RXER{7}
TX_ER{8}/ TX_ER{7}/
DGND
LED3{5}
LED3{7}
AGND
TD-{5}
M
N
P
R
T
RXER{5} LED3{6}
TXEN{8} TXEN{7}
OVDD
AGND
TD-{6}
DGND
F100
OGND
LED1{8}
LED1{7}
TX_ER{5}/ TX_ER{6}/
SMII_
RSYNC
PLLVDDP SSYNC
PLLGND SSMII_EN
LED1{5}
LED1{6}
CRS_DV CRS_DV
{6} {5}
SMII_
RXC
TXEN{6}
AGND
CRS_DV CRS_DV
SMII_
TXC
TXEN{5}
01
AVDD
04
TD+{5}
05
RD+{5}
06
RD+{6}
07
TD+{6}
08
TD+{7}
09
RD+{7}
10
RD+{8}
11
TD+{8}
12
AVDD PLLVDDC REF_CLK
{8}
{7}
T
C
02
03
13
14
15
16
T
R
R
Note: TGND balls are thermal grounds
Figure 4: BGA Pinout (Top View)
Broadcom Corporation
Document 5228-DS09-405-R
Pinout Diagrams
Page 21
BCM5228
Data Sheet
7/12/04
Table 3: BGA Ballout by Signal Name
Signal Name
Ball
Signal Name
Ball
Signal Name
Ball
AGND
B05
B14
B15
C06
C08
C09
C11
C12
D09
D10
E09
P05
P06
P08
P09
P10
P12
P13
R04
R13
M13
A05
C07
C10
C13
P07
P11
T04
T13
B16
A16
A02
A03
B04
A04
CRS_DV{5}
CRS_DV{6}
CRS_DV{7}
CRS_DV{8}
DGND
R03
R02
T03
T02
C14
F03
G06
J13
MASTERPHY/SFRAME
MDC
H02
K01
J01
AGND
AGND
MDIO
AGND
MDIX_DIS
NC
F05
E10
J02
M08
D13
F06
F07
H11
H14
J04
AGND
AGND
DGND
NC
AGND
DGND
NC
AGND
DGND
OGND
AGND
DGND
M03
N14
E04
E13
G04
K14
L04
N13
N15
C15
G02
C04
E06
D05
C05
M07
N07
M06
N06
D03
B03
E05
D04
M05
N04
N05
M04
OGND
AGND
DGND
OGND
AGND
DVDD
OGND
AGND
DVDD
OGND
AGND
DVDD
OGND
AGND
DVDD
OGND
L06
L07
N16
D06
E03
F14
G13
H03
K03
L13
M14
N08
P14
J03
AGND
DVDD
OGND
AGND
DVDD
OGND
AGND
F100
OVDD
AGND
FDXEN
LC_SER_EN
LED2{1}
LED2{2}
LED2{3}
LED2{4}
LED2{5}
LED2{6}
LED2{7}
LED2{8}
LED3{1}
LED3{2}
LED3{3}
LED3{4}
LED3{5}
LED3{6}
LED3{7}
LED3{8}
OVDD
AGND
OVDD
AGND
OVDD
ANEN
OVDD
AVDD
OVDD
AVDD
OVDD
AVDD
OVDD
AVDD
OVDD
AVDD
PLLVDDP
PHYAD0
PHYAD1
PHYAD2
PHYAD3
PHYAD4
PLLGND
PLLVDDC
RD–{1}
RD–{2}
AVDD
AVDD
J05
AVDD
H04
H05
G05
R14
T14
B12
B11
BIASGND
BIASVDD
CRS_DV{1}
CRS_DV{2}
CRS_DV{3}
CRS_DV{4}
Broadcom Corporation
Page 22
Pinout Diagrams
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Table 3: BGA Ballout by Signal Name (Cont.)
Signal Name
Ball
Signal Name
Ball
Signal Name
Ball
RD-{3}
B08
B07
R06
R07
R10
R11
A12
A11
A08
A07
T06
T07
T10
T11
A15
T15
C16
D15
E15
F13
G14
H13
J14
RXER{4}
RXER{5}
RXER{6}
RXER{7}
RXER{8}
SD-{1}
C01
N03
M01
M02
L01
E12
E11
E08
D07
M09
M10
M11
M12
D12
D11
D08
E07
N09
N10
N11
N12
G03
K02
P16
R16
T16
H01
R15
P15
L05
B13
B10
B09
B06
R05
R08
TD–{7}
TD–{8}
TD+{1}
TD+{2}
TD+{3}
TD+{4}
TD+{5}
TD+{6}
TD+{7}
TD+{8}
TDI
R09
R12
A13
A10
A09
A06
T05
T08
T09
T12
L02
K04
F04
F08
F09
F10
F11
G07
G08
G09
G10
G11
H06
H07
H08
H09
H10
J06
J07
J08
J09
J10
J11
K06
K07
K08
RD-{4}
RD-{5}
RD-{6}
RD-{7}
RD-{8}
RD+{1}
SD-{2}
RD+{2}
SD-{3}
RD+{3}
SD-{4}
RD+{4}
SD-{5}
RD+{5}
SD-{6}
RD+{6}
SD-{7}
TDO
RD+{7}
SD-{8}
TESTEN
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
TGND
RD+{8}
SD+{1}
RDAC
SD+{2}
REF_CLK
RESET#
RXD0{1}
RXD0{2}
RXD0{3}
RXD0{4}
RXD0{5}
RXD0{6}
RXD0{7}
RXD0{8}
RXD1{1}
RXD1{2}
RXD1{3}
RXD1{4}
RXD1{5}
RXD1{6}
RXD1{7}
RXD1{8}
RXER{1}
RXER{2}
RXER{3}
SD+{3}
SD+{4}
SD+{5}
SD+{6}
SD+{7}
SD+{8}
SERIAL_EN
SLED_DO/INTR#
SMII_RSYNC
SMII_RXC
SMII_TXC
SMII_EN/SLED_CLK
SSMII_EN
SSYNC
TCK
K13
L14
D14
E14
F12
G12
H12
J12
TD-{1}
K12
L12
D02
D01
C02
TD-{2}
TD-{3}
TD-{4}
TD-{5}
TD-{6}
Broadcom Corporation
Document 5228-DS09-405-R
Pinout Diagrams
Page 23
BCM5228
Data Sheet
7/12/04
Table 3: BGA Ballout by Signal Name (Cont.)
Signal Name
Ball
Signal Name
Ball
Signal Name
Ball
TGND
K09
K10
K11
L08
L09
L10
L11
L03
K05
E16
F16
G16
H16
J16
K16
TXD0{7}
TXD0{8}
TXD1{1}
TXD1{2}
TXD1{3}
TXD1{4}
TXD1{5}
TXD1{6}
TXD1{7}
TXD1{8}
TXEN{1}
TXEN{2}
TXEN{3}
TXEN{4}
TXEN{5}
L16
M16
D16
F15
G15
H15
J15
TXEN{6}
R01
P04
P03
G01
F01
F02
E01
E02
P01
P02
N02
N01
A14
TGND
TXEN{7}
TGND
TXEN{8}
TGND
TXER_EN
TGND
TX_ER{1}/LED1{1}
TX_ER{2}/LED1{2}
TX_ER{3}/LED1{3}
TX_ER{4}/LED1{4}
TX_ER{5}/LED1{5}
TX_ER{6}/LED1{6}
TX_ER{7}/LED1{7}
TX_ER{8}/LED1{8}
VREF
TGND
TGND
TMS
K15
L15
M15
C03
B02
B01
A01
T01
TRST#
TXD0{1}
TXD0{2}
TXD0{3}
TXD0{4}
TXD0{5}
TXD0{6}
Broadcom Corporation
Page 24
Pinout Diagrams
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Section 4: Operational Description
RESETTING THE BCM5228
There are two ways to reset each transceiver in the BCM5228. A hardware reset pin has been provided which resets all
internal nodes inside the chip to a known state. The reset pulse must be asserted for at least 2 µs. Hardware reset should
always be applied to a BCM5228 after power-up and after all clocks to the chip are running.
Each transceiver in the BCM5228 also has an individual software reset capability. To perform software reset, a 1 must be
written to bit 15 of the MII Control register 0 (see “MII Register Map Summary” on page 37) of the transceiver. This bit is self-
clearing, meaning that a second write operation is not necessary to end the reset. There is no effect if a 0 is written to this bit.
LOOPBACK MODE
The loopback mode allows in-circuit testing of the BCM5228 chip. All packets sent in through the TXD pins are looped-back
internally to the RXD pins, and are not sent out to the cable. Incoming packets on the cable are ignored.
The loopback mode can be entered by writing a 1 to bit 14 of the MII Control register or by writing a 1 to bit 8 and bit 7 of
shadow register 1Dh. In order to resume normal operation the bits must be 0.
Several function bypass modes are also supported which can provide a number of different combinations of feedback paths
during loopback testing. These bypass modes include: bypass scrambler, bypass MLT3 encoder and bypass 4B5B encoder.
FULL-DUPLEX MODE
The BCM5228 supports full-duplex operation. While in full-duplex mode, a transceiver can simultaneously transmit and
receive packets on the cable. By default, each transceiver in the BCM5228 powers up in half-duplex mode.
When auto-negotiation is disabled, full-duplex operation can be enabled either by a pin (FDXEN) or by an MII register bit
(register 0 bit 8).
When auto-negotiation is enabled in DTE mode, full-duplex capability is advertised by default but can be overridden by a
write to the auto-negotiation Advertisement register (04h).
100BASE-FX MODE
Any of the BCM5228F transceivers can interface with an external 100BASE-FX fiber-optic driver and receiver instead of the
magnetics module used with twisted-pair cable. The differential transmit and receive data pairs operate at PECL voltage
levels instead of those required for twisted-pair transmission, if the termination scheme recommended in the application note
Broadcom Corporation
Document 5228-DS09-405-R
Operational Description
Page 25
BCM5228
Data Sheet
7/12/04
is used. The data is encoded using two-level NRZI instead of three-level MLT3. The data stream is not scrambled for fiber-
optic transmission. The stream cipher function is bypassed when 100BASE-FX mode is selected.
The external fiber-optic receiver detects signal status and communicate it to the BCM5228B or BCM5228F through the SD
pins. In this mode, the internal signal detect function is bypassed. The 100BASE-FX mode is automatically selected
whenever a valid differential signal is detected at the SD input pins. Pulling both SD+ and SD– low simultaneously disables
the 100BASE-FX mode.
10BASE-T MODE
The same magnetics module is used to interface the twisted-pair cable in 10BASE-T mode and in 100BASE-TX mode. The
data is two-level Manchester coded instead of three-level MLT3 and no scrambling/descrambling or 4B5B coding is
performed.
Data and clock rates are decreased by a factor of 10, with the RMII interface operating at 2.5 MHz.
ISOLATE MODE
Each transceiver in the BCM5228 can be isolated from the RMII/SMII/S3MII interface. When a transceiver is put into isolate
mode, all RMII/SMII/S3MII input pins (TXD0, TXD1, TX_EN, TX_ER, SSYNC, SMII_TXC) are ignored and all RMII/SMII/
S3MII output pins (CRS_DV, RX_ER, RXD0, RXD1, SMII_RSYNC, SMII_RXC) are set at high impedance. MII management
pins (MDC, MDIO,) and analog TD±, RD± pins operate normally. Writing a 1 to bit 10 of the MII Control register 0 puts the
port into isolate mode. Writing a 0 to the same bit removes it from isolate mode. Upon resetting the chip or resetting the
isolated port, the isolate mode is off.
SUPER ISOLATE MODE
When the chip is in super isolate mode, in addition to isolate mode actions, the chip also sets the analog TD± pins to high
impedance. Writing a 1 to bit 3 of the MII register 1Eh puts the port into super isolate mode. Writing a 0 to the same bit
removes it from super isolate mode. Upon resetting the chip or resetting the isolated port, the super isolate mode is off.
AUTO POWER-DOWN MODE
The BCM5228 supports a low power mode called auto power-down mode. Auto power-down mode is enabled by setting bit
5 of shadow register 1Bh. When in this mode, the BCM5228 automatically enters the low power mode if the energy from the
link partner is lost. Similarly, the next time energy is detected, the chip resumes full power mode. When the BCM5228 is in
this low power mode, it wakes up after approximately 2.5 to 5.0 seconds, as determined by bit 4 of shadow register 1Bh, and
sends a link pulse while monitoring energy from the link partner. If energy is detected, the BCM5228 enters full power mode
and establishes link with the link partner. Otherwise, the wake-up mode continues for a duration of approximately 40–600
milliseconds, as determined by bits [3:0] of shadow register 1Bh before going to low power mode. See Table 43 on page 66
for details of various bits.
Broadcom Corporation
Page 26
10BASE-T Mode
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
JUMBO PACKET MODE
In 100BASE-X mode, the BCM5228 can support jumbo packet size. The size of the packet that can be handled reliably
depends on the descrambler lock timer settings and the receive FIFO size. By default, the BCM5228 provides an effective
10 bits of receive FIFO to allow for extremely large packet sizes. These modes are enabled by setting appropriate bits in the
MII registers. Table 4 shows the number of effective FIFO bits supported.
Table 4: Receive FIFO Size Select
Packet Size
(bytesb)
Jumbo Packet FIFO Enable
Reg 1Bh bit 9
Extended FIFO Enable
Reg 10h bit 2
Number of Effective
FIFO Bits Supported
0
0
1
1
0
1
0
1
10
20
20
12 500
25 000
25 000
40 (20a)
50 000/25 000
a. In this mode, the BCM5228 operation is guaranteed to only 20 bits of effective FIFO depth, although under some
circumstances, it could behave as if the FIFO depth is 40 bits.
b. The packet size calculation is based on 50 ppm clock tolerance for local and link partner.
When changing the receive FIFO size, it is necessary to identify the receive packet size requirement and set the descrambler
timer lock accordingly. The descrambler lock is controlled by the Jumbo Packet Enable bit located in register 1HBh, bit 10.
Table 5: Jumbo Packet Enable and Descrambler Lock Timer
Jumbo Packet Enable
Descrambler Lock Timer
Packet Size
Reg 1Bh bit 10
0
1
720 µs
5792 µs
9050
72 400
The packet size that can be reliably received is the lower number indicated by two settings: the Jumbo Packet Enable bit
and the two Extended FIFO Enable bits.
