TVP3026-175MHFGB_技术文档

TVP3026M

Video Interface Palette

SGLS101A

January 1999

Printed on Recycled Paper

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF

DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR

WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER

CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO

BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

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party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Contents

Section

Title

Page

1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1

1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

1.2 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

1.3 Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

1.4 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5

1.5 Terminal Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5

2

Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1

2.1 Microprocessor Unit Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1

2.1.1 8/6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

2.1.2 Pixel Read Mask Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

2.1.3 Palette Page Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

2.1.4 Cursor and Overscan Color Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4

2.2 Color Palette RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4

2.2.1 Writing to Color Palette RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5

2.2.2 Reading From Color Palette RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5

2.3 Clock Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5

2.4 PLL Clock Generators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6

2.4.1 Pixel Clock PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8

2.4.2 Memory Clock PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10

2.4.3 Loop Clock PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12

2.5 Frame-Buffer Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16

2.5.1 Frame-Buffer Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17

2.5.2 Frame-Buffer Timing Without Using SCLK . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17

2.5.3 Frame-Buffer Timing Using SCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17

2.5.4 Split Shift-Register-Transfer Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–18

2.6 Multiplexing Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19

2.6.1 Little-Endian and Big-Endian Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19

2.6.2 VGA Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19

2.6.3 Pseudo-Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–19

2.6.4 Direct-Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–20

2.6.5 True-Color Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–21

2.6.6 Packed-24 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–21

2.6.7 Multiplex Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–23

2.7 On-Chip Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–31

2.7.1 Cursor RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–31

2.7.2 Cursor Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–32

2.7.3 Three-Color 64 x 64 Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33

2.7.4 Interlaced Cursor Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–34

iii

Contents (Continued)

Section

Title

Page

2.8 Port-Select and Color-Key Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–34

2.8.1 Port-Select Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–35

2.8.2 Color-Key Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–35

2.9 Overscan Border . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–36

2.10 Horizontal Zooming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–37

2.11 Test Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–37

2.11.1 16-Bit CRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–37

2.11.2 Sense Comparator Output and Test Register . . . . . . . . . . . . . . . . . . . . . . . 2–38

2.11.3 Identification Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–38

2.11.4 Silicon Revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–38

2.12 General-Purpose I/O Registers and Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–39

2.13 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–39

2.14 Analog Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–39

2.15 Register Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2.15.1 General Control Register (Index: 0x1D, Access: R/W, Default: 0x00) . . . 2–42

2.15.2 Miscellaneous Control Register (Index: 0x1E, Access: R/W,

Default: 0x0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2.15.3 Indirect Cursor Control Register (Index: 0x06, Access: R/W,

Default: 0x00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2.15.4 Direct Cursor Control Register (Direct Register: 1001, Access: R/W,

Default: 0x00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2.15.5 Cursor Position (x, y) Registers (Direct Register: 1100–1111, Access:

R/W Default: Uninitialized) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–44

2.15.6 Color-Key Control Register (Index 0x38, Access R/W, Default 0x00) . . . 2–45

2.15.7 Color-Key (Overlay, Red, Green, Blue) Registers (Index: 0x30–0x37,

Access: R/W, Default: Uninitialized) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

2.15.8 CRC Remainder LSB and MSB Registers (Index: 0x3C–0x3D,

Access: Read Only, Default: Uninitialized) . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

2.15.9 CRC Bit Select Register (Index: 0x3E, Access: Write Only,

Default: Uninitialized) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

3

Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

3.1 Absolute Maximum Ratings Over Operating Free-Air Temperature Range . . . . 3–1

3.2 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

3.3 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2

3.4 Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3

3.5 Timing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

3.6 Switching Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5

3.7 Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5

Appendix A

Appendix B

Appendix C

Frequency Synthesis PLL Register Settings . . . . . . . . . . . . . . . . . . . . . . A–1

PLL Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1

Mechanical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C–1

iv

List of Illustrations

Figure

Title

Page

1–1 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

1–2 Terminal Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

2–1 TVP3026M Clocking Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8

2–2 Loop Clock PLL Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12

2–3 Typical Configuration – VRAM Clocked by Accelerator . . . . . . . . . . . . . . . . . . . . . . 2–16

2–4 Typical Configuration – VRAM Clocked by TVP3026M . . . . . . . . . . . . . . . . . . . . . . 2–16

2–5 Frame-Buffer Timing Without Using SCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–17

2–6 Frame-Buffer Timing Using SCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–18

2–7 Frame-Buffer Timing Using SCLK (With First SCLK Pulse Relocated) . . . . . . . . . 2–18

2–8 Cursor RAM Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–32

2–9 Cursor Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33

2–10 Overscan Border . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–37

2–11 CRC Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–38

2–12 Equivalent Circuit of the Current Output (IOG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–40

2–13 Composite Video Output (With 0 IRE, 8-Bit Output) . . . . . . . . . . . . . . . . . . . . . . . . . 2–41

2–14 Composite Video Output (With 7.5 IRE, 8-Bit Output) . . . . . . . . . . . . . . . . . . . . . . . 2–41

3–1 MPU Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6

3–2 Video Input/Output Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7

v

List of Tables

Table

Title

Page

2–1 Direct Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1

2–2 Indirect Register Map (Extended Registers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2

2–3 Allocation of Palette Page Register Bits† . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

2–4 Color Register Address Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4

2–5 Clock Selection Register Bits CSR(6–4)(Index: 0x1A, Access: R/W,

Default: 0x07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6

2–6 Clock Selection Register Bits CSR(3–0) (Index: 0x1A, Access: R/W,

Default: 0x07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6

2–7 PLL Top-Level Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7

2–8 PLL Address Register (Index: 0x2C, Access: R/W, Default: Uninitialized) . . . . . . . 2–7

2–9 PLL Data Register Pointer Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7

2–10 Pixel Clock PLL Registers† . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2–11 Pixel Clock PLL Frequency Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–9

2–12 MCLK PLL Registers† . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–10