PHY ADDRESS
Each transceiver in the BCM5228 has a unique PHY address for MII management. The PHY address is determined by the
using the base address, which is input on the PHYAD[4:0] pins. The following shows the addressing of the eight PHYs.
PHY0 = PHYAD + 0, PHY1 = PHYAD + 1,... PHY7 = PHYAD + 7
Every time an MII write or read operation is executed, the transceiver compares the PHY address with its own PHY address
definition. The operation is executed only when the addresses match.
Broadcom Corporation
Document 5228-DS09-405-R
Jumbo Packet Mode
Page 27
BCM5228
Data Sheet
7/12/04
HP AUTO-MDIX
During auto-negotiation and in various operating modes, one end of the link must be configured as an MDI (Media
Independent Interface) crossover so that each transceiver’s transmitter is connected to the other’s receiver. The BCM5228
contains the ability to perform HP Auto-MDIX crossover, thus eliminating the need for crossover cable or cross-wired (MDIX)
ports.
During auto-negotiation and in various operating modes, the BCM5228 normally transmits on TD± and receives on RD±.
When connected via a straight-through cable to another device that does not have HP Auto-MDIX, the BCM5228
automatically switches its transmitter to RD± and its receiver to TD± to communicate with that device. If the link partner also
has HP Auto-MDIX, then a random algorithm determines which end performs the crossover function.
The HP Auto-MDIX feature is implemented in accordance with the IEEE 802.3ab specification. The HP Auto-MDIX crossover
feature is a function of auto-negotiation. Therefore, if the BCM5228 is configured not to perform auto-negotiation, HP Auto-
MDIX crossover does not work, and a specific cable is required to ensure that each transceiver’s transmitter is connected
to the other’s receiver.
The HP Auto-MDIX feature is enabled in hardware by pulling the MDIX_DIS pin low during power-on reset. If enabled by
hardware, this feature can be disabled by setting bit 11 of the MII register 1Ch to 0.
Broadcom Corporation
Page 28
HP Auto-MDIX
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Section 5: LED Modes
DESCRIPTION
The BCM5228 offers a rich set of LED display outputs through serial and parallel LED modes. There are two serial LED
modes available, Serial LED mode and Low-Cost Serial LED mode. The serial LED mode provides compatibility with few
other Broadcom PHYs. Serial LED modes are selected by hardware only during power-on reset. When any serial LED mode
is enabled global hardware interrupt feature is not available. However, if interrupt and a serial or a Low-Cost Serial LED
mode is desired simultaneously, then a parallel LED can be programmed to provide on interrupt output per port and eight
such interrupt can be ORed to obtain a global interrupt.
SERIAL LED MODE
The Serial LED mode is enabled only by having the SER_EN pin high and the LC_SER_EN pin low during power-on reset.
If Serial LED mode is enabled, then the Low-cost Serial LED mode and hardware global interrupt are disabled. In Serial LED
mode, the BCM5228 sources a serial data stream, the associated clock, and a framing signal as follows:
•
•
Serial data stream, SLED_DO, which is an active low bit stream containing 48 bits per frame.
Serial data clock, SLED_CLK, is used to clock out SLED_DO on the falling edge of this clock. SLED-DO is valid on the
rising edge of this clock. SLED_CLK is approximately 3.125 MHz in forced 100BASE-T and -FX modes, and 2.5 MHz in
all other modes.
•
Framing pulse, SFRAME, which is a logic high pulse occurring once every 48 SLED_DO bit times. SFRAME goes high
coincident with bit 0 of port 1.
When the serial LED mode is enabled by hardware, the LED stream is selected for SLED_DO as shown in Table 6,
depending on the values of bits 14 and 15 of MII register 1Ah. The data stream contains bit 0 to bit 5 for port 1, bit 0 to bit 5
for port 2, … and bit 0 to bit 5 for port 8.
Table 6: Serial LED Mode Bit Framing
Reg 1Ah
Serial Bit 5 Serial Bit 4
COL
Serial Bit 3
Serial Bit 2
Serial Bit 1
Serial Bit 0
Bit 15 = 0 Bit 14 = 0 FDX
Speed100
Link
Link
Link
Link
Transmit
Port Interrupt
FDX
Receive
Activity
Activity
Activity
Bit 15 = 0
Bit 15 = 1
Bit 15 = 1
Bit 14 = 1 FDX
Bit 14 = 0 FDX
Bit 14 = 1 FDX
Global Interrupt Speed100
COL Speed100
Global Interrupt Speed100
FDX
NOTE—A global interrupt indicates an interrupt from any of the eight PHYs as if they were ORed together. A port interrupt
is provided on a per-PHY basis.
Broadcom Corporation
Document 5228-DS09-405-R
LED Modes
Page 29
BCM5228
Data Sheet
7/12/04
LOW-COST SERIAL LED MODE
The low-cost serial LED mode is enabled by pulling both LC_SER_EN pin and SER_EN pin high during power-on reset.
When enabled, serial LED data stream, SLED_DO, is shifted out on the falling edge of SLED_CLK. SLED_DO is valid on
the rising edge of this clock. The data is shifted in such a manner that the update of LEDs using a simple shift register that
drive the display LEDs do not cause noticeable flicker in normal operation.
There are six banks, bank 1 through bank 6, associated with six LED outputs. Each bank has its own MII register bits that
select LED a signal to output from that bank. The selected signal from each bank is shifted out on the LED_DO pin in the
following order for a total of 48 LED outputs:
•
•
•
Bank 1 for port 1 through port 8
Bank 2 for port 1 through port 8,…,
Bank 6 for port 1 through 8
The low-cost serial LED mode programmable banks are located in the MII shadow register 1Ah of port 2 and port 3. For
programming details, see Table 7, Table 8, Table 9, Table 10, Table 11, and Table 12. The default LED outputs are Speed,
Link, Full-duplex, Activity, Speed, and Link for bank 1 through bank 6, respectively.
Table 7: Low-Cost Serial Mode Bank 1 LED Selection
MII Shadow Registera 1Ah, PHY 3, Bits [2:0]
Value
LED Selection
0
1
2
3
4
5
6
7
Speed
Activity
Full-duplex
Transmit
Receive
Interrupt
Collision
Link
SERIAL BANK 1 SELECT
BITS[2:0]
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Table 8: Low-Cost Serial Mode Bank 2 LED Selection
MII Shadow Registera 1Ah, PHY 3, Bits [5:3]
Value
LED Selection
0
1
2
3
4
5
6
7
Link
Speed
Activity
Full-duplex
Transmit
Receive
Interrupt
Collision
SERIAL LED BANK 2 SELECT
BITS[2:0]
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Broadcom Corporation
Page 30
Low-Cost Serial LED Mode
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Table 9: Low-Cost Serial Mode Bank 3 LED Selection
MII Shadow Registera 1Ah, PHY 3, Bits [8:6]
Value
LED Selection
0
1
2
3
4
5
6
7
Full-duplex
Transmit
Receive
Interrupt
Collision
Link
SERIAL LED BANK 3 SELECT
BITS[2:0]
Speed
Activity
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Table 10: Low-Cost Serial Mode Bank 4 LED Selection
MII Shadow Registera 1Ah, PHY 2, Bits [2:0]
Value
LED Selection
0
1
2
3
4
5
6
7
Activity
Full-duplex
Transmit
Receive
Interrupt
Collision
Link
SERIAL LED BANK 4 SELECT
BITS[2:0]
Speed
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Table 11: Low-Cost Serial Mode Bank 5 LED Selection
MII Shadow Registera 1Ah, PHY 2, Bits [5:3]
Value
LED Selection
0
1
2
3
4
5
6
7
Speed
Activity
Full-duplex
Transmit
Receive
Interrupt
Collision
Link
SERIAL LED BANK 5 SELECT
BITS[2:0]
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Broadcom Corporation
Document 5228-DS09-405-R
Low-Cost Serial LED Mode
Page 31
BCM5228
Data Sheet
7/12/04
Table 12: Low-Cost Serial Mode Bank 6 LED Selection
MII Shadow Register a1Ah, PHY 2, Bits [8:6]
Value
LED Selection
0
1
2
3
4
5
6
7
Link
Speed
Activity
Full-duplex
Transmit
Receive
Interrupt
Collision
SERIAL BANK 6 SELECT
BITS[2:0]
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Broadcom Corporation
Page 32
Low-Cost Serial LED Mode
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
PARALLEL LED MODE
The BCM5228U offers a parallel LED mode that is active all the time. There are 3 LED pins, LED1, LED2, and LED3 for
each port each of which can be individually configured to output one of many LED signals. Configuration can be
accomplished either by hardware or programming MII register bits. LED1 pins are shared with TXER. These pins can be
configured to output LED1 if TXER_EN pin is pulled low during power-on reset.
For unmanaged system design using the BCM5228U, the parallel LED pins for each port can be programmed through
hardware during power-on reset by pull-down or pull-up combinations of TXER/LED1 [1:8] pins. Pull-up and pull-down of
these pins should be done using a series 4.7-kΩ resistor to OVDD or OGND respectively and LED drive and polarity should
be such that the active low output on LED1 lights up the LED. LED2 and LED3 can be configured to output one of Link,
Speed, Activity, Full-duplex, Transmit, Receive, Interrupt or Collision while LED3 can be configured to be one of Activity,
Full-duplex, Link or Speed. Software configuration of LED1, LED2 and LED3 is accomplished through MII shadow register
1Ah, Phy 1, bits [7:0]. For details, see Table 13, Table 14, and Table 15. Because LED2{1:8} pins are open drain, they can
be wire 0Red together and configured (by hardware during power-on reset or through software by setting bits in the MII
shadow register) to provide global hardware interrupt when required.
Table 13: Parallel LED Mode LED1 Selection
MII Shadow Registera 1Ah, PHY 1, Bits [2:0]
TXER[3:1]
Value
LED1 Selection
0
1
2
3
4
5
6
7
Link
Speed
Activity
Full-duplex
Transmit
Receive
Interrupt
Collision
POWER-ON
LED1 SELECT
BITS[2:0]
LED1 SELECT[2:0]
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Table 14: Parallel LED Mode LED2 Selection
Value
MII Shadow Registera 1Ah, PHY 1, Bits [5:3]
TXER [6:4]
LED2 Selection
0
1
2
3
4
5
6
7
Speed
Activity
Full-duplex
Transmit
Receive
Interrupt
Collision
Link
POWER-ON
RESET LED2
SELECT[2:0]
LED2 SELECT[2:0]
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Broadcom Corporation
Document 5228-DS09-405-R
Parallel LED Mode
Page 33
BCM5228
Data Sheet
7/12/04
Table 15: Parallel LED Mode LED3 Selection
a
TXER [8:7]
Value
LED3 Selection
MII Shadow Register 1Ah, PHY 1, Bits [7:6]
0
1
2
3
Activity
Full-duplex
Link
POWER-ON RESET
LED3 SELECT[1:0]
LED3 SELECT[1:0]
Speed
a. The MII Shadow register is accessed by setting MII register 1Fh bit 7 to 1.
Broadcom Corporation
Page 34
Parallel LED Mode
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Section 6: Register Summary
MII MANAGEMENT INTERFACE: REGISTER PROGRAMMING
The BCM5228 fully complies with the IEEE 802.3u Media Independent Interface (MII) specification. The MII management
interface registers of each port are serially written-to and read from using a common set of MDIO and MDC pins. A single
clock waveform must be provided to the BCM5228 at a rate of 0–25 MHz through the MDC pin. The serial data is
communicated on the MDIO pin. Every MDIO bit must have the same period as the MDC clock. The MDIO bits are latched
on the rising edge of the MDC clock. Every MII read or write instruction frame contains the following fields:
Table 16: MII Management Frame Format
Operation
PRE
ST
OP
PHYAD
REGAD
TA
Data
Idle
Direction
Read
1 ... 1
01
10
AAAAA
RRRRR
ZZ
Z0
Z ... Z
D ... D
Z
Z
Driven to BCM5228
Driven by BCM5228
Write
1 ... 1
01
01
AAAAA
RRRRR
10
D ... D
Z
Driven to BCM5228
Preamble (PRE). Thirty-two consecutive 1 bits must be sent through the MDIO pin to the BCM5228 to signal the beginning
of an RMII instruction. Fewer than thirty-two 1 bits causes the remainder of the instruction to be ignored.
Start of Frame (ST). A 01 pattern indicates that the start of the instruction follows.
Operation Code (OP). A Read instruction is indicated by 10, while a Write instruction is indicated by 01.
PHY Address (PHYAD). A 5-bit PHY address follows next, with the MSB transmitted first. The PHY address allows a single
MDIO bus to access multiple PHY chips. The BCM5228 supports a complete address space with PHYAD[4:0] input-pins
used as the base address for selecting one of the eight transceivers.
Register Address (REGAD). A 5-bit register address follows, with the MSB transmitted first. The register map of the
BCM5228, containing register addresses and bit definitions, are provided on the following pages.
Turnaround (TA). The next two bit times are used to avoid contention on the MDIO pin when a Read operation is performed.
For a Write operation, 10 must be sent to the BCM5228 chip during these two bit times. For a Read operation, the MDIO pin
must be placed into High-Impedance during these two bit times. The chip drives the MDIO pin to 0 during the second bit time.
Data. The last 16 bits of the frame are the actual data bits. For a Write operation, these bits are sent to the BCM5228,
whereas, for a read operation, these bits are driven by the BCM5228. In either case, the MSB is transmitted first. When
writing to the BCM5228, the data field bits must be stable 10 ns before the rising edge of MDC, and must be held valid for
10 ns after the rising edge of MDC. When reading from the BCM5228, the data field bits are valid after the rising-edge of
MDC until the next rising edge of MDC.
Idle. A high impedance state of the MDIO line. All tri-state drivers are disabled and the PHY’s pull-up resistor pulls the MDIO
line to logic 1.
Broadcom Corporation
Document 5228-DS09-405-R
Register Summary
Page 35
BCM5228
Data Sheet
7/12/04
At least one or more idle states are required between frames. The following shows two examples of MII write and read
instructions.