2–13 MCLK/Loop Clock Control Register (Index: 0x39 hex, Access: R/W,

Default:0x18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–11

2–14 Loop Clock PLL Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13

2–15 Loop Clock PLL Settings for Packed-24 Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14

2–16 Latch-Control Register (Index: 0x0F, Access: R/W, Default: 0x06) . . . . . . . . . . . . 2–15

2–17 Multiplex Mode and Bus Width Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–24

2–18 Pseudo-Color Mode Pixel-Latching Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–27

2–19 Packed-24 Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–28

2–20 Direct-Color Mode Pixel-Latching Sequence (Little-Endian)

2–29

2–21 Direct-Color Mode Pixel-Latching Sequence (Big-Endian) . . . . . . . . . . . . . . . . . . . 2–30

2–22 Cursor RAM Vs. Color Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–33

2–23 Port-Select Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–35

2–24 Sense Test Register Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–38

2–25 General-Purpose I/O Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–39

2–26 General-Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2–27 Miscellaneous Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–42

2–28 Indirect Cursor-Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2–29 Direct Cursor-Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–43

2–30 Cursor Position (X, Y) Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–44

2–31 Color-Key Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–45

2–32 Color-Key Low and High Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

2–33 CRC Remainder LSB and MSB Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

2–34 CRC Bit Select Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–46

vi

1 Introduction

The TVP3026M is an advanced video interface palette (VIP) from Texas Instruments (TI ) implemented

in the EPIC 0.2-micron CMOS process. The TVP3026M is a 64-bit VIP that supports packed-24 modes

enabling 24-bit true-color and high resolution at the same time without excessive amounts of frame buffer

memory. For example, a 24-bit true color display with 1280 × 1024 resolution may be packed into 4 MB of

VRAM. A phase-locked loop (PLL)-generated, 50% duty-cycle reference clock is output in the packed-24

modes, maximizing VRAM cycle time and the screen refresh rate.

The TVP3026M supports all of the pixel formats of the TVP3020 VIP. Data can be split into 4 or 8 bit-planes

for pseudo-color mode or split into 12-, 16- or 24-bit true-color and direct-color modes. For the 24-bit direct

color modes, an 8-bit overlay plane is available. The 16-bit direct-color and true-color modes can be

configured to IBM XGA (5, 6, 5), TARGA (1, 5, 5, 5), or 16-bit/pixel (6, 6, 4) configuration as another

existing format. An additional 12-bit mode with 4-bit overlay (4, 4, 4, 4) is supported with 4 bits for each color

and overlay. All color modes support selection of little or big endian data format for the pixel bus. Additionally,

thedeviceisalsosoftwarecompatiblewiththeINMOS IMSG176/8andBrooktree Bt476/8colorpalettes.

The TVP3026M has two fully programmable phase-locked loops (PLLs) for pixel clock and memory clock

functions, as well as a simple frequency doubler for dramatic improvements in graphics system cost and

integration. A third loop clock PLL makes pixel data-latch timing much simpler than with other existing color

palettes. In addition, four software-selectable digital clock inputs (2 TTL- and 2 ECL/TTL-compatible) may

beutilized. Thevideoclockprovidesasoftwareselecteddivideratioofthechosenpixelclock. Theshiftclock

output can be used directly as the VRAM shift clock. The reference clock output, driven by the loop clock

PLL, provides a timing reference to the graphics accelerator.

Like the TVP3020, the TVP3026M integrates a complete IBM XGA-compatible hardware cursor on chip,

making significant graphics performance enhancements possible. Additionally, hardware port select and

color-keyed switching functions, give the user several efficient means of producing graphical overlays on

direct-color backgrounds.

The TVP3026M has three 256 × 8 color lookup tables with triple 8-bit video digital-to-analog converters

(DACs) capable of directly driving a doubly-terminated 75-Ω line. The lookup tables, a dual-ported RAM

architecture enables ultra-high speed operation. Sync generation is incorporated on the green output

channel. Horizontal sync (HSYNC) and vertical sync (VSYNC) are pipeline delayed through the device and

optionally inverted to indicate screen resolution to the monitor. A palette-page register can select from

multiple color maps in RAM when 4 bit-planes are used. This allows the screen colors to be changed with

only one microprocessor write cycle.

The device features a separate VGA bus, which supports the integrated VGA modes in graphics accelerator

applications, allowing efficient support for VGA graphics and text modes. The separate bus also is useful

for accepting data from the feature connector of most VGA-supported personal computers, without the need

for external data multiplexing.

The TVP3026M is highly system-integrated. It can be connected to the serial port of VRAM devices without

external buffer logic and can be connected to many graphics engines directly. It also supports the split

shift-register transfer function, which is common to many industry-standard VRAM devices.

The system-integration concept is carried even further to manufacturing test and field diagnosis. To support

these, several highly-integrated test functions have been designed to enable simplified testing of the palette

and the entire graphics system.

TI and EPIC are trademarks of Texas Instruments Incorporated.

IBM and XGA is a registered trademark of International Business Machines Corporation

TARGA is a registered trademark of Truevision Incorporated.

Brooktree is a trademark of Brooktree Corporation.

INMOS is a trademark of INMOS International Limited.

1–1

1.1 Features

The TVP3026M video interface palette features:

•

System resolutions up to 1600 × 1280 at 76-Hz refresh rate

Color depths of 4, 8, 16, 24 and 32 bit/pixel

64-bit-wide pixel bus

Versatile direct-color modes:

–

24-bit/pixel with 8-bit overlay (O, R, G, B)

24-bit/pixel (R, G, B)

16-bit/pixel (5, 6, 5) XGA configuration

16-bit/pixel (6, 6, 4) configuration

15-bit/pixel with a 1-bit overlay (1, 5, 5, 5) TARGA configuration

12-bit/pixel with a 4-bit overlay (4, 4, 4, 4)

•

True-color gamma correction

Packed pixel formats for 24 bit/pixel using a 32-or 64-bit/pixel bus

50% duty cycle reference clock for higher screen refresh rates in packed-24 modes

Programmable frequency synthesis phase-locked loops (PLLs) for dot clock and memory clock

Loop clock PLL compensates for system delay and ensures reliable data latching

Versatile pixel bus interface supports little- and big-endian data formats

135-, 175-, and 220-MHz versions

On-chip hardware cursor, 64 × 64 × 2 cursor (XGA and X-windows functionally compatible)

Direct interfacing to video RAM

Overscan for creation of custom screen borders

Color-keyed switching of direct color and true color or overlay

Hardware port select switching between direct color and true color or overlay

Triple 8-Bit D/A converters

Analog output comparators for monitor detection

RS-343A compatible outputs

Direct VGA pass-through capability

Palette page register

Horizontal zooming capability

1–2

1.2 Functional Block Diagram

REF

FS ADJUST

COMP2

COMP1

V

ref

True-

Color

24

1.235 V

32

MUX

Direct-Color

Pipeline

Delay

1:1

Pixel

2:1

24

Bus

P63 – P0

LCLK

Pipe

MUX

32

64

Latch

Color Key

Switch

8

24

Unpack

Logic

24

32

IOR

IOG

DAC

8

24

3 × 256 × 8

Color

Palette

RAM

Output

MUX

8

24

Pseudo-

Color

MUX

Read

Mask

Page

Reg

32

8

DAC

8

VGA

Latch

VGA7 – VGA0

8

1 × 24

Overscan

Color

24

IOB

3 × 24

Cursor

Colors

8

D7 – D0

RS3 – RS0

RD

2

8

5

Test Function

and

Sense Comparator

MPU

Registers

and

Control

Logic

64 × 64 × 2

Cursor RAM

and Control

DOT

Clock

Divider

Loop

Clock

PLL

Pixel

Clock

PLL

Memory

Clock

PLL

2

SENSE

HSYNCOUT

VSYNCOUT

Video-Signal

Control

WR

2

Clock Select

5

Figure 1–1. Functional Block Diagram

1–3

1.3 Terminal Assignments

PLLSEL0

1

2

3

4

5

6

7

8

XTAL2

XTAL1

GND

123

122

121

120

119

118

117

116

115

114

113

112

111

110

109

108

107

106

105

104

103

102

101

100

99

DV

DD

P33

P32

P31

P30

P29

P28

P27

P26

P25

P24

P23

P22

P21

P20

GND

DV

P57

DD

P58

P59

P60

P61

P62

P63

CLK2

CLK1

CLK0

SFLAG

VGABL

VGAVS

VGAHS

SYSBL

NC

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

DV

DD

P19

P18

NC

SYSVS

P17

P16

P15

P14

P13

P12

P11

P10

P9

SYSHS

8/6

PSEL

OVS

VGA7

VGA6

VGA5

98

97

96

95

94

VGA4

VGA3

VGA2

VGA1

VGA0

30

31

32

33

34

35

36

37

38

39

93

92

91

90

89

88

87

86

85

84

P8

P7

P6

P5

P4

P3

P2

P1

P0

AV

GND

DD

AV

DD

GND

40

41

DV

DD

83

DV

NC – No internal connection

Figure 1–2. Terminal Assignments

1–4

1.4 Ordering Information

TVP3026 – XXX – X AXXX

Pixel Clock Frequency Indicator

Must contain three characters:

–175: 175-MHz pixel clock

Military Extension M

Revision

Package

Must contain three letters:

HFG: Ceramic, Quad Flat Pack

†

1.5 Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

AV

82, 86,

88, 89

Analog power. All AV

terminals must be connected. A separate cutout in the

DD

DV

plane should be made for AV . The DV

DD DD

and AV planes should be

DD

connectedonlyatasinglepointthroughaferritebeadclosetowherepowerenters

the board.

CLK0

109

I

Dot clock 0 TTL input. CLK0 can be selected to drive the dot clock at frequencies

up to 140 MHz. When using the VGA port, the maximum frequency is 85 MHz.

CLK0 can be selected as the latch clock for VGA data and video controls.

(power-up default).

CLK1

110

I

Dot clock 1 TTL input. CLK1 can be selected to drive the dot clock at frequencies

up to 140 MHz.

CLK2, CLK2

111, 112

Dual-mode dot clock input. These inputs are ECL-compatible inputs.

Alternatively, CLK2 and CLK2 may be used as individual TTL clock inputs.

Programmingtheclockselectionregisterselectsthechosenconfiguration. These

inputs may be selected as the dot clock up to the device limit while in the ECL

mode or up to 140 MHz in the TTL mode.

COMP1,

COMP2

79, 81

I

Compensation. COMP1 and COMP2 provide compensation for the internal

reference amplifier. A 0.1-µF ceramic capacitor is required between COMP1 and

COMP2. This capacitor must be as close to the device as possible to avoid noise

pick up.

DV

2, 18, 40,

41, 46, 67,

120, 140

Digital power. All DV

terminals must be connected to the digital power plane

DD

with sufficient decoupling capacitors near the TVP3026.

D7–D0

FS ADJUST

GND

48–55

I/O MPU interface data bus. These terminals are used to transfer data in and out of

the register map, palette RAM, and cursor RAM.

78

I

Full-scale adjustment. A resistor connected between this terminal and ground

controls the full-scale range of the DACs.

17, 42, 47,

68, 71, 73,

75, 77,

Ground. All GND terminals must be connected. A common ground plane should

be used.

83–85, 87,

121, 139,

163

†

All unused inputs should be tied to a logic level and not be allowed to float.

1–5

†

1.5 Terminal Functions (Continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

HSYNCOUT,

VSYNCOUT

69,

70

O

Horizontal and vertical sync outputs. These outputs are pipeline delayed

versions of the selected sync inputs. Output polarity inversion may be

independently selected using general control register bits GCR(1,0).

IOR,

IOG,

IOB

72,

74,

76

O

Analog current outputs. These outputs can drive a 37.5-Ω load directly (doubly

terminated75-Ω line), thuseliminatingtherequirementforanyexternalbuffering.