•
To put a transceiver with PHY address 00001 into Loopback mode, the following MII write instruction must be issued:
1111 1111 1111 1111 1111 1111 1111 1111 0101 00001 00000 10 0100 0000 0000 0000 1...
•
To determine if a PHY is in the link pass state, the following MII read instruction must be issued:
1111 1111 1111 1111 1111 1111 1111 1111 0110 00001 00001 ZZ ZZZZ ZZZZ ZZZZ ZZZZ 1...
For the MII read operation, the BCM5228 drives the MDIO line during the TA and Data fields (the last 17 bit times). A final
65th clock pulse must be sent to close the transaction and cause a write operation to take place.
Broadcom Corporation
Page 36
MII Management Interface: Register Programming
Document 5228-DS09-405-R
MII REGISTER MAP SUMMARY
Table 17 contains the MII register map summary for each port of the BCM5228. The register addresses are specified in hex form, and the name of register bits
have been abbreviated. When writing to any register, preserve existing values of the reserved bits by completing a “Read/Modify Write.” Ignore reserved bits when
reading registers. Never write to an undefined register. The reset values of the registers are shown in the INIT column. Some of these values could be different
depending on how the device is configured and also depending on the device revision value.
Table 17: MII Register Map Summary
Addr Name
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Init
00h
Control
Soft
Reset
Loopback
Force100
Auto-neg
Enable
Power
Down
Isolate
Restart Full-duplex Collision
Reserved
3000h
Auto-neg
Test
01h
Status
T4
Capable
TX FDX
Capable
TX
Capable
BASE-T 10BASE-T
Reserved
MF pream
suppress
Auto-neg
comp
Remote
Fault
Auto-neg
Capable
Link
Status
Jabber
Detect
Extd Reg 7809h
Capable
FDX
Capable
Capable
02h
03h
PhyID High
PhyID Low
0
0
0
1
0
1
0
0
0
0
0
0
0
0
0
1
0
1
1
0
0
1
0
0
0
0
0
0040h
61D0h
Model #
1
Revision #
0
0
0
0
0
04h
05h
Aut-neg
Advertise
Next
Page
Reserved
Remote
Fault
Reserved Tech
Pause
Adv
T4
Adv
TX FDX
Adv
TX
Adv
BASE-T
FDX
Adv
BASE-T
Advertised Selector Field[4:0]
0
01E1h
0000h
0
0
1
Link Partner
Ability
LP Next
Page
LP
LP Rem
Fault
Reserved Tech
LP
Pause
LP
T4
LP
TX FDX
LP
TX
LP
BASE-T
FDX
LP
BASE-T
Link Partner Selector Field [4:0]
Acknowledge
06h
07h
08h
10h
Auto-neg
Reserved
Toggle
Par Det
Fault
LP Next
Pg Able
Next Pg
Able
Page
LP Auto- 0004h
neg Able
Expansion
Recvd
Next Page
Next
Reserved
Reserved
Message
Page
Acknowledge2
Acknowledge2
Reserved
Message/Unformatted Code Field
2001h
Page
LP Next Page
Next
Page
Message
Page
Toggle
Message/Unformatted Code Field
0000h
100BASE-X
Aux Control
Reserved
Trans
Disable
Bypass
4B5B
Enc/Dec
Bypass
Scram/
Bypass
NRZI
Bypass
Rcv Sym
Align
Baseline
Wander
Disable
FEF
Reserved
Extended
FIFO
Enable
Reserved
0000h
0000h
Enable
Descram
Enc/Dec
11h
100BASE-X
Aux Status
Reserved
R/SMII
FX Mode
Locked
Current
100 Link
Status
Current
Remote
Fault
Reserved
False
Carrier
Detected
Bad
RCV
Error
Detected
XMT
Error
Detected
Lock
Error
Detected
MLT3
Error
Detected
Over
Under
Run
ESD
Detected
12h
13h
14h
100BASE-X
RCV Error
Counter
Receive Error Counter[15:0]
0000h
0000h
0200h
100BASE-X
False Carrier
Counter
RMII/SMII Overrun/Underrun Counter[7:0]
False Carrier Sense Counter[7:0]
100BASE-X RMII/SMII
Disconnect
Counter
RMII/SMII
Slowrxd
Reserved
Fastrxd
15h
16h
17h
18h
Reserved
Reserved
PTest
Reserved
Reserved
Reserved
0300h
0000h
0000h
003xh
Auxiliary
Control/
Status
Jabber
Disable
Force Link
Reserved
TXDAC
HSQ
LSQ
Edge Rate[1:0]
Auto-neg Force 100
SP100
FDX
Power
Mode
Enable
Indication Indication Indication
Indication
19h
Auxiliary
Status
Summary
Auto-neg
Complete
Auto-neg
Complete
Ack
Auto-neg
Ack Detect
Auto-neg
Ability
Detect
Auto-neg
Pause
Auto-neg
HCD
Auto-neg
Pardet
Fault
LP
Remote
Fault
LP
Page
Rcvd
LP
SP100
Link
Status
Internal
Full-duplex 0000h
Auto-neg Indication
Able
Auto-neg Indication
Enabled
Table 17: MII Register Map Summary (Cont.)
Addr Name
15
14
13
Reserved
12
11
10
9
8
7
6
5
4
3
2
1
0
Init
1Ah
Interrupt
FDX LED INTR Enable
Enable
FDX Mask SPD Mask Link Mask
INTR
Mask
Reserved
Global
Interrupt
Status
FDX
Change
SPD
Change
Link
Change
INTR
Status
0F0xh
1Bh
Auxiliary
Mode2
Reserved
10BASE-T
Dribble
Jumbo
Packet
Enable
Jumbo
Packet
FIFO
Reserved
Reserved
Block
Traffic
Activity
LED
Serial
LED
Enable
(PHY 2
of 8)
SQE
Activity/
Link LED
Enable
Qual
Parallel
Detect
Mode
Reserved 008Ah
10BASE-T Meter LED
Disable
Correct
Echo
Mode
Mode
Force On
Enable
1Ch
1Dh
10BASE-T
Auxiliary
Error
and General
Status
Reserved
MDIX
Status
MDIX
Manual
Swap
HP Auto- Manchstr
MDIX
Disable
EOF
Err
(BASE-T)
0
0
1
Reserved
Auto-neg Force 100
Enable
Indicator
SP100
Indicator
FDX
Indicator
002xh
Code
Err
(BASE-T)
Indicator
Auxiliary
Mode
Reserved
Reserved
Restart
Activity
LED
Link
LED
Force
Inactive
Reserved
Block
TXEN
Mode
Reserved x000h
Force
Inactive
1Eh
1Fh
Auxiliary
Multi-PHY
HCD
HC
T4
HCD
TX
HCD
HCD
Reserved
Auto-neg
Reserved
ACK
Detect
Ability
Detect
Super
Isolate
Reserved
RXER
Code
Mode
0000h
000Bh
TX FDX
10BASE-T 10BASE-T
FDX
Auto-neg Complete
Broadcom
Test
Reserved
Shadow
Register
Enable
Reserved
Table 18: MII Shadow Register Map Summary (MII Register 1Fh, bit7 = 1)
Addr
Name
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Init
18h
1Ah
Reserved
Reserved
003Ah
3000h
Auxiliary
Mode 4
(PHY 1)
Reserved
Reserved
Reserved
MII LED
Select
Enable
Parallel LED3
Select[1:0]
Parallel LED2 Select[2:0]
Serial Bank 5 Select[2:0]
Serial Bank 2 Select[2:0]
Parallel LED1 Select[2:0]
Serial Bank 4 Select[2:0]
Serial Bank 1 Select[2:0]
APD Wake-Up Timer[3:0]
1Ah
1Ah
1Bh
1Ch
Auxiliary
Mode 4
(PHY 2)
Serial Bank 6 Select[2:0]
Serial Bank 3 Select[2:0]
3000h
3000h
0001h
0000h
Auxiliary
Mode 4
(PHY 3)
Auxiliary
Status 2
MLT3
Detect
Cable Length 100x[2:0]
ADC Peak Amplitude[5:0]
APD
Enable
APD
Sleep
Timer
Auxiliary
Status 3
FLP
Detect
NLP
Detect
Link
Link
Fail Timer
Expire
Noise[7:0] (Root Mean Square error)
Break
Timer
Expire
FIFO Consumption[3:0]
FIFO Size Select[3:0]
1Dh
1Eh
Auxiliary
Mode 3
Reserved
0004h
0000h
Auxiliary
Status4
Packet Length Counter[15:0]
Data Sheet
BCM5228
7/12/04
MII CONTROL REGISTER
Table 19: MII Control Register (Address 00d, 00h)
Bit
Name
R/W
Description
Default
15
Soft Reset
R/W
(SC)
1 = PHY reset
0 = Normal operation
0
14
13
12
Loopback
R/W
R/W
R/W
1 = loopback mode
0 = Normal operation
0
1
1
Forced Speed Selection
Auto-Negotiation Enable
1 = 100 Mbps
0 = 10 Mbps
1 = Auto-negotiation enable
0 = Auto-negotiation disable
11
10
Power Down
Isolate
RO
0 = Normal operation
0
0
R/W
1 = Electrically isolate PHY from RMII
0 = Normal operation
9
8
Restart Auto-Negotiation
Duplex Mode
R/W
(SC)
1 = Restart auto-negotiation process
0 = Normal operation
0
0
R/W
1 = Full-duplex
0 = Half-duplex
Reserveda
Reserveda
7
–
–
–
–
0
0
6:0
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Soft Reset. To reset the BCM5228 by software control, a 1 must be written to bit 15 of the Control register using an MII write
operation. The bit clears itself after the reset process is complete, and need not be cleared using a second MII write. Writes
to other Control register bits have no effect until the reset process is completed, which requires approximately 1
microsecond. Writing a 0 to this bit has no effect. Since this bit is self-clearing, after a few cycles from a write operation, it
returns a 0 when read.
Loopback. The BCM5228 can be placed into loopback mode by writing a 1 to bit 14 of the Control register. The loopback
mode can be cleared by writing a 0 to bit 14 of the Control register, or by resetting the chip. When this bit is read, it returns
a 1 when the chip is in software-controlled loopback mode, otherwise it returns a 0.
Forced Speed Selection. If auto-negotiation is enabled, this bit has no effect on the speed selection. However, if auto-
negotiation is disabled by software control, the operating speed of the BCM5228 can be forced by writing the appropriate
value to bit 13 of the Control register. Writing a 1 to this bit forces 100BASE-X operation, while writing a 0 forces 10BASE-
T operation. When this bit is read, it returns the value of the software-controlled forced speed selection only. In order to read
the overall state of forced speed selection, including both hardware and software control, use bit 2of the Auxiliary Error and
General Status register, 1Ch.
Auto-Negotiation Enable. Auto-negotiation can be disabled by one of two methods: hardware or software control. If the
ANEN input pin is driven to a logic 0, auto-negotiation is disabled by hardware control. If bit 12 of the Control register is
written with a value of 0, auto-negotiation is disabled by software control. When auto-negotiation is disabled in this manner,
writing a 1 to the same bit of the Control register or resetting the chip re-enables auto-negotiation. Writing to this bit has no
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MII Management Interface: Register Programming
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BCM5228
Data Sheet
7/12/04
effect when auto-negotiation has been disabled by hardware control. When read, this bit returns the value most recently
written to this location, or 1 if it has not been written since the last chip reset.
Power Down. The BCM5228 does not implement power-down mode. However, the device does support auto power-down
mode (see “Auto Power-Down Mode” on page 26).
Isolate. Each individual PHY can be isolated from its Media Independent Interface by writing a 1 to bit 10 of the Control
register. All RMII outputs is tri-stated and all RMII/SMII/S3MII inputs are ignored. Because the MII/SMII/S3MII management
interface is still active, the isolate mode can be cleared by writing a 0 to bit 10 of the Control register, or by resetting the chip.
When this bit is read, it returns a 1 when the chip is in isolate mode, otherwise, it returns a 0. See also “Isolate
Mode” on page 26.
Restart Auto-Negotiation. Bit 9 of the Control register is a self-clearing bit that allows the auto-negotiation process
to be restarted, regardless of the current status of the auto-negotiation state machine. In order for this bit to have
an effect, auto-negotiation must be enabled. Writing a 1 to this bit restarts the auto-negotiation, while writing a 0 to
this bit has no effect. Since the bit is self-clearing after only a few cycles, it always returns a 0 when read. The
operation of this bit is identical to bit 9 of the Auxiliary Multiple PHY register.
Duplex Mode. By default, the BCM5228 powers up in half-duplex mode. The chip can be forced into full-duplex mode by
writing a 1 to bit 8 of the Control register while auto-negotiation is disabled. Half-duplex mode can be resumed by writing a
0 to bit 8 of the Control register, or by resetting the chip.
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MII Management Interface: Register Programming
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
MII STATUS REGISTER
Table 20: MII Status Register (Address 01d, 01h)
Bit
Name
R/W
Description
Default
15
100BASE-T4 Capability
RO
0 = Not 100BASE-T4 capable
1 = 100BASE-TX full-duplex capable
1 = 100BASE-TX half-duplex capable
1 = 10BASE-T full-duplex capable
1 = 10BASE-T half-duplex capable
–
0
14
100BASE-TX FDX Capability RO
1
13
100BASE-TX Capability
10BASE-T FDX Capability
10BASE-T Capability
RO
RO
RO
–
1
12
1
11
1
Reserveda
10:7
0000
6
5
4
3
2
1
0
MF Preamble Suppression
R/W
1 = Preamble may be suppressed
0 = Preamble always required
0
0
0
1
0
0
1
Auto-Negotiation Complete
Remote Fault
RO
1 = Auto-negotiation process completed
0 = Auto-negotiation process not completed
RO
LH
1 = Far-End Fault condition detected
0 = No Far-End Fault condition detected
Auto-Negotiation Capability
Link Status
RO
1 = Auto-negotiation capable
0 = Not auto-negotiation capable
RO
LL
1 = Link is up (Link Pass state)
0 = Link is down (Link Fail state)
Jabber Detect
RO
LH
1 = Jabber condition detected
0 = No Jabber condition detected
Extended Capability
RO
1 = Extended register capable
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
100BASE-T4 Capability. The BCM5228 is not capable of 100BASE-T4 operation, and returns a 0 when bit 15 of the status
register is read.