GI/O4– I/O0

59–61,

63, 64

I/O Software programmable general I/O terminals that can be used to control

external devices.

LCLK

126

124

I

Latch clock input. LCLK is used to latch pixel-bus-input data and system video

controls. VGA data may also be latched with LCLK if so selected. LCLK may be

a delayed version of RCLK provided that linear phase changes in RCLK cause

corresponding linear phase changes in LCLK.

MCLK

O

Memory clock output. MCLK is the output of an independently programmable

PLL frequency synthesizer. The frequency range is 14 – 100 MHz. The dot clock

may be output on this terminal while the MCLK frequency is reprogrammed. See

Section 2.4.2.1.

PCLKOUT

PLLGND

148

146

Pixel clock PLL output. PCLKOUT is a buffered version of the pixel clock PLL

output and is mainly for test purposes. This output is independent of the dot clock

source selected by the clock selection register.

Ground for PLL supplies. Decoupling capacitors should be connected between

PLLV

DD

and PLLGND. PLLGND should be connected to the system ground

through a ferrite bead.

PLLV

147, 150

PLL power supply. PLLV

Decoupling capacitors should be connected between PLLV

Terminal 143 supplies power to the pixel clock PLL. Terminal 146 supplies power

to the MCLK PLL and the loop clock PLL.

must be a well regulated 5 V power supply voltage.

DD

and PLLGND.

DD

OVS

98

I

Overscan input. OVS is used to control the display of custom screen borders. If

OVS is not used, it should be connected to GND.

ODD/EVEN

125

Odd or even field display. ODD/EVEN indicates odd or even field during

interlaced display for cursor operation. Logic 0 indicates the even field and logic

1indicatestheoddfield. SeeSection2.7.4forcursoroperationininterlacemode.

PLLSEL0,

PLLSEL1

1,

164

I

Pixel clock PLL frequency selection. Selects among two fixed frequencies and

the programmed frequency of the pixel clock PLL.

PSEL

99

Port select. PSEL provides the capability of switching between direct color and

true color or overlay. Multiple true color or overlay windows may be displayed

using the PSEL control. Since PSEL is sampled with LCLK, the granularity for

switching dependes on the number of pixels loaded per LCLK. If PSEL is not

used, it should be connected to GND.

P33–P16

P19–P18

P22–P0

3–16,

19, 20,

22–39,

I

Pixel input port. The port can be used in various modes as described in

Section 2.6. Unused terminals should not be allowed to float.

P63–P57

P56–P48

P47–P44

P43–P34

113 – 119,

130–138,

141–145,

153–162

†

All unused inputs should be tied to a logic level and not be allowed to float.

1–6

†

1.5 Terminal Functions (Continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

RCLK

127

O

Referenceclock output. RCLKcanbeprogrammedtooutputeitherthepixelclock

PLL (power up default) or the loop clock PLL. The pixel clock PLL is selected to

provide a reference clock to the VGA controller. In this configuration, the VGA

controller returns VGA data and video controls along with a synchronous clock

which becomes the TVP3026 dot clock source via CLK0. For all other modes, the

loop clock PLL is selected to provide the reference clock. In this configuration, the

pixel clock PLL (or external clock) becomes the TVP3026 dot clock source. The

reference clock is used to generate VRAM shift clocks (or clock a VGA controller)

and generate video controls. The pixel port (or VGA port) and video controls are

latched by LCLK. The loop clock PLL controls the phase of RCLK to phase-lock

the received LCLK with the internal dot clock.

For systems that use SCLK as the VRAM shift clock, RCLK should be connected

toLCLK. AnexternalbuffermaybeusedbetweenRCLKandLCLKifSCLKisalso

buffered, within the timing constraints of the TVP3026. RCLK is not gated off

during blank.

REF

80

I/O Voltage reference for DACs. An internal voltage reference of nominally 1.235 V

is provided, which requires an external 0.1-µF ceramic capacitor between REF

and analog GND. However, the internal reference voltage can be overdriven by

an externally supplied reference voltage.

RESET

RD

65

45

I

Master reset. All the registers assume their default state after reset. The default

state is VGA mode 2 (CLK0 latching of VGA data and video controls).

I

Read strobe input. A logic 0 on this terminal initiates a read from the register map.

Read transfer data is enabled onto the D(7–0) bus when RD is low (see

Figure 3–1).

RS3

RS0–R2

43,

56–58

I

Register select inputs. These terminals specify the location in the direct register

map that is to be accessed as shown in Table 2–1.

SCLK

129

O

Shift clock output. SCLK is a gated version of the loop clock PLL output and is

gated off during blank. SCLK may be used to drive the VRAM shift clock directly.

This is intended for designs in which the graphics controller does not supply the

VRAM shift clock.

SENSE

SFLAG

66

O

I

Test mode DAC comparator output signal. This terminal is low if one or more of

the DAC output analog levels is above the internal comparator reference of

350 mV ±50 mV.

108

Splitshiftregistertransferflag. Ahighpulseonthisterminalduringblankispassed

directly to the SCLK terminal. This operation is available to meet the special serial

clocking requirements of some VRAM devices. If SFLAG is not used, SFLAG

should be connected to GND.

SYSBL

104

I

System blank input. SYSBL is active low. This should be selected for all modes

other than VGA mode 2. This signal is pipeline delayed before being passed to

the DACs.

†

All unused inputs should be tied to a logic level and not be allowed to float.

1–7

†

1.5 Terminal Functions (Continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

SYSHS,

101,

102

I

System horizontal and vertical sync inputs. These signals should be selected for

all modes other than VGA mode 2. These signals are pipeline delayed and each

may be inverted before being passed to the HSYNCOUT and VSYNCOUT

terminals. General control register bits GCR(1,0) control the polarity inversion.

If used to generate the sync level on the green current output, SYSHS and

SYSVS must be active low at the input to the TVP3026.