100BASE-X Full-Duplex Capability. The BCM5228 is capable of 100BASE-X full-duplex operation, and returns a 1 when
bit 14 of the Status register is read.
100BASE-X Half-Duplex Capability. The BCM5228 is capable of 100BASE-X half-duplex operation, and returns a 1 when
bit 13 of the Status register is read.
10BASE-T Full-Duplex Capability. The BCM5228 is capable of 10BASE-T full-duplex operation, and returns a 1 when bit
12 of the Status register is read.
10BASE-T Half-Duplex Capability. The BCM5228 is capable of 10BASE-T half-duplex operation, and returns a 1 when bit
11 of the Status register is read.
MF Preamble Suppression. This bit is the only writable bit in the Status register. Setting this bit to a 1 allows subsequent
MII management frames to be accepted with or without the standard preamble pattern. When preamble suppression is
enabled, only two preamble bits are required between successive management commands, instead of the normal 32.
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MII Status Register
Page 41
BCM5228
Data Sheet
7/12/04
Auto-Negotiation Complete. Bit 5 of the Status register returns a 1 if the auto-negotiation process has been completed and
the contents of registers 4, 5 and 6 are valid.
Remote Fault. The PHY returns a 1 in bit 4 of the Status register when its link partner has signalled a far-end fault condition.
When a far-end fault occurs, the bit is latched at 1 and remains so until the register is read and the remote fault condition
has been cleared. This only applies to the FX mode of operation.
Auto-Negotiation Capability. The BCM5228 is capable of performing IEEE auto-negotiation, and returns a 1 when bit 4 of
the Status register is read, regardless of whether or not the auto-negotiation function has been disabled.
Link Status. The BCM5228 returns a 1 on bit 2 of the Status register when the link state machine is in Link Pass, indicating
that a valid link has been established. Otherwise, it returns 0. When a link failure occurs after the Link Pass state has been
entered, the Link Status bit is latched at 0 and remains so until the bit is read. After the bit is read, it becomes 1 if the Link
Pass state has been entered again.
Jabber Detect. 10BASE-T operation only. The BCM5228 returns a 1 on bit 1 of the Status register if a jabber condition has
been detected. After the bit is read, or if the chip is reset, it reverts to 0.
Extended Capability. The BCM5228 supports extended capability registers, and returns a 1 when bit 0 of the Status register
is read. Several extended registers have been implemented in the BCM5228, and their bit functions are defined later in this
section.
PHY IDENTIFIER REGISTERS
Table 21: PHY Identifier Registers (Addresses 02d and 03d, 02h and 03h)
Bit
Name
R/W
Description
Value
15:0
15:0
MII Address 00010
MII Address 00011
RO
RO
PHYID high
PHYID low
0040h
XXXXh
Broadcom Corporation has been issued an Organizationally Unique Identifier (OUI) by the IEEE. It is a 24-bit number,
00-10-18, expressed as hex values (the two most significant bits (OUI[23:22]) of the OUI are not represented). That number,
along with the Broadcom Model Number for the BCM5228 part, 1Ch, and Broadcom Revision number, 00h, is placed into
two MII registers. The translation from OUI, Model Number and Revision Number to PHY Identifier register occurs as follows:
PHYID High[15:0] = OUI[21:6]
PHYID Low[15:0] = OUI[5:0] + Model[5:0] + Rev[3:0]
Figure 21 on page 42 shows the result of concatenating these values to form the MII Identifier registers PHYID HIGH and
PHYID LOW.
Broadcom Corporation
Page 42
PHY Identifier Registers
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
AUTO-NEGOTIATION ADVERTISEMENT REGISTER
Table 22: Auto-Negotiation Advertisement Register (Address 04d, 04h)
Bit
Name
R/W
Description
Default
15
Next Page
R/W
1 = Next page ability is enabled
0
0 = Next page ability is disabled
–
Reserveda
14
–
0
13
Remote Fault
R/W
RO
1 = Transmit remote fault
Ignore when read
0
12:11
10
Reserved Technologies
Pause
00
0
R/W
R/W
1 = Pause operation for full-duplex
1 = Advertise T4 capability
0 = Do not advertise T4 capability
9
Advertise 100BASE-T4
0
8
Advertise 100BASE-X FDX
R/W
1 = Advertise 100BASE-X full-duplex
0 = Do not advertise 100BASE-X full-duplex
1
7
6
Advertise 100BASE-X
R/W
R/W
1 = Advertise 100BASE-X
1
1
Advertise 10BASE-T FDX
1 = Advertise 10BASE-T full-duplex
0 = Do not advertise 10BASE-T full-duplex
5
Advertise 10BASE-T
R/W
R/W
1 = Advertise 10BASE-T
Indicates 802.3
1
4:0
Advertise Selector Field
00001
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Next Page. The BCM5228 supports the Next Page function.
Remote Fault. Writing a 1 to bit 13 of the Advertisement register causes a remote fault indicator to be sent to the link partner
during auto-negotiation. Writing a 0 to this bit or resetting the chip clears the Remote Fault transmission bit. This bit returns
the value last written to it, or else 0, if no write has been completed since the last chip reset.
Reserved Technologies. Ignore output when read.
Pause. Pause operation for full-duplex links. The use of this bit is independent of the negotiated data rate, medium, or link
technology. The setting of this bit indicates the availability of additional DTE capability when full-duplex operation is in use.
This bit is used by one MAC to communicate pause capability to its link partner and has no effect on PHY operation.
Advertise. Bits 9:5 of the Advertisement register allow the user to customize the ability information transmitted to the link
partner. The default value for each bit reflects the abilities of the BCM5228. By writing a 1 to any of the bits, the corresponding
ability is transmitted to the link partner. Writing a 0 to any bit causes the corresponding ability to be suppressed from
transmission. Resetting the chip restores the default bit values. Reading the register returns the values last written to the
corresponding bits, or else the default values if no write has been completed since the last chip reset.
Advertise Selector Field. Bits 4:0 of the Advertisement register contain the value 00001, indicating that the chip belongs
to the 802.3 class of PHY transceivers.
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Auto-Negotiation Advertisement Register
Page 43
BCM5228
Data Sheet
7/12/04
AUTO-NEGOTIATION LINK PARTNER (LP) ABILITY REGISTER
Table 23: Auto-Negotiation Link Partner Ability Register (Address 05d, 05h)
Bit
Name
R/W
Description
Default
15
14
13
12:11
10
9
LP Next Page
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Link partner next page bit
0
LP Acknowledge
Link partner acknowledge bit
0
LP Remote Fault
Link partner remote fault indicator
Ignore when read
0
Reserved Technologies
LP Advertise Pause
000
Link partner has pause capability
Link partner has 100BASE-T4 capability
Link partner has 100BASE-X FDX capability
Link partner has 100BASE-X capability
Link partner has 10BASE-T FDX capability
Link partner has 10BASE-T capability
Link partner selector field
0
LP Advertise 100BASE-T4
LP Advertise 100BASE-X FDX
LP Advertise 100BASE-X
LP Advertise 10BASE-T FDX
LP Advertise 10BASE-T
Link Partner Selector Field
0
8
0
7
0
6
0
5
0
4:0
00000
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
The values contained in the Auto-Negotiation Link Partner Ability register are only guaranteed to be valid after auto-
negotiation has successfully completed, as indicated by bit 5 of the MII Status register.
LP Next Page. Bit 15 of the Link Partner Ability register returns a value of 1 when the link partner implements the Next Page
function and has Next Page information that it wants to transmit. The BCM5228 does not implement the Next Page function,
and thus ignores the Next Page bit, except to copy it to this register.
LP Acknowledge. Bit 14 of the Link Partner Ability register is used by auto-negotiation to indicate that a device has
successfully received its link partner’s link code word.
LP Remote Fault. Bit 13 of the Link Partner Ability register returns a value of 1 when the link partner signals that a remote
fault has occurred. The BCM5228 simply copies the value to this register and does not act upon it.
Reserved Technologies. Ignore when read.
LP Advertise Pause. Indicates that the Link Partner Pause bit is set.
LP Advertise. Bits 9:5 of the Link Partner Ability register reflect the abilities of the link partner. A 1 on any of these bits
indicates that the Link Partner is capable of performing the corresponding mode of operation. Bits 9:5 are cleared any time
auto-negotiation is restarted or the BCM5228 is reset.
Link Partner Selector Field. Bits 4:0 of the Link Partner Ability register reflect the value of the link partner’s selector field.
These bits are cleared any time auto-negotiation is restarted or the chip is reset.
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Auto-Negotiation Link Partner (LP) Ability Register
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
AUTO-NEGOTIATION EXPANSION REGISTER
Table 24: Auto-Negotiation Expansion Register (Address 06d, 06h)
R/W Description
Bit
Name
Default
Reserveda
–
15:5
–
000h
RO
LH
1 = Parallel detection fault.
0 = No parallel detection fault
4
Parallel Detection Fault
0
1 = Link partner has next page capability
0 = Link partner does not have next page
3
2
1
Link Partner Next Page Able
Next Page Able
RO
RO
RO
0
1
0
1 = Next page able
1 = New page has been received
0 = New page has not been received
Page Received
RO
LH
1 = Link partner has auto-negotiation capability
0 = Link partner does not have auto-negotiation
0
Link Partner Auto-Negotiation Able
0
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Parallel Detection Fault. Bit 4 of the Auto-Negotiation Expansion register is a read-only bit that gets latched high when a
parallel detection fault occurs in the auto-negotiation state machine. For further details, consult the IEEE standard. The bit
is reset to 0 after the register is read or when the chip is reset.
Link Partner Next Page Able. Bit 3 of the Auto-Negotiation Expansion register returns a 1 when the link partner has Next
Page capabilities. It has the same value as bit 15 of the Link Partner Ability register.
Next Page Able. The BCM5228 Returns 1 when bit 2 of the auto-negotiation Expansion register is read indicating that it has
Next Page capabilities.
Page Received. Bit 1 of the Auto-Negotiation Expansion register is latched high when a new link code word is received from
the link partner, checked, and acknowledged. It remains high until the register is read, or until the chip is reset.
Link Partner Auto-Negotiation Able. Bit 0 of the Auto-Negotiation Expansion register returns a 1 when the link partner is
known to have auto-negotiation capability. Before any auto-negotiation information is exchanged, or if the link partner does
not comply with IEEE auto-negotiation, the bit returns a value of 0.
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Auto-Negotiation Expansion Register
Page 45
BCM5228
Data Sheet
7/12/04
AUTO-NEGOTIATION NEXT PAGE REGISTER
Table 25: Next Page Transmit Register (Address 07d, 07h)
R/W Description
Bit
15
14
13
Name
Default
1 = Additional next page(s) follows
0 = Last page
Next Page
R/W
–
0
0
1
Reserveda
–
1 = Message page
0 = Unformatted page
Message Page
R/W
R/W
1 = Complies with message
0 = Cannot comply with message
12
11
Acknowledge 2
Toggle
0
0
1
1 = Previous value of the transmitted link code word
equalled logic zero
0 = Previous value of the transmitted link code word
equalled logic one
RO
10:
0
Message/Unformatted Code
Field
R/W
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Next Page. Indicates whether this is the last Next Page to be transmitted.
Message Page. Differentiates a Message Page from an unformatted page.
Acknowledge 2. Indicates that a device has the ability to comply with the message.
Toggle. Used by the arbitration function to ensure synchronization with the link partner during Next Page exchange.
Message Code Field. An 11-bit wide field, encoding 2048 possible messages.
Unformatted Code Field. An 11-bit wide field, which can contain an arbitrary value.
Broadcom Corporation
Page 46
Auto-Negotiation Next Page Register
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
AUTO-NEGOTIATION LINK PARTNER (LP) NEXT PAGE TRANSMIT
REGISTER
Table 26: Next Page Transmit Register (Address 08d, 08h)
Bit
15
14
13
Name
R/W
Description
Default
1 = Additional next page(s) follows
0 = Last page
Next Page
RO
–
0
0
0
Reserveda
–
1= Message page
0 = Unformatted page
Message Page
RO
RO
1 = Complies with message
0 = Cannot comply with message
12
Acknowledge 2
Toggle
0
1 = Previous value of the transmitted link code word
equalled logic zero
0 = Previous value of the transmitted link code word
11
RO
0
0
equalled logic one
10:0
Message/Unformatted Code Field RO
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Next Page. Indicates whether this is the last Next Page.
Message Page. Differentiates a Message Page from an unformatted page.
Acknowledge 2. Indicates that link partner has the ability to comply with the message.
Toggle. Used by the arbitration function to ensure synchronization with the link partner during Next Page exchange.
Message Code Field. An 11-bit wide field, encoding 2048 possible messages.
Unformatted Code Field. An 11-bit wide field, which can contain an arbitrary value.
Broadcom Corporation
Document 5228-DS09-405-R
Auto-Negotiation Link Partner (LP) Next Page Transmit Register
Page 47
BCM5228
Data Sheet
7/12/04
100BASE-X AUXILIARY CONTROL REGISTER
Table 27: 100-BASE-X Auxiliary Control Register (Address 16d, 10h)
R/W Description
Bit
Name
Default
Reserveda
Transmit Disable
–
15:14
–
0
1 = Transmitter disabled in PHY
0 = Normal operation
13
R/W
–
0
0
Reserveda
12:11
–
1 = Transmit and receive 5B codes over RMII
10
Bypass 4B5B Encoder/Decoder
R/W
pins
0 = Normal RMII
0
1 = Scrambler and descrambler disabled
0 = Scrambler and descrambler enabled
9
8
7
6
Bypass Scrambler/Descrambler
Bypass NRZI Encoder/Decoder
Bypass Receive Symbol Alignment
R/W
R/W
R/W
0
0
0
0
1 = NRZI encoder and decoder is disabled
0 = NRZI encoder and decoder is enabled
1 = 5B receive symbols not aligned
0 = Receive symbols aligned to 5B boundaries
1 = Baseline wander correction disabled
0 = Baseline wander correction enabled
Baseline Wander Correction Disable R/W
1 = Far-end fault enabled
0 = Far-end fault disabled
5
FEF Enable
R/W
–
0
0
Reserveda
4:3
–
1 = Extended FIFO mode
0 = Normal FIFO mode
2
Extended FIFO Enable
R/W
0
Reserveda
1:0
–
–
00
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Transmit Disable. The transmitter can be disabled by writing a 1 to bit 13 of MII register 10h. The transmitter output (TD±)
is forced into a high impedance state.