SYSVS

VCLK

128

107

O

Programmableauxiliary clock output. VCLK is derived from the internal dot clock

using a programmable divide ratio and does not utilize the loop clock PLL for

synchronization. Since pixel data and video controls are always referenced to

RCLK and LCLK (or CLK0), use of VCLK for the frame buffer interface or video

timing is not recommended.

VGABL

I

VGA blank input. VGABL is activelow. ThisshouldbeselctedwheninVGAmode

2 (CLK0 latching of VGA data and video controls). VGABL is pipeline delayed

before being passed to the DACs.

VGAHS,

VGAVS

105,

106

VGA horizontal and vertical sync inputs. These signals should be used when in

VGA mode 2 (CLK0 latching of VGA data and video controls). These signals are

pipeline delyed and each may be inverted before being passed to the

HSYNCOUT and VSYNCOUT terminals. General control regiser bits GCR(1,0)

control the polarity inversion. If used to generate the sync level on the green

current output, VGAHS and VGAVS must be active low at the input to the

TVP3026.

VGA7–VGA0

WR

90–97

44

I

VGA port. This bus can be selected as the pixel input bus for VGA modes, but

it does not allow for any multiplexing.

Write strobe input. A logic 0 on this terminal initiates a write to the register map.

Write transfer data is latched from the D(7–0) bus with the rising edge of WR.

XTAL1,

XTAL2

122,

123

I/O Connection for quartz crystal resonator as a reference for the frequency

synthesis PLLs. XTAL2 may be used as a TTL reference clock input, in which

case XTAL1 is left unconnected.

8/6

100

I

DAC resolution selection. This terminal is used to select the data bus width (8 or

6 bits) for the DACs and is provided for VGA downward compatibility. When this

terminal is a logical 1, 8-bit bus transfers are used with D7 the MSB and D0 the

LSB. For 6-bit bus operation, while the color palette RAM still has the 8-bit

information, the data is shifted to the upper six bits and the two LSBs are filled

with zeros at the output multiplexer to the DACs. The palette RAM data register

zeroes the two MSBs when it is read in the 6-bit mode. The function of this

terminal may be overridden in software. If not used, this terminal should be

connected to GND so that 6-bit VGA operation results at power up.

†

All unused inputs should be tied to a logic level and not be allowed to float.

1–8

2 Detailed Description

2.1 Microprocessor Unit Interface

The standard microprocessor unit (MPU) interface is supported, giving the MPU direct access to the

registers and memories of the TVP3026M. The processor interface is controlled using read and write

strobes (RD, WR), four register select terminals (RS3–RS0), the D7–D0 data terminals, and the 8/6-select

terminal. The 8/6 terminal selects between an 8- or 6-bit-wide data path to the color palette RAM and is

provided to maintain compatibility with the IMSG176. See subsection 2.1.1, 8/6 Operation.

Table 2–1 lists the direct register map. These registers are addressed directly by the register select lines

RS0–RS3. Table 2–2 lists the indirect register map. The index for the indirect register map is loaded into

the index register (direct register: 0000). The index register also stores the palette RAM write address and

cursor RAM write address. The indexed data register (direct register: 1010) then reads or writes the register

pointed to in the indirect register map. The index does not post-increment following accesses to the indirect

map.

Table 2–1. Direct Register Map

RS3

RS2

RS1

RS0

REGISTER ADDRESSED BY MPU

R/W

DEFAULT (HEX)

Palette/cursor RAM write address/ index

register

0

R/W

XX

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

1

Palette RAM data

R/W

XX

FF

XX

Pixel read-mask

Palette/cursor RAM read address

Cursor/overscan color write address

Cursor/overscan color data

Reserved

Cursor/overscan color read address

Reserved

R/W

XX

Direct cursor control

Indexed data

R/W

00

XX

Cursor RAM data

Cursor-position X LSB

Cursor-position X MSB

Cursor-position Y LSB

Cursor-position Y MSB

2–1

Table 2–2. Indirect Register Map (Extended Registers)

REGISTER ADDRESSED

INDEX

R/W

DEFAULT

BY INDEX REGISTER

0x00

0x01

Reserved

†

0x00

R

Silicon revision

0x02–0x05

0x06

Reserved

R/W

0x00

0x06

Indirect cursor control

Reserved

0x07–0x0E

0x0F

Latch control

0x10–0x17

0x18

Reserved

R/W

0x80

0x98

0x07

True color control

Multiplex control

Clock selection

0x19

0x1A

0x1B

Reserved

0x1C

R/W

0x00

Palette page

0x1D

General control

0x1E

Miscellaneous control

Reserved

0x1F–0x29

0x2A

R/W

R

0x00

XX

General-purpose I/O control

General-purpose I/O data

PLL address

0x2B

0x2C

XX

0x2D

XX

Pixel clock PLL data

Memory clock PLL data

Loop clock PLL data

Color-key overlay low

Color-key overlay high

Color-key red low

Color-key red high

Color-key green low

Color-key green high

Color-key blue low

Color-key blue high

Color-key control

MCLK/loop clock control

Sense test

0x2E

XX

0x2F

XX

0x30

XX

0x31

XX

0x32

XX

0x33

XX

0x34

XX

0x35

XX

0x36

XX

0x37

XX

0x38

0x00

0x18

0x00

XX

0x39

0x3A

0x3B

Test mode data

0x3C

R

XX

CRC remainder LSB

†

Silicon revision register is 0x00 for the first pass silicon (see subsection 2.11.4,

Silicon Revision).

NOTE 1: Reserved registers should be avoided; otherwise, circuit behavior could

deviate from that specified.

2–2

Table 2–2. Indirect Register Map (Extended Registers) (Continued)

REGISTER ADDRESSED

INDEX

R/W

DEFAULT

BY INDEX REGISTER

CRC remainder MSB

CRC bit select

0x3D

0x3E

0x3F

0xFF

R

W

R

XX

0x26

XX

ID

W

Software reset

NOTE 1: Reserved registers should be avoided; otherwise, circuit behavior

could deviate from that specified.

2.1.1

8/6 Operation

The 8/6 terminal, which selects between an 8-bit (set to 1) or 6-bit (reset to 0) data path to the color palette

RAM, is provided in order to maintain compatibility with the INMOS IMSG176. When miscellaneous control

register bit 2 (MSC2) is set to 1, the 8/6 terminal is disabled and 8/6 operation is controlled by bit 3 of the

miscellaneouscontrolregister(MSC3). Theresetdefaultisforthe8/6terminaltobeenabled(miscellaneous

control register bit 2 = 0, see Section 2.2, Color Palette RAM).

2.1.2

Pixel Read Mask Register

The pixel read mask register (direct register: 0010) is an 8-bit register that enables or disables a bit-plane

from addressing the color palette RAM in the pseudo-color and VGA modes. Each palette address bit is

logically ANDed with the corresponding bit from the read mask register before going to the palette page

register and addressing the palette RAM.

2.1.3

Palette Page Register

The palette page register (index: 0x1C) allows selection of multiple color look-up tables stored in the palette

RAM when using a mode that addresses the palette RAM with less than 8 bits. When using 1, 2, or

4 bit-planes in the pseudo-color or direct-color + overlay modes, the additional planes are provided from the

page register before the data addresses the color palette. This is illustrated in Table 2–3.

NOTE

The additional bits from the page register are inserted after the read mask.

The palette page register specifies the additional bit-planes for the overlay field in

direct-color modes with less than 8 bits per pixel overlay.

†

Table 2–3. Allocation of Palette Page Register Bits

NUMBER OF BIT-PLANES

MSB

M

PALETTE ADDRESS BITS

LSB

M

8

4

2

1

M

P7

P6

P5

P4

M

P3

P2

M

P1

M

†

M = bit from pixel port and Pn = n bit from page register.

2–3

2.1.4

Cursor and Overscan Color Registers

The registers for the three cursor colors and the overscan border color are accessed through the direct

register map. See Section 2.9, Overscan Border description and subsection 2.7.3, Three-Color 64 X 64

Cursor, for use of the cursor colors.

The color write address register (direct register: 0100) must be initialized before writing to the color registers.

The lower two bits of this register select one of the four color registers according to Table 2–4. The selected

24-bit color register is loaded a byte at a time by writing a sequence of three bytes (red, green, and blue)

to the color data register (direct register: 0101). After the blue byte is written, the color address register

increments to the next color. All four colors can be loaded with a single write to the color write address

register followed by 12 consecutive writes to the color data register.

The color read address register (direct register: 0111) must be initialized before reading from the color

registers. ThelowertwobitsofthisregisterselectoneofthefourcolorregistersaccordingtoTable2–4. Next,

the color data register (direct register: 0101) is read three times, producing red, green, and blue bytes from

the selected register. After the blue byte is read, the color address register is incremented to the next color.

All four colors can be read with a single write to the color read address register followed by 12 consecutive

reads of the color data register.

The sequence followed by the color address register is overscan color, cursor color 0, cursor color 1, cursor

color 2, . . ., etc. The starting point depends on what was written to the color write address or color read

address register.

Table 2–4. Color Register Address Format

BIT 1

BIT 0

REGISTER

Overscan color

Cursor color 0

Cursor color 1

Cursor color 2

0

1

0

1

0

1

2.2 Color Palette RAM

The color palette RAM is addressed by an internal 8-bit address register for reading/writing data from/to the

RAM. This register is automatically incremented following a RAM transfer, allowing the entire palette to be

read/written with only one access of the address register. When the address register increments beyond

the last location in RAM, it is reset to the first location (address 0). All read and write accesses to the RAM

are asynchronous to the internal clocks but are performed within one dot clock. Therefore, read/write

accesses do not cause any noticeable disturbance on the display.

The color palette RAM is 24 bits wide for each location and 8 bits wide for each color. Since a MPU access

is 8 bits wide, the color data stored in the palette is eight bits when the 6-bit mode is chosen. When the 6-bit

modeischosen, thetwoMSBsofcolordatainthepalettehavethevaluespreviouslywritten. However, when

they are read back in the 6-bit mode, the two MSBs are zeros to be compatible with INMOS IMSG176 and

BrooktreeBt176. TheoutputmultiplexershiftsthesixLSBbitstothesixMSBpositionsandfillsthetwoLSBs

with 0s after the color palette. The multiplexer then feeds the data to the DAC. The test mode data register

and the cyclic redundancy check (CRC) calculation both take data after the output multiplexer, enablingtotal

system verification. The color palette access is described in the following two sections, and it is fully

compatible with IMSG176/8 and Bt476/8.

2–4

2.2.1

Writing to Color Palette RAM

To load the color palette, the MPU must first write to the color palette RAM write address register (direct

register: 0000) with the address where the modification is to start. The selected color palette RAM location

is loaded a byte at a time by writing a sequence of three bytes (red, green, and blue) to the palette RAM data

register (direct register: 0001). After the blue write cycle, the color palette RAM address register increments

to the next location, which the MPU can modify by simply writing another sequence of red, green, and blue

data.

2.2.2

Reading From Color Palette RAM

Reading from the color palette RAM is performed by writing to the palette read address register (direct

register: 0011) with the location to be read. Three successive MPU reads from the palette RAM data register

produce red, green, and blue color data (6 or 8 bits depending on the 8/6 mode) for the specified location.

Following the blue read cycle, the address register is incremented. Since the color palette RAM is dual

ported, the RAM can be read during active display without disturbing the video.

2.3 Clock Selection

The TVP3026M VIP provides a maximum of four clock inputs (CLK0, CLK1, and CLK2/CLK2) that can be

selected as two TTL inputs and a differential ECL input or as four TTL inputs. The TTL inputs can be used

for video rates up to 140 MHz while the differential ECL can be utilized up to the device limit. At reset, CLK0

is selected as the clock source for VGA mode 2. This power-up state supports VGA pass-through operation

without requiring software intervention.