Bypass 4B5B Encoder/Decoder. The 4B5B encoder and decoder can be bypassed by writing a 1 to bit 10 of MII register
10h. The transmitter sends 5B codes from the TXER and TXD1,TXD0 pins directly to the scrambler. TXEN must be active,
and frame encapsulation (insertion of J/K and T/R codes) is not performed. The receiver places descrambled and aligned
5B codes onto the RXER, RXD1 and RXD0 pins. CRS is asserted when a valid frame is received.
Bypass Scrambler/Descrambler. The stream cipher function can be disabled by writing a 1 to bit 9 of MII register 10h. The
Stream Cipher function can be re-enabled by writing a 0 to this bit.
Bypass NRZI Encoder/Decoder. The NRZI encoder and decoder can be bypassed by writing a 1 to bit 8 of MII register
10h, causing 3-level NRZI data to be transmitted and received on the cable. Normal operation (3-level NRZI encoding and
decoding) can be re-enabled by writing a 0 to this bit.
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100BASE-X Auxiliary Control Register
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Bypass Receive Symbol Alignment. Receive symbol alignment can be bypassed by writing a 1 to bit 7 of MII register 10h.
When used in conjunction with the bypass 4B5B encoder/decoder bit, unaligned 5B codes are placed directly on the RXER
and RXD1, RXD0 pins.
Baseline Wander Correction Disable. The baseline wander correction circuit can be disabled by writing a 1 to bit 6 of MII
register 10h. The BCM5228 corrects for baseline wander on the receive data signal when this bit is cleared.
FEF Enable. Controls the far-end fault mechanism associated with 100BASE-FX operation. A 1 enables the FEF
function, and a 0 disables it.
Extended FIFO Enable. Controls the extended receive FIFO mechanism. This bit may have to be set if the Jumbo
Packet Enable bit is set. See Table 4 on page 27 for details.
100BASE-X AUXILIARY STATUS REGISTER
Table 28: 100BASE-X Auxiliary Status Register (Address 17d, 11h)
Bit
Name
R/W
Description
Default
Reserveda
–
15:12
–
0
R/SMII Overrun/Underrun
Detected
1 = Error detected
0 = No error
11
RO
0
1 = 100BASE-FX mode
0 = 100BASE-TX or 10BASE-T mode
10
9
FX Mode
Locked
RO
RO
PIN
0
1 = Descrambler locked
0 = Descrambler unlocked
Current 100BASE-X
Link Status
1 = Link pass
0 = Link fail
8
RO
0
1 = Remote fault detected
0 = No remote fault detected
7
6
5
Remote Fault
RO
–
0
0
0
Reserveda
–
RO
LH
1 = False carrier detected since last read
0 = No false carrier since last read
False Carrier Detected
RO
LH
1 = ESD error detected since last read
0 = No ESD error since last read
4
3
2
1
0
Bad ESD Detected
0
0
0
0
0
RO
LH
1 = Receive error detected since last read
0 = No receive error since last read
Receive Error Detected
Transmit Error Detected
Lock Error Detected
RO
LH
1 = Transmit error code received since last read
0 = No transmit error code received since last read
RO
LH
1 = Lock error detected since last read
0 = No lock error since last read
RO
LH
1 = MLT3 code error detected since last read
0 = No MLT3 code error since last read
MLT3 Code Error Detected
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
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100BASE-X Auxiliary Status Register
Page 49
BCM5228
Data Sheet
7/12/04
R/SMII Overrun/Underrun Detected. The PHY returns a 1 in bit 11, when the RMII receive FIFO encounters an overrun
or underrun condition.
FX Mode. Returns a value derived from the SD± input pins. Returns a 1 when SD± are driven with a valid differential
signal level. Returns a 0 when both SD+ and SD– are simultaneously driven low.
Locked. The PHY returns a 1 in bit 9 when the descrambler is locked to the incoming data stream. Otherwise, it returns a 0.
Current 100BASE-X Link Status. The PHY returns a 1 in bit 8 when the 100BASE-X link status is good. Otherwise, it
returns a 0.
Remote Fault. The PHY returns a 1 while its link partner is signalling a far-end fault condition. Otherwise, it returns a 0.
False Carrier Detected. The PHY returns a 1 in bit 5 of the Extended Status register if a false carrier has been detected
since the last time this register was read. Otherwise, it returns a 0.
Bad ESD Detected. The PHY returns a 1 in bit 4 if an end-of-stream delimiter error has been detected since the last time
this register was read. Otherwise, it returns a 0.
Receive Error Detected. The PHY returns a 1 in bit 3 if a packet was received with an invalid code since the last time this
register was read. Otherwise, it returns a 0.
Transmit Error Detected. The PHY returns a 1 in bit 2 if a packet was received with a Transmit Error code since the last
time this register was read. Otherwise, it returns a 0.
Lock Error Detected. The PHY returns a 1 in bit 1 if the descrambler has lost lock since the last time this register was read.
Otherwise, it returns a 0.
MLT3 Code Error Detected. The PHY returns a 1 in bit 0 if an MLT3 coding error has been detected in the receive data
stream since the last time this register was read. Otherwise it returns a 0.
100BASE-X RECEIVE ERROR COUNTER
Table 29: 100BASE-X Receive Error Counter (Address 18d, 12h)
Bit
Name
R/W
Description
Default
Number of non-collision packets with receive errors
since last read
15:0
Receive Error Counter [15:0] R/W
0000h
Receive Error Counter [15:0]. This counter increments each time the BCM5228 receives a non-collision packet containing
at least one receive error. The counter automatically clears itself when read. When the counter reaches its maximum value,
FFh, it stops counting receive errors until cleared
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100BASE-X Receive Error Counter
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
100BASE-X FALSE CARRIER SENSE COUNTER
Table 30: 100BASE-X False Carrier Sense Counter (Address 19d, 13h)
Bit
Name
R/W
Description
Default
RMII/SMII Overrun/Underrun
Counter [7:0]
15:8
R/W
Number of RMII overruns/underruns since last read
00h
False Carrier Sense Counter
[7:0]
7:0
R/W
Number of false carrier sense events since last read
00h
RMII/SMII Overrun/Underrun Counter [7:0]. The RMII/SMII Overrun/Underrun Counter increments each time the
BCM5228 detects an overrun or underrun of the RMII/SMII FIFOs. The counter automatically clears itself when read. When
the counter reaches its maximum value, FFh, it stops counting overrun/underrun errors until cleared.
False Carrier Sense Counter [7:0]. This counter increments each time the BCM5228 detects a false carrier on the receive
input. This counter automatically clears itself when read. When the counter reaches its maximum value (FFh), it stops
counting false carrier sense errors until it is cleared.
100BASE-X DISCONNECT COUNTER
Table 31: 100BASE-X Disconnect Counter
Bit
Name
R/W
Description
Default
1 = In extended FIFO mode, detect fast receive data
15
RMII/SMII Fast RXD
R/O
0
0 = Normal
0 = Normal
14
RMII/SMII Slow RXD
R/O
0
1 = In extended FIFO mode, detect slow receive data
Reserveda
Reserveda
–
–
13:8
7:0
–
–
000010
00h
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
RMII/SMII Fast RXD. Extended FIFO operation only. Bit 15 of the Disconnect Counter register indicates the FIFO state
machine has detected fast receive data relative to the REF_CLK input.
RMII/SMII Slow RXD. Extended FIFO operation only. Bit 14 of the Disconnect Counter register indicates the FIFO state
machine has detected slow receive data relative to the REF_CLK input.
Broadcom Corporation
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100BASE-X False Carrier Sense Counter
Page 51
BCM5228
Data Sheet
7/12/04
AUXILIARY CONTROL/STATUS REGISTER
Table 32: Auxiliary Control/Status Register (Address 24d, 18h)
Bit
Name
R/W
R/W
Description
1= Jabber function disabled in PHY
Default
15
Jabber Disable
0
0 = Jabber function enabled in PHY
14
Link Disable
R/W
1= Link Integrity test disabled in PHY
0 = Link Integrity test is enabled in PHY
0
Reserveda
HSQ:LSQ
13:8
7:6
–
–
000000
00
R/W
These two bits define the squelch mode of the
10BASE-T carrier sense mechanism:
00 = Normal squelch
01 = Low squelch
10 = High squelch
11 = Not allowed
5:4
Edge Rate [1:0]
R/W
00 = 1 ns
01 = 2 ns
10 = 3 ns
11 = 4 ns
11
3
2
1
0
Auto-Negotiation Indicator
Force 100/10 Indication
Speed Indication
RO
RO
RO
RO
1 = Auto-negotiation activated
0 = Speed forced manually
1
1
0
0
1 = Speed forced to 100BASE-X
0 = Speed forced to 10BASE-T
1 = 100BASE-X
0 = 10BASE-T
Full-Duplex Indication
1 = Full-duplex active
0 = Full-duplex not active
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Jabber Disable. 10BASE-T operation only. Bit 15 of the Auxiliary Control register allows the user to disable the jabber detect
function, defined in the IEEE standard. This function shuts off the transmitter when a transmission request has exceeded a
maximum time limit. By writing a 1 to bit 15 of the Auxiliary Control register, the jabber detect function is disabled. Writing a
0 to this bit or resetting the chip restores normal operation. Reading this bit returns the value of Jabber Detect Disable.
Link Disable. Writing a 1 to bit 14 of the Auxiliary Control register allows the user to disable the link integrity state machines,
and place the BCM5228 into forced link pass status. Writing a 0 to this bit or resetting the chip restores the link integrity
functions. Reading this bit returns the value of Link Integrity Disable.
HSQ:LSQ. Extend or decrease the squelch levels for detection of incoming 10BASE-T data packets. The default squelch
levels implemented are those defined in the IEEE standard. The high-squelch and low-squelch levels are useful for situations
where the IEEE-prescribed levels are inadequate. The squelch levels are used by the CRS/LINK block to filter out noise and
recognize only valid packet preambles and link integrity pulses. Extending the squelch levels allows the BCM5228 to operate
properly over longer cable lengths. Decreasing the squelch levels can be useful in situations where there is a high level of
noise present on the cables. Reading these 2 bits returns the value of the squelch levels.
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Auxiliary Control/Status Register
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Edge Rate [1:0]. Control bits used to program the transmit DAC output edge rate in 100BASE-TX mode. These bits are
logically ANDed with the ER [1:0] input pins to produce the internal edge-rate controls (Edge_Rate [1] AND ER [1],
Edge_Rate [0] AND ER [0]).
Auto-Negotiation Indicator. A read-only bit that indicates whether auto-negotiation has been enabled or disabled on the
BCM5228. A combination of a 1 in bit 12 of the Control register and a logic 1 on the ANEN input pin is required to enable
auto-negotiation. When auto-negotiation is disabled, bit 3 of the Auxiliary Control register returns a 0. At all other times, it
returns a 1.
Force100/10 Indication. A read-only bit that returns a value of 0 when one of following two cases is true:
•
•
The ANEN pin is low AND the F100 pin is low, or
Bit 12 of the Control register has been written 0 AND bit 13 of the Control register has been written 0.
When bit 8 of the Auxiliary Control register is 0, the speed of the chip is 10BASE-T. In all other cases, either the speed is
not forced (auto-negotiation is enabled), or the speed is forced to 100BASE-X.
Speed Indication. Bit 1 of the Auxiliary Control register is a read-only bit that shows the true current operation speed of the
BCM5228. A 1 bit indicates 100BASE-X operation, while a 0 indicates 10BASE-T. While the auto-negotiation exchange is
performed, the BCM5228 is always operating at 10BASE-T speed
Full-Duplex Indication. Bit 0 of the Auxiliary Control register is a read-only bit that returns a 1 when the BCM5228 is in full-
duplex mode. In all other modes, it returns a 0.
Broadcom Corporation
Document 5228-DS09-405-R
Auxiliary Control/Status Register
Page 53
BCM5228
Data Sheet
7/12/04
AUXILIARY STATUS SUMMARY REGISTER
This register contains copies of redundant status bits found elsewhere within the MII register space.
Table 33: Auxiliary Status Summary Register (Address 25d, 19h)
Bit
Name
R/W
Description
Default
15
14
Auto-Negotiation Complete
RO
1 = Auto-negotiation process completed
0
0
Auto-Negotiation Complete
Acknowledge
RO
LH
1 = Auto-negotiation completed acknowledge state
13
12
Auto-Negotiation
Acknowledge Detected
RO
LH
1 = Auto-negotiation acknowledge detected
1 = Auto-negotiation for link partner ability
BCM5228 and link partner pause operation bit set
0
0
Auto-Negotiation Ability
Detect
RO
LH
11
Auto-Negotiation Pause
Auto-Negotiation HCD
RO
RO
0
10:8
000 = No highest common denominator
001 = 10BASE-T
000
010 = 10BASE-T full-duplex
011 = 100BASE-TX
100 = 100BASE-T4
101 = 100BASE-TX full-duplex
11x = Undefined
7
6
5
4
3
2
Auto-Negotiation Parallel
Detection Fault
RO
LH
1 = Parallel detection fault
0
0
0
0
0
0
Link Partner Remote Fault
RO
1 = Link partner has signalled a far-end fault
condition in
FX mode
Link Partner Page Received
RO
LH
1 = New page has been received
Link Partner Auto-
Negotiation Able
RO
1 = Link partner is auto-negotiation capable
Speed Indicator
RO
1 = 100 Mbps
0 = 10 Mbps
Link Status
RO
LL
1 = Link is up (link pass state)
1
0
Auto-Negotiation Enabled
Full-Duplex Indication
RO
1 = Auto-negotiation enabled
1 = Full-duplex active
1
0
RO
LL
0 = Full-duplex not active
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
Descriptions for each of these individual bits can be found associated with their primary register descriptions.
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Auxiliary Status Summary Register
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
INTERRUPT REGISTER
Table 34: Interrupt Register (Address 26d, 1Ah)
BIt
Name
R/W
Description
Default
15
14
13:12
11
10
9
FDX LED Enable
INTR Enable
R/W
R/W
–
FDX LED enable in serial LED stream
Interrupt enable
0
0
Reserveda
FDX Mask
SPD Mask
LINK Mask
INTR Mask
–
00
1
R/W
R/W
R/W
R/W
–
Full-duplex interrupt mask
SPEED interrupt mask
LINK interrupt mask
Master interrupt mask
–
1
1
8
1
Reserveda
7:5
000
Global Interrupt
Indicator
1= Indicates an interrupt is present within the
BCM5228
4
RO
0
3
2
1
0
FDX Change
SPD Change
LINK Change
INTR Status
RO, LH
RO, LH
RO, LH
RO, LH
Duplex change interrupt
Speed change interrupt
Link change interrupt
Interrupt status
0
0
0
0
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
FDX LED Enable. Setting this bit enables the FDX LED status to output serial LED data in serial LED mode. See
Table 6 on page 29 for details.
INTR Enable. Setting this bit enables Interrupt mode. The state of this bit also affects which status signals are shifted out
on the serial LED data in Serial LED mode. See Table 6 on page 29 for details.
FDX Mask. When this bit is set, changes in duplex mode do not generate an interrupt.
SPD Mask. When this bit is set, changes in operating speed do not generate an interrupt.
LINK Mask. When this bit is set, changes in link status do not generate an interrupt.
INTR Mask. Master interrupt mask. When this bit is set, no interrupts are generated regardless of the state of the other mask
bits.
Global Interrupt Indicator. A 1 indicates an Interrupt is present within the BCM5228.
FDX Change. A 1 indicates a change of duplex status since last register read. A register read clears the bit.
SPD Change. A 1 indicates a change of speed status since last register read. A register read clears the bit.
LINK Change. A 1 indicates a change of link status since last register read. A register read clears the bit.
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Interrupt Register
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BCM5228
Data Sheet
7/12/04
INTR Status. Represents status of the INTR# pin. A 1 indicates that the interrupt mask is off and that one or more of the
change bits are set. A register read clears the bit.
AUXILIARY MODE 2 REGISTER
Table 35: Auxiliary Mode 2 Register (Address 27d, 1Bh)
BIt
Name
R/W
–
Description
Default
Reserveda
15:12
11
–
0
0
10BASE-T Dribble Bit
Correct
R/W
1 = Enable
0 = Disable
1 = Enable
0 = Disable
1 = Enable
0 = Disable
–
10
9
Jumbo Packet Enable
R/W
R/W
0
0
Jumbo Packet FIFO Enable
Reserveda
8
7
–
0
1
Block 10BASE-T Echo
Mode
R/W
1 = Enable
0 = Disable
1 = Enable
0 = Disable
1 = On
6
5
Traffic Meter LED Mode
R/W
R/W
0
0
Activity LED Force On
0 = Normal operation
–
Reserveda
4
3
2
–
1
1
0
Reserveda
–
–
Activity/Link LED Mode
R/W
1 = Enable
0 = Disable
1 = Enable
0 = Disable
–
1
0
Qual Parallel Detect Mode
Reserveda
R/W
1
–
0
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
10BASE-T Dribble Bit Correct. When enabled, the PHY rounds-down to the nearest nibble when dribble bits are present
on the 10BASE-T input stream.
Jumbo Packet Enable. When enabled, the 100BASE-X unlock timer changes to allow long packets. See
Table 5 on page 27 for details.
Jumbo Packet FIFO Enable. When enabled, the RMII/SMII/S3MII receive FIFO doubles from 7 nibbles to 14 nibbles. The
Jumbo Packet FIFO Enable bit should be set to a 1 when jumbo packet mode is enabled. See Table 4 on page 27 and
Table 5 on page 27 for details.
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Auxiliary Mode 2 Register
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Block 10BASE-T Echo Mode. When enabled, during 10BASE-T half-duplex transmit operation, the TXEN signal does not
echo onto the RXDV pin. The TXEN echoes onto the CRS pin, and the CRS deassertion directly follows the TXEN
deassertion.
Traffic Meter LED Mode. When enabled, the Activity LEDs (ACTLED# and FDXLED# if full-duplex LED and interrupt LED
modes are not enabled) do not blink based on the internal LED clock (approximately 80 µs of time). Instead, they blink based
on the rate of receive and transmit activity. Each time a receive or transmit operation occurs, the LED turns on for a minimum
of 5 µs. During light traffic, the LED blinks at a low rate, while during heavier traffic the LEDs remain on.
Activity LED Force On. When set to 1, the Col LED, Transmit LED, Receive LED, and Activity LED are turned on. This bit
has a higher priority than the Activity LED Force Inactive, bit 4, register 1Dh.
Activity/Link LED Mode. When enabled, the receive output goes active upon acquiring link and pulses during receive or
transmit activity.
Qual Parallel Detect Mode. This bit allows the auto-negotiation/parallel detection process to be qualified with information
in the Advertisement register.
If this bit is not set, the local BCM5228 device is enabled to auto-negotiate, and the far-end device is a 10BASE-T or
100BASE-X non auto-negotiating legacy type, the local device auto-negotiates/parallel-detects the far-end device,
regardless of the contents of its Advertisement register (04h).
If this bit is set, the local device compares the link speed detected to the contents of its Advertisement register. If the
particular link speed is enabled in the Advertisement register, the local device asserts link. If the link speed is disabled in this
register, then the local device does not assert link and continues monitoring for a matching capability link speed.
10BASE-T AUXILIARY ERROR AND GENERAL STATUS REGISTER
Table 36: 10BASE-T Auxiliary Error and General Status Register (Address 28d, 1Ch)
Bit
Name
R/W
–
Description
Default
Reserveda
15:14
13
–
0
0
MDIX Status
RO
0 = MDI is in use
1 = MDIX is in use
12
11
MDIX Manual Swap
R/W
R/W
0 = MDI or MDIX if MDIX is not disabled
1 = Force MDIX
0
0
HP Auto-MDIX Disable
0 = Enable HP auto-MDIX
1 = Disable HP auto-MDIX
10
9
Manchester Code Error
End-of-Frame Error
RO
RO
–
1 = Manchester code error (10BASE-T)
0
0
0
1 = EOF detection error (10BASE-T)
–
Reserveda
Reserveda
Reserveda
8
7:5
4
–
–
–
–
001
0
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
Broadcom Corporation
Document 5228-DS09-405-R
10BASE-T Auxiliary Error and General Status Register
Page 57
BCM5228
Data Sheet
7/12/04
Table 36: 10BASE-T Auxiliary Error and General Status Register (Address 28d, 1Ch)
3
2
1
0
Auto-Negotiation Indication
Force 100/10 Indication
Speed Indication
RO
RO
RO
RO
1 = Auto-negotiation activated
0 = Speed forced manually
1
1
0
0
1 = Speed forced to 100BASE-X
0 = Speed forced to 10BASE-T
1 = 100BASE-X
0 = 10BASE-T
Full-Duplex Indication
1 = Full-duplex active
0 = Full-duplex not active
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
All Error bits in the Auxiliary Error and General Status register are read-only and are latched high. When certain types of
errors occur in the BCM5228, one or more corresponding error bits become 1. They remain so until the register is read, or
until a chip reset occurs. All such errors necessarily result in data errors, and are indicated by a high value on the RXER
output pin at the time the error occurs.
MDIX Status. This bit, when read as a 1, indicates that the MDI TD± and RD± signals for the BCM5228 have been
swapped. The cause for this is one of the following:
•
•
the MDIX Swap bit was manually set to a 1, or
the HP Auto-MDIX function is enabled and the BCM5228 has detected an MDI cross-over cable.
MDIX Manual Swap. When this bit is set to a 1, the MDI TD± and RD± signals for the BCM5228 are forced into being
swapped.
HP Auto-MDIX Disable. When this bit is set to a 1, the HP Auto-MDIX function is disabled in the BCM5228.
Manchester Code Error. Indicates that a Manchester code violation was received. This bit is only valid during 10BASE-T
operation.
End-of-Frame Error. Indicates that the end-of-frame (EOF) sequence was improperly received, or not received at all. This
error bit is only valid during 10BASE-T operation.
Auto-Negotiation Indication. A read-only bit that indicates whether auto-negotiation has been enabled or disabled on the
BCM5228. A combination of a 1 in bit 12 of the Control register and a logic 1 on the ANEN input pin is required to enable
auto-negotiation. When auto-negotiation is disabled, bit 15 of the Auxiliary Mode register returns a 0. At all other times, it
returns a 1.
Force 100/10 Indication. A read-only bit that returns a value of 0 when one of following two cases is true:
•
•
The ANEN pin is low AND the F100 pin is low, or
Bit 12 of the Control register has been written 0 AND bit 13 of the Control register has been written 0.
When bit 2 of the Auxiliary Control register is 0, the speed of the chip is 10BASE-T. In all other cases, either the speed is
not forced (auto-negotiation is enabled), or the speed is forced to 100BASE-X.
Speed Indication. A read-only bit that shows the true current operation speed of the BCM5228. A 1 bit indicates 100BASE-
X operation, while a 0 indicates 10BASE-T. While the auto-negotiation exchange is performed, the BCM5228 is always
operating at 10BASE-T speed.
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Data Sheet
BCM5228
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Full-Duplex Indication. A read-only bit that returns a 1 when the BCM5228 is in full-duplex mode. In all other modes, it
returns a 0.
Broadcom Corporation
Document 5228-DS09-405-R
10BASE-T Auxiliary Error and General Status Register
Page 59
BCM5228
Data Sheet
7/12/04
AUXILIARY MODE REGISTER
Table 37: Auxiliary Mode Register (Address 29d, 1Dh)
Bit
Name
R/W
Description
Default
Reserveda
–
15:5
–
000h
1 = Disable Col LED, Transmit LED,
Receive
LED, and Activity LED
0 = Enable above LEDs
4
Activity LED Force Inactive
R/W
0
1 = Disable link LED output
0 = Enable link LED output
3
2
1
0
Link LED Disable
R/W
–
0
0
0
0
Reserveda
–
1 = Enable block TXEN mode
0 = Disable block TXEN mode
Block TXEN Mode
R/W
–
Reserveda
–
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a Read/Modify Write.
Activity LED Force Inactive. When set to 1, disables the Col LED, Transmit LED, Receive LED, and Activity LED. This bit
has a lower priority than the Activity LED Force On, bit 5 of register 1Bh.
Link LED Disable. When set to 1, disables the Link LED output pin. When 0, Link LED output is enabled.
Block TXEN Mode. When this mode is enabled, short IPGs of 1, 2, 3, or 4 TXC cycles all result in the insertion of two idles
before the beginning of the next packet’s JK symbols.
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Data Sheet
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AUXILIARY MULTIPLE PHY REGISTER
Table 38: Auxiliary Multiple PHY Register (Address 30d, 1Eh)
Bit
Name
R/W
RO
Description
1 = Auto-negotiation result is 100BASE-TX full-duplex
Default
15
HCD_TX_FDX
HCD_T4
0
14
RO
RO
RO
RO
–
1 = Auto-negotiation result is 100BASE-T4
1 = Auto-negotiation result is 100BASE-TX
1 = Auto-negotiation result is 10BASE-T full-duplex
1 = Auto-negotiation result is 10BASE-T
–
0
13
HCD_TX
0
12
HCD_10BASE-T_FDX
HCD_10BASE-T
0
11
0
Reserveda
10:9
00
8
Restart Auto-Negotiation
R/W
(SC)
1 = Restart auto-negotiation process
0 = No effect
0
7
Auto-Negotiation Complete
RO
1 = Auto-negotiation process completed
0 = Auto-negotiation process not completed
0
6
5
4
3
Acknowledge Complete
Acknowledge Detected
Ability Detect
RO
RO
RO
R/W
1 = Auto-negotiation acknowledge completed
1 = Auto-negotiation acknowledge detected
1 = Auto-negotiation waiting for LP ability
0
0
0
0
Super Isolate
1 = Super isolate mode
0 = Normal operation
Reserveda
2
1
–
–
0
0
10BASE-T Serial Mode
R/W
1 = Enable 10BASE-T serial mode
0 = Disable 10BASE-T serial mode
Reserveda
0
–
–
0
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
HCD. Bits 15:11 of the Auxiliary Multiple PHY register are 5 read-only bits that report the highest common denominator
(HCD) result of the auto-negotiation process. Immediately upon entering the Link Pass state after each reset or restart auto-
negotiation, only 1 of these 5 bits is 1. The Link Pass state is identified by a 1 in bit 6 or 7 of this register. The HCD bits are
reset to 0 every time auto-negotiation is restarted or the BCM5228 is reset.
For their intended application, these bits uniquely identify the HCD only after the first link pass after reset or restart of auto-
negotiation. If the ability of the link partner is different on later link fault and subsequent renegotiations, more than one of the
above bits may be active.
Restart Auto-Negotiation. A self-clearing bit that allows the auto-negotiation process to be restarted, regardless of
the current status of the state machine. For this bit to work, auto-negotiation must be enabled. Writing a 1 to this
bit restarts auto-negotiation. Because the bit is self-clearing, it always returns a 0 when read. The operation of this
bit is identical to bit 9 of the Control register.
Auto-Negotiation Complete. This read-only bit returns a 1 after the auto-negotiation process has been completed. It
remains 1 until the auto-negotiation process is restarted, a link fault occurs, or the chip is reset. If auto-negotiation is disabled
or the process is still in progress, the bit returns a 0.
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Acknowledge Complete. This read-only bit returns a 1 after the acknowledgment exchange portion of the auto-negotiation
process has been completed and the arbitrator state machine has exited the acknowledge complete state. It remains this
value until the auto-negotiation process is restarted, a link fault occurs, auto-negotiation is disabled, or the BCM5228 is reset.
Acknowledge Detected. This read-only bit is set to 1 when the arbitrator state machine exits the acknowledge detect state.
It remains high until the auto-negotiation process is restarted, or the BCM5228 is reset.
Ability Detect. This read-only bit returns a 1 when the auto-negotiation state machine is in the ability detect state. It enters
this state a specified time period after the auto-negotiation process begins, and exits after the first FLP burst or link pulses
are detected from the link partner. This bit returns a 00 any time the auto-negotiation state machine is not in the ability detect
state.