An alternative clock source can be selected in the clock-selection register (index: 0x1A) during normal

operation. The chosen clock input is then used as the dot clock (representing pixel rate to the monitor, see

Table 2–5).

There are two ways of using CLK0 as a clock source. When CSR(2–0) = 111, CLK0 is selected as the clock

source to generate the internal dot clock (see Table 2–6). In this mode, multiplex control register bit MCR6

must be set to 1 and only the VGA port can be used. Setting MCR6 selects latching of VGA7 – VGA0 and

VGABL with CLK0. When CSR2 – CSR0 = 000, CLK0 is also selected as the clock source to generate the

internal dot clock. However, in this mode, MCR6 must be logic 0, which selects latching of VGA7 – VGA0

and SYSBL with LCLK. In this mode, the pixel port or the VGA port can be used.

Additionally, two crystal oscillator terminals (XTAL1, XTAL2) are provided for the integrated pixel clock and

memory clock frequency synthesis PLLs. These terminals are intended for use with a quartz crystal

resonator, but a discrete oscillator can also be utilized and input on XTAL2 (XTAL1 should be left floating

in this case).

Selection of the pixel clock PLL as the pixel clock source is performed by programming the clock selection

register. In general, when the pixel clock PLL is to be selected, it should be selected after the PLL has been

programmed and allowed to achieve lock.

2–5

Table 2–5. Clock Selection Register Bits CSR(6–4)

(Index: 0x1A, Access: R/W, Default: 0x07)

CLOCK SELECT REGISTER BITS

VCLK FREQUENCY

6

0

1

5

0

1

0

1

4

0

1

0

1

0

1

0

1

Dot clock

Dot clock/2

Dot clock/4

Dot clock/8

Dot clock/16

Dot clock/32

Dot clock/64

Reset to 0

NOTE 2: Bit CSR7 enables the SCLK output when set to 1.

Table 2–6. Clock Selection Register Bits CSR(3–0) (Index: 0x1A, Access: R/W, Default: 0x07)

CLOCK SELECT REGISTER BITS

FUNCTION

3

2

1

0

Select CLK0 as clock source (for use with LCLK latching of VGA port). See

subsection 2.6.2, VGA Modes.

0

1

0

1

0

1

0

1

0

1

0

1

Select CLK1 as clock source

Select CLK2 as TTL clock source

Select CLK2 and CLK2 as ECL clock source

Select pixel clock PLL as clock source

Disable internal dot clock for reduced power consumption.

Select CLK0 as clock source (for use with CLK0 latching of VGA port). See

subsection 2.6.2, VGA Modes.

1

X

Reserved

x = do not care

2.4 PLL Clock Generators

In addition to externally supplied clock sources, the TVP3026M has three on-chip, fully programmable,

frequency-synthesis phase-locked loops (PLLs). The first PLL, pixel clock, is intended for pixel clock

generation for frequencies up to the device limit. The second PLL, MCLK, is provided for general system

clocking such as the system clock or memory clock, and the third PLL ,called the loop clock PLL, is useful

for synchronizing pixel data and latch timing by compensating for system loop delay.

P

The clock generators use a modified M over (N × 2 ) scheme to enable a wide range of precise frequencies.

(Appendix A provides a listing of all frequencies that can be synthesized and the register values for each.)

The advanced PLLs utilize an internal loop filter to provide maximum noise immunity and minimum jitter.

Except for the reference crystal or oscillator, no external components or adjustments are necessary. Each

PLL can be independently enabled or disabled for maximum system flexibility. Figure 2–1 illustrates the

TVP3026M PLL clocking scheme. The PLLs are programmed through a group of four registers in the

TVP3026M indirect register map. The registers are listed in Table 2–7.

2–6

Table 2–7. PLL Top-Level Registers

INDEX

REGISTER

0x2C

0x2D

0x2E

0x2F

PLL address register (PAR)

Pixel clock PLL data register (PPD)

MCLK PLL data register (MPD)

Loop clock PLL data register (LPD)

The PLL address register (PAR) points to the M-value, N-value, P-value, and status registers of each PLL.

This register also allows read and write access and contains three 2-bit pointers, one for each PLL,

according to the Table 2–8. Each pointer can be programmed independently.

Table 2–8. PLL Address Register

(Index: 0x2C, Access: R/W, Default: Uninitialized)

PAR BITS

1–0

POINTER

Pixel clock PLL data register pointer

MCLK PLL data register pointer

Loop clock PLL data register pointer

3–2

5–4

Each PLL data register pointer directs its associated PLL to one of its four PLL registers according to

Table 2–9.

Table 2–9. PLL Data Register Pointer Format

BIT 1

BIT 0

REGISTER

N-value register

0

1

0

1

0

1

M-value register

P-value register

Status register (read only)

Once the PLL data register pointers are set, the selected register is accessed through the pixel clock PLL

dataregister(index:0x2D), MCLKPLLdataregister(index:0x2E), ortheloopclockPLLdataregister(index:

0x2F). The PLL data register pointer bits are independently autoincremented following a write cycle to the

corresponding PLL data register. The current state of each pointer can be identified by reading the PLL

address register (index: 0x2C). The PLL data register pointer bits do not autoincrement following a read

cycle of the PLL data registers.

The most efficient way to program the pixel clock PLL is to first write zeros to PLL address register bits

PAR(1,0) followed by three consecutive writes to the pixel clock PLL data register to program the N-, M-,

and P-value registers. Following the third write, the pixel clock PLL pointer points to the read-only status

register. The status register can then be polled until the LOCK bit is set (the pointer does not autoincrement

on reads). For test purposes, the pixel clock PLL can be output on PCLKOUT by setting the pixel clock PLL

P-value register bit 6 to 1.