Super Isolate. Writing a 1 to this bit places the BCM5228 into the super isolate mode. Similar to the isolate mode, all RMII/
SMII/S3MII inputs are ignored, and all RMII/SMII/S3MII outputs are tri-stated. Additionally, all link pulses are suppressed.
This allows the BCM5228 to coexist with another PHY on the same adapter card, with only one being activated at any time.
See also “Super Isolate Mode” on page 26.
10BASE-T Serial Mode. Writing a 1 to bit 1 of the Auxiliary Mode register enables the 10BASE-T Serial mode. In
10BASE-T Serial mode, data packets traverse to the MAC layer across only TXD0 and RXD0 at a rate of 10 MHz. Serial
operation is not available in 100BASE-X mode.
BROADCOM TEST REGISTER
Table 39: Broadcom Test (Address 31d, 1Fh)
BIt
Name
R/W
Description
Default
Reserveda
–
15:8
–
00h
1 = Enable shadow registers 1Ah-1Eh
0 = Disable shadow registers
7
Shadow Register Enable
R/W
0
Reserveda
Reserveda
Reserveda
–
–
–
6
–
–
–
0
5
0
4:0
0Bh
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Shadow Register Enable. Writing a 1 to bit 7 of register 1Fh allows R/W access to the shadow registers.
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Data Sheet
BCM5228
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AUXILIARY MODE 4 (PHY 1) REGISTER (SHADOW REGISTER)
Table 40: Auxiliary Mode 4 (PHY 1) Register (Shadow Register 26d, 1Ah)
BIt
Name
R/W
Description
Default
Reserveda
–
15:9
–
0011 000b
0
1 = Enable LED output selection through MII
register
8
MII LED Select Enable
R/W
Configuration bits for LED3 output. For details, see
“LED Modes” on page 29.
TXER/LED1[7:6]b
TXER/LED1[5:3]
TXER/LED1[2:0]
7:6
5:3
2:0
Parallel LED3 Select[1:0]
Parallel LED2 Select[2:0]
Parallel LED1 Select[2:0]
R/W
R/W
R/W
Configuration bits for LED2 output. For details, see
“LED Modes” on page 29.
Configuration bits for LED1 output. For details, see
“LED Modes” on page 29.
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation. MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
b. Status of TXER/LED1[7:0] during power-on reset determines the default values for parallel LED3, LED2 and LED1 selects.
MII LED Select Enable. Enables configuration of LED functions through MII register writes when this bit is set to a 1.
Otherwise, power-on reset configurations are in effect.
Parallel LED3 Select[1:0]. Bit 7 and 6 select LED output for the parallel LED3 pin if MII LED select enable is set to a 1.
Parallel LED2 Select[2:0]. Bit 5 and 3 select LED output for the parallel LED2 pin if MII LED select enable is set to a 1.
Parallel LED1 Select[2:0]. Bit 2 and 0 select LED output for the parallel LED1 pin if MII LED select enable is set to a 1.
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AUXILIARY MODE 4 (PHY 2) REGISTER (SHADOW REGISTER)
Table 41: Auxiliary Mode 4 (PHY 2) Register (Shadow Register 26d, 1Ah)
BIt
Name
R/W
Description
Default
Reserveda
–
0011
000b
15:9
–
Configuration bits for bank 6 output in low-cost
serial LED mode. For details, see “LED
Modes” on page 29.
8:6
5:3
2:0
Serial Bank 6 Select[2:0]
Serial Bank 5 Select[2:0]
Serial Bank 4 Select[2:0]
R/W
R/W
R/W
000
000
000
Configuration bits for bank 5 output in low-cost
serial LED mode. For details, see “LED
Modes” on page 29.
Configuration bits for bank 4 output in low-cost
serial LED mode. For details, see “LED
Modes” on page 29.
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation. MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Serial Bank 6 Select[2:0]. If low-cost serial LED mode is selected, these bits configure bank 6 LED output on the serial LED
data stream SLED_DO.
Serial Bank 5 Select[2:0]. If low-cost serial LED mode is selected, these bits configure bank 5 LED output on the serial LED
data stream SLED_DO.
Serial Bank 4 Select [2:0]. If low-cost serial LED mode is selected, these bits configure bank 4 LED output on the serial
LED data stream SLED_DO.
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AUXILIARY MODE 4 (PHY 3) REGISTER (SHADOW REGISTER)
Table 42: Auxiliary Mode 4 (PHY 3) Register (Shadow Register 26d, 1Ah)
BIt
Name
R/W
Description
Default
–
0011
000b
Reserveda
15:9
–
Configuration bits for bank 3 output in low-cost
serial LED mode. For details, see “LED
Modes” on page 29.
8:6
5:3
2:0
Serial Bank 3 Select[2:0]
Serial Bank 2 Select[2:0]
Serial Bank 1 Select[2:0]
R/W
R/W
R/W
000
000
000
Configuration bits for bank 2 output in low-cost
serial LED mode. For details, see “LED
Modes” on page 29.
Configuration bits for bank 1 output in low-cost
serial LED mode. For details, see “LED
Modes” on page 29.
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation. MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Serial Bank 3 Select[2:0]. If low-cost serial LED mode is selected, these bits configure bank 6 LED output on serial LED
data stream SLED_DO.
Serial Bank 2 Select[2:0]. If low-cost serial LED mode is selected, these bits configure bank 5 LED output on serial LED
data stream SLED_DO.
Serial Bank 1 Select[2:0]. If low-cost serial LED mode is selected, these bits configure bank 4 LED output on serial LED
data stream SLED_DO.
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AUXILIARY STATUS 2 REGISTER (SHADOW REGISTER)
Table 43: Auxiliary Status 2 Register (Shadow Register 27d, 1Bh)
BIt
Name
R/W
Description
Default
15
MLT3 Detected
R/O
1 = MLT3 detected
0
The BCM5228 shows the cable length in 20-meter
increments, as shown in Table 44.
14:12
11:6
Cable Length 100X[2:0]
ADC Peak Amplitude[5:0]
R/O
R/O
000
00h
A to D peak amplitude seen
0 = Normal mode
5
APD Enable
R/W
0
1 = Enable auto power-down mode
0 = 2.5-second sleep before wake up
1= 5.0-second sleep before wake up
Duration of wake up
4
APD Sleep Timer
R/W
R/W
0
3:0
APD Wake-Up Timer[3:0]
0001
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation. MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1.
MLT3 Detected. The BCM5228 returns a 1 in this bit whenever MLT3 signaling is detected.
Cable Length 100X [2:0]. The BCM5228 provides the cable length for each port when a 100TX link is established.
Table 44: Cable Length
Cable Length 100x [2:0]
Cable Length in Meters
000
001
010
011
100
101
110
111
< 20
20 to <40
40 to <60
60 to < 80
80 to < 100
100 to < 120
120 to < 140
> 140
ADC Peak Amplitude [5:0]. The BCM5228 returns the A to D converter’s 6-bit peak amplitude seen during this link.
APD Enable. When in normal mode, if this bit is set to a 1, the BCM5228 enters auto power-down mode. If this bit is set and
the link is lost, the BCM5228 enters low power-down mode. When energy is detected, the device enters full power mode.
Otherwise, it wakes up after either 2.5 seconds or 5.0 seconds, as determined by the APD Sleep Timer bit. When the
BCM5228 wakes up, it sends link pulses and also monitors energy. If the link partner’s energy is detected, the BCM5228
device continues to stay in wake-up mode for a duration determined by the APD wake-up timer before going to low power
mode.
APD Sleep Timer. This bit determines how long the BCM5228 stays in low power mode before waking up. If this bit is a 0,
the BCM5228 device waits approximately 2.5 seconds before waking up. Otherwise, it wakes up after approximately 5.0
seconds.
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APD Wake-Up Timer[3:0]. This counter determines how long the BCM5228 stays in wake-up mode before going to low
power mode. This value is specified in 40-millisecond increments from 0 to 600 milliseconds. A value of 0 forces the
BCM5228 to stay in low power mode indefinitely. In this case, the BCM5228 requires a hard reset to return to normal mode.
AUXILIARY STATUS 3 REGISTER (SHADOW REGISTER)
Table 45: Auxiliary Status 3 Register (Shadow Register 28d, 1Ch)
BIt
Name
R/W
Description
Default
15:8
7:4
Noise [7:0]
R/O
–
Current mean square error value, valid only if link is established 00h
Reserveda
–
000h
0000
3:0
FIFO Consumption [3:0]
R/O
Currently used number of nibbles in the receive FIFO
Note: MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
Noise[7:0]. The BCM5228 provides the current mean squared error value for noise when a valid link is established.
FIFO Consumption[3:0]. The BCM5228 indicates the number of nibbles of FIFO currently used.
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AUXILIARY MODE 3 REGISTER (SHADOW REGISTER)
Table 46: Auxiliary Mode 3 Register (Shadow Register 29d, 1Dh)
BIt
15:9
8
Name
R/W
Description
Default
Reserveda
Reserveda
Reserveda
Reserveda
–
–
0
–
–
0
7
–
–
0
6
–
–
0
Reserveda
5:4
3:0
–
–
0h
4h
FIFO Size Select [3:0]
R/W
Currently-selected receive FIFO size
Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear
after read operation. MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1.
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
FIFO Size Select[3:0]. The BCM5228 indicates the current selection of receive FIFO size using bit 3 through 0, as shown
in Table 47. The size can also be determined by the Extended FIFO Enable bit (register 10h, bit 2) and the Jumbo Packet
FIFO Enable bit (register 1Bh, bit 9) for backward compatibility with the 0.35-micron products.
Table 47: Current Receive FIFO Size
Receive Fifo size in Use
FIFO Size Select[3:0]
(# of bits)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
12
16
20
24
28
32
36
40
44
48
52
56
60
64
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AUXILIARY STATUS 4 REGISTER (SHADOW REGISTER)
Table 48: Auxiliary Status 4 Register (Shadow Register 30d, 1Eh)
BIt
Name
R/W
Description
Default
15:0
Packet Length Counter[15:0]
R/O
Number of bytes in the last received packet
0000h
Packet Length Counter[15:0]. The BCM5228 shows the number bytes in the last packet received. This is valid only when
a valid link is established.
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Section 7: Timing and AC Characteristics
All digital output timing is specified at CL = 30 pF.
Output rise/fall times are measured between 10% and 90% of the output signal swing. Input rise/fall times are measured
between VIL maximum and VIH minimum. Output signal transitions are referenced to the midpoint of the output signal swing.
Input signal transitions are referenced to the midpoint between VIL maximum and VIH minimum.
Table 49: Clock Timing
Parameter
Symbol
Min
Typ
Max
Unit
REF_CLK cycle time (50-MHz operation)
REF_CLK cycle time (125-MHz operation)
CK_CYCLE
CK_CYCLE
–
–
20
8
–
–
ns
ns
CK_HI
CK_LO
REF_CLK high/low time (50-MHz operation)
REF_CLK high/low time (125-MHz operation)
7
–
10
4
13
–
ns
ns
CK_HI
CK_LO
REF_CLK rise/fall time (50-MHz operation)
REF_CLK rise/fall time (125-MHz operation)
CK_EDGE
CK_EDGE
–
–
–
–
2
1
ns
ns
Table 50: Reset Timing
Parameter
Symbol
Min
Typ
Max
Unit
Reset pulse length with stable REF_CLK input
Activity after end of reset
RESET_LEN
RESET_WAIT
RESET_EDGE
2
–
–
–
–
µs
µs
ns
100
–
–
RESET rise/fall time
10
CK_EDGE
CK_EDGE
REF_CLK
CK_LO
CK_HI
Normal PHY
activity can
begin here
CK_CYCLE
RESET_EDGE
RESET_WAIT
RESET#
RESET_LEN
RESET_EDGE
Figure 5: Clock and Reset Timing
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Table 51: RMII Transmit Timing
Parameter
Symbol
Min Typ
Max Unit
REF_CLK cycle time
REF_CLK
–
4
2
–
–
20
–
–
–
–
–
–
ns
ns
ns
ns
ns
TXEN, TX_ER, TXD[1:0] setup time to REF_CLK rising
TXEN, TX_ER, TXD[1:0] hold time from REF_CLK rising
TD after TXEN assert
TXEN_SETUP
TXEN_HOLD
TXEN_TDATA
TXD_TDATA
–
89
95
TXD to TD steady state delay
Note: TXD[1:0] shall provide valid data for each REF_CLK period while TX_EN is asserted. As the REF_CLK frequency
is 10 times the data rate in 10MB/s mode, the value on TXD[1:0] shall be valid such that TXD[1:0] can be sampled every
10th cycle, regardless of the starting cycle within the group and yield the correct frame data.
REF_CLK
TX_EN
TXD[1]
TXD[0]
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
0
0
Preamble
SFD
Data
Figure 6: RMII Transmit Packet Timing
Table 52: RMII Receive Timing
Parameter
Symbol
Min
Typ
Max
Unit
REF_CLK cycle time
REF_CLK
–
2
–
–
–
20
–
ns
ns
ns
ns
ns
RXD[1:0], CRS, DV, RX_ER output delay from REF_CLK rising
CRS_DV assert after RD±
–
16
–
RX_CRS_DV
RX_CRS_DV
124
164
237
CRS_DV deassert after RD±
–
CRS_DV deassert after RD±, valid EOP
RX_CRS_DV_EOP
–
Note: As the REF_CLK frequency is 10 times the data rate in 10 Mbps mode, the value on RXD[1:0] is valid such that
RXD[1:0] can be sampled every 10th cycle, regardless of the starting cycle within the group and yield the correct frame
data. The receiver accounts for differences between the local REF_CLK and the recovered clock through use of
sufficient elasticity buffering. The output delay has a load of 25 pf, which accommodates a PCB trace length of over 12
inches.
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Data Sheet
7/12/04
REF_CLK
CRS_DV
RXD[1]
RXD[0]
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
0
0
/J/
/K/
Preamble
SFD
Data
Figure 7: RMII Receive Packet Timing
REF_CLK
CRS_DV
RXD[1]
RXD[0]
0
0
0
0
0
0
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
False Carrier Detected
Figure 8: RMII Receive Packet with False Carrier
Table 53: SMII/S3MII Timing
Parameter
Symbol
Min
Typ
Max
Unit
STX (TXD) setup (SCLK rising)
STX (TXD) hold (SCLK rising)
SYNC (SSYNC) setup (SCLK rising)
SYNC (SSYNC) hold (SCLK rising)
SRX (RXD) delay (SCLK rising)
SMII_RSYNC delay
STX_SETUP
STX_HOLD
1.5
1.0
1.5
1.0
2.0
2.0
–
–
–
–
–
–
–
ns
ns
ns
ns
ns
ns
–
SYNC_SETUP
SYNC_HOLD
SRX_DELAY
SYNC_DELAY
–
–
5.0
5.0
Note: SCLK is REF_CLK in SMII mode
SCLK is SMII_TXC for S3MII STX
SCLK is SMII_RXC for S3MII SRX
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BCM5228
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SYNC_SETUP
SYNC_HOLD
SYNC
SYNC_DELAY
SCLK
STX_SETUP
STX_HOLD
STX
TXD3
TXD5
TXD7
RXD7
TX_ER
TXD2
TXD4
TXD6
RXD6
TX_EN TXD0 TXD1
SRX
RXD1 RXD2 RXD3
CRS RX_DV RXD0
SRX_DELAY
RXD4 RXD5
Figure 9: SMII/S3MII Timing
Table 54: Auto-Negotiation Timing
Parameter
Symbol
Min
Typ
Max
Unit
Link test pulse width
–
–
–
–
–
100
16
–
ns
ms
µs
µs
FLP burst interval
5.7
111
55.5
22.3
139
69.5
Clock pulse to clock pulse
Clock pulse to data pulse (data = 1)
123
62.5
Table 55: LED Timing
Parameter
Symbol
Min
Typ
Max
Unit
LED on time (ACTLED)
LED off time (ACTLED)
–
–
–
–
80
80
–
–
ms
ms
Table 56: MII Management Data Interface Timing
Parameter
Symbol
Min
Typ
Max
Unit
MDC cycle time
–
–
–
–
–
–
40
20
–
–
–
–
–
–
–
–
ns
ns
ns
ns
ns
ns
MDC high/low
–
MDC rise/fall time
10
–
MDIO input setup time to MDC rising
MDIO input hold time from MDC rising
MDIO output delay from MDC rising
10
10
0
–
30
Broadcom Corporation
Document 5228-DS09-405-R
Timing and AC Characteristics
Page 73
BCM5228
Data Sheet
7/12/04
MDC_CYCLE
MDIO_SETUP
MDC_RISE
MDC
MDC_FALL
MDIO_HOLD
MDIO_SETUP
MDIO_HOLD
MDIO (Into BCM5228)
MDIO_DELAY
MDIO (From BCM5228)
Figure 10: Management Interface Timing
MDC
SKIP
Hi-Z (PHY Pull-UP)
SKIP
MDIO
D0
T
D1
IDLE
S
Start of MDC/MDIO Cycle
End of MDC/MDIO Cycle
Skip 2 MDC Clocks between MDC/MDIO Cycles With Preamble Suppressed
RMII Register 1, Bit 6 set to 1
Figure 11: Management Interface Timing (with Preamble Suppression On)
Broadcom Corporation
Page 74
Timing and AC Characteristics
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Broadcom Corporation
Document 5228-DS09-405-R
Timing and AC Characteristics
Page 75
BCM5228
Data Sheet
7/12/04
Section 8: Electrical Characteristics
Table 57: Absolute Maximum Ratings
Symbol
VDD
VI
Parameter
Min
Max
Units
V
Supply voltage
Input voltage
GND − 0.3
GND − 0.3
2.75
OVDD + 0.3
±10
V
II
Input current
mA
°C
V
–
TSTG
VESD
Storage temperature
Electrostatic discharge
−40
+125
1000
–
Note: These specifications indicate levels where permanent damage to the device can occur. Functional operation is
not guaranteed under these conditions. Operation at absolute maximum conditions for extended periods can adversely
affect long-term reliability of the device.
Table 58: Recommended Operating Conditions
Operating
Symbol Parameter
Pins
Min
Max
Units
Mode
VDD
VDD
VIH
Supply voltage
OVDD
2.375
2.375
2.0
3.465
2.625
V
V
V
–
–
Supply voltage
AVDD, DVDD, PLLVDDC, BIASVDD
All digital inputs
High-level
input voltage
–
VIL
Low-level
input voltage
All digital inputs
SD± {1:8}
–
0.8
0.4
–
V
100BASE-FX
100BASE-FX
V
VIDIFF
VICM
Differential
input voltage
SD± {1:8}
150
mV
Common mode input
voltage
RD± {1:8}
100BASE-TX
100BASE-FX
–
1.85
1.60
0
2.05
1.80
70
V
RD± {1:8}, SD± {1:8}
–
V
TA
Ambient operating
temperature
°C
Table 59: Electrical Characteristics
Symbol Parameter
Pins
Conditions
Min
Typ
Max
Units
AVDD, DVDD
OVDD
100BASE-TX
100BASE-TX
–
–
839
59
–
892
76
–
mA
mA
Total supply
IDD
current
IOH = −12 mA,
OVDD = 3.3 V
Digital outputs
Digital outputs
TD± {1:8}
OVDD − 0.5
V
V
V
High-level
VOH
IOH = −12 mA,
OVDD = 2.5 V
–
–
–
OVDD − 0.4
output voltage
Driving loaded
magnetics module
–
VDD +
1.5
Broadcom Corporation
Page 76
Electrical Characteristics
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Table 59: Electrical Characteristics (Cont.)
Symbol Parameter
Pins
Conditions
Min
Typ
–
Max
Units
IOL = 8 mA
–
All digital outputs
0.4
–
V
Low-level
VOL
Driving loaded
magnetics module
–
output voltage
TD± {1:8}
TD± {1:8}
DVDD − 1.5
V
Differential
VODIFF
100BASE-FX
mode
–
–
400
mV
output voltage
VI = OVDD
VI = DGND
VI = OVDD
VI = DGND
–
–
–
–
–
–
–
–
–
–
+100
-200
+200
–100
µA
µA
µA
µA
Digital inputs with
pull-up resistors
Digital inputs with
pull-down resistors
II
Input current
DGND ≤ VI ≤
OVDD
All other digital
inputs
±100
–
µA
µA
DGND ≤ VO
OVDD
≤
–
–
All three-state
outputs
High-impedance
output current
IOZ
All open-drain
outputs
–
–
–
–
VO = OVDD
–
µA
V
Vbias
Bias voltage
VREF, RDAC
1.18
1.30
Broadcom Corporation
Document 5228-DS09-405-R
Electrical Characteristics
Page 77
BCM5228
Data Sheet
7/12/04
Section 9: Mechanical Information
E
E1
D
D1
1
θ
3
A2
A
h
seating
plane
A1
θ
4
θ
Millimeter
Nom
2
Symbol
Max
Min
A
4.10
0.50
0.25
A1
A2
0.37
3.49
3.39
30.35
27.90
30.35
27.90
0.30
3.59
b
30.60
28.00
30.60
28.00
0.60
30.85
28.10
30.85
28.10
D
D1
E
E1
L
r
1
0.75
0.30
0.23
r
2
b
h
0.22
0.15
0.13
θ
e
0.50 BSC
1
c
0.08
0.20
0.30
0.102
r1
r2
e
L
c
°
°
θ
0
7
1
°
°
°
10
θ
2
2
6
10
Notes:
1. Drawings on this page are not to scale
°
θ
3
°
10
θ
4
2. All dimensions are in millimeters except where noted
3. Foot length "L" is measured at gage plane, 0.25mm above the seating plane
4. Seating plane is defined by three lowest lead tips
208-pin detail
Figure 12: 208-Pin PQFP Package
Broadcom Corporation
Page 78
Mechanical Information
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
0.15
Z
Z
0.20
Z
X
1.45P0.10
0.10
4X
0.40P0.05
17.00
A1 BALL PAD CORNER
5
Ø0.50 TYP
C0.20 M
C0.08 M
Z
X
Y
Z
SEATING PLANE
6
1.05P0.05
A1 BALL PAD CORNER
TOP VIEW
16
15
14 13
12
11
10
9
8
7
6
5
4
3
2
1
SIDE VIEW
A
B
C
D
E
F
G
H
J
K
L
M
N
6
5
PRIMARY DATUM Z AND SEATING PLANE ARE DEFINED BY
THE SPHERICAL CROWNS OF THE SOLDER BALLS.
P
R
T
DIMENSION IS MEASURED AT THE MAXIMUM SOLDER BALL DIAMETER,
PARALLEL TO PRIMARY DATUM Z.
4.
3.
2.
1.
THE MAXIMUM ALLOWABLE NUMBER OF SOLDER BALLS IS 256.
THE MAXIMUM SOLDER BALL MATRIX SIZE IS 16 X 16.
THE BASIC SOLDER BALL GRID PITCH IS 1.00.
1.00
1.00 REF
ALL DIMENSIONS AND TOLERANCES CONFORM TO ASME Y14.5M-1994.
BOTTOM VIEW
(256 SOLDER BALLS)
Figure 13: 256-Pin Fine Pitch BGA (FPBGA) Package
Broadcom Corporation
Document 5228-DS09-405-R
Mechanical Information
Page 79
BCM5228
Data Sheet
7/12/04
Section 10: Packaging Thermal Characteristics
Table 60: ThetaJA vs. Airflow for the BCM5228B (256 FPBGA) Package
Airflow (feet per minute)
ThetaJA(°C/W)
0
100
200
400
600
19.02
16.70
15.85
14.84
14.16
ThetaJC for this package is 5.84°C/W. The BCM5228B is designed and rated for a maximum junction temperature of 125°C.
Table 61: ThetaJA vs. Airflow for the BCM5228F (208 PQFP) Package
Airflow (feet per minute)
ThetaJA(°C/W)
0
100
200
400
600
16.35
13.96
13.09
12.21
11.70
ThetaJC for this package is 6.19°C/W. The BCM5228F is designed and rated for a maximum junction temperature of 125°C.
Table 62: ThetaJA vs. Airflow for the BCM5228U (208 PQFP) Package
Airflow (feet per minute)
ThetaJA(°C/W)
0
100
200
400
600
16.35
13.96
13.09
12.21
11.70
ThetaJC for this package is 6.19°C/W. The BCM5228U is designed and rated for a maximum junction temperature of 125°C.
Broadcom Corporation
Page 80
Packaging Thermal Characteristics
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Broadcom Corporation
Document 5228-DS09-405-R
Packaging Thermal Characteristics
Page 81
BCM5228
Data Sheet
7/12/04
Section 11: Application Examples
RXD0{1:8}
8
TXD0{1:8}
BCM5228
8
SCLK
16 Port
125 MHz
MAC
SSYNC
TXD0{1:8}
RXD0{1:8}
BCM5228
8
8
Figure 14: SMII Application
Broadcom Corporation
Page 82
Application Examples
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
SMII_RSYNC
RXD0 {1:8}
SMII_RXC
8
BCM5228
SMII_TXC
TXD0{1:8}
SSYNC
8
SCLK
125 MHz
16 Port
MAC
SSYNC
TXD0{1:8}
SMII_TXC
8
BCM5228
SMII_RSYNC
RXD0 {1:8}
SMII_RXC
8
Figure 15: SMII Application using Source Synchronous Signals
Broadcom Corporation
Document 5228-DS09-405-R
Application Examples
Page 83
BCM5228
Data Sheet
7/12/04
Broadcom Corporation
16215 Alton Parkway
P.O. Box 57013
Irvine, CA 92619-7013
Phone: 949-450-8700
Fax: 949-450-8710
Broadcom® Corporation reserves the right to make changes without further notice to any products or data herein to improve reliability, function, or design.
Information furnished by Broadcom Corporation is believed to be accurate and reliable. However, Broadcom Corporation
does not assume any liability arising out of the application or use of this information, nor the application or use of any product or
circuit described herein, neither does it convey any license under its patent rights nor the rights of others.
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
MAC
MAC
MAC
MAC
RMII{1}/SMII{1}
RMII{2}/SMII{2}
RMII{7}/SMII{7}
RMII{8}/SMII{8}
BCM5228
REF_CLK
50-MHz (RMII)
125-MHz (SMII)
MAGNETICS
RJ45
(1)
RJ45
(2)
RJ45
(7)
RJ45
(8)
Figure 16: Switch Application
Broadcom Corporation
Document 5228-DS09-405-R
Application Examples
Page 85
BCM5228
Data Sheet
7/12/04
Broadcom Corporation
Page 86
Application Examples
Document 5228-DS09-405-R
Data Sheet
BCM5228
7/12/04
Section 12: Ordering Information
Part Number
Package
Ambient Temperature
BCM5228UA4KPF
BCM5228FA4KPF
BCM5228BA4KPB
208 PQFP
208 PQFP
256 FBGA
0°C to 70°C (32°F to 158° F)
0°C to 70°C (32°F to 158°F)
0°C to 70°C (32° F to 158°F)
BCM5228UA4IPF
BCM5228FA4IPF
BCM5228BA4IPB
208 PQFP
208 PQFP
256 FPBGA
–40°C to 85°C (–40°F to 185°F)
–40°C to 85°C (–40°F to 185°F)
–40°C to 70°C (–40°F to 158°F)
Note: A4 is the current revision number at the time of publication of this data sheet.
The BCM5228BA4IPB can operate at –40°C to +85°C (–40°F to 185°F) if used with a heat sink (see the following for details)
or equivalent:
Manufacturer:
Part Number:
Wakefield Engineering
624-60AB, made of extruded aluminum, 21 mm × 21 mm × 15.2 mm pin-fin
Thermal Interface: Chomerics T410 double-sided thermal tape
The following thermal data applies to the BCM5228BA4IPB with the heat sink previously described.
Table 63: ThetaJA vs. Airflow for the BCM5228B with Heat Sink
Airflow (feet per minute)
ThetaJA(°C/W)
0
100
200
400
600
13.37
11.51
10.61
9.94
9.58
Broadcom Corporation
Document 5228-DS09-405-R
Ordering Information
Page 87
BCM5228
Data Sheet
7/12/04
Broadcom Corporation
Page 88
Ordering Information
Document 5228-DS09-405-R
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