2–7

RCLK

VCLK

LCLK

Loop

Clock PLL

CLK0–2/2

Pixel Clock

PLL

VCLK

Divider

XTAL2

XTAL1

Internal

Dot Clock

Crystal

Amplifier

PCLKOUT

MCLK

PLL

Figure 2–1. TVP3026M Clocking Scheme

2.4.1

Pixel Clock PLL

The pixel clock PLL can be used at frequencies up to the device limit. Appendix A provides optimal register

values for all frequencies that can be synthesized using the common 14.31818-MHz reference. The

following equations describe the voltage controlled oscillator frequency and the PLL output frequency for

the pixel clock PLL as a function of the N, M, and P values and the reference frequency f

.

REF

The frequency of the voltage controlled oscillator (VCO) is given by:

65

M

N

(1)

f

8

F

VCO

Provided:

REF

Minimum VCO Frequency

F

Maximum VCO Frequency

VCO

Then the PLL output frequency is :

F

VCO

F

(2)

PLL

P

2

The N-, M-, and P-value registers can be programmed to any value within the following limits:

40

1

N(5–0)

M(5–0)

P(1, 0)

62

0

3

The bit assignments of the N-value, M-value, P-value, and the status register for the pixel clock PLL are

giveninTable2–10. Thebitsshownassetto0or1mustbewrittenwiththesefixedvalues. PCLKENenables

the pixel clock PLL output onto the PCLKOUT output terminal when set to 1. When PCLKEN is reset to 0,

the PCLKOUT terminal is held at 0. PLLEN resets the PLL to 0 and enables the PLL to oscillate when set

to 1. When PFORCE is set to 1, the pixel clock PLL uses its programmed N, M, and P registers and ignores

PLLSEL1 and PLLSEL0. When LFORCE is set to 1, the loop clock PLL uses its programmed N, M, and P

registers and ignores PLLSEL1 and PLLSEL0. The LOCK status bit indicates that the PLL has locked to

the selected frequency when set to 1. The remaining status register bits are for test purposes.

2–8

†

Table 2–10. Pixel Clock PLL Registers

REGISTER

N value

BIT 7

BIT 6

BIT 5

N5

M5

1

BIT 4

N4

M4

1

BIT 3

N3

BIT 2

BIT 1

N1

M1

P1

BIT 0

N0

M0

P0

1

0

1

0

N2

M2

M value

M3

P value

PLLEN PCLKEN

LOCK

LFORCE PFORCE

Status

X

†

X = do not care

2.4.1.1 Pixel Clock PLL Frequency Selection

The pixel clock PLL frequency can be selected using the PLL select inputs PLLSEL1 and PLLSEL0 as

shown in Table 2–11. The first two selections are fixed frequency settings for standard VGA operation. Use

of a standard 14.31818 MHz crystal is assumed. When PLLSEL1 is set to 1, the frequency specified by the

pixel clock PLL N-, M-, and P-value registers is selected. When PLLSEL1 is set to 1 at power up or during

a software reset, the pixel clock PLL N-, M-, and P-value registers default to settings for 25.057 MHz, but

with the PLL disabled. Therefore, the system must reset PLLSEL1 and PLLSEL0 to 0 and X, respectively,

when a software reset occurs or the pixel clock PLL and RCLK stops oscillating.

The frequency select inputs also apply to the loop clock PLL. When a fixed frequency is selected PLLSEL1

and PLLSEL0 = 0x), the loop clock PLL passes the dot clock frequency to the RCLK multiplexer. Internal

feedbackisused, noexternalsignalpathfromRCLKtoLCLKisrequired. WhenPLLSEL1is1, thefrequency

specified by the loop clock PLL N-, M-, and P-value registers is selected.

For VGA Mode 1, the pixel clock PLL is normally selected as the dot clock source (CSR = 0x05) and the

RCLK terminal passes the loop clock PLL output (MCK5 = 1). Then, when PLLSEL1 and PLLSEL0 changes

between a programmed frequency and a fixed frequency, the loop clock PLL automatically changes with

it. The loop clock PLL does not require reprogramming.

For VGA Mode 2, CLK0 should be selected as the dot clock source (CSR = 0x07) and the RCLK terminal

should pass the pixel clock PLL output (MCK5 = 0). In this case, the loop clock PLL should be disabled (bit

P7 = 0) since its output is not used.

Table 2–11. Pixel Clock PLL Frequency Selection

†

PIXEL CLOCK PLL FREQUENCY

25.057 MHz

LOOP CLOCK PLL FREQUENCY

Pass DOT CLOCK, internal feedback

PLLSEL1

PLLSEL0

0

1

0

1

28.636 MHz

X

Programmed by pixel clock PLL registers Programmed by loop clock PLL registers

†

X = do not care

2–9

2.4.2

Memory Clock PLL

The memory clock (MCLK) PLL can be used at frequencies up to 100 MHz. Appendix A provides optimal

register values for all frequencies that can be synthesized using the common 14.31818-MHz reference. The

MCLK PLL maximum output frequency of 100 MHz should not be exceeded. The equations for the VCO

frequency and for the PLL output frequency are the same as for the pixel clock PLL.

65

M

N

f

8

f

(3)

VCO

Provided:

REF

Minimum VCO Frequency

F

Maximum VCO Frequency

VCO

Then the PLL output frequency is :

f

VCO

f

(4)

PLL

P

2

The N-, M-, and P-value registers can be programmed to any value within the following limits:

40

1

N(5–0)

M(5–0)

P(1, 0)

62

0

3

ThebitassignmentsoftheN-, M-, P-value, andthestatusregisterfortheMCLKPLLaregiveninTable 2–12.

The bits shown as 0 or 1 must be written with these fixed values. PLLEN resets the PLL with 0 and enables

the PLL to oscillate when set to 1. When set to 1, the LOCK status bit indicates that the PLL has locked to

the selected frequency. The remaining status register bits are for test purposes. The MCLK PLL and loop

clock PLL are further controlled by the MCLK/loop clock control register shown in Table 2–13.

†

Table 2–12. MCLK PLL Registers

REGISTER

N value

M value

P value

Status

BIT 7

BIT 6

BIT 5

N5

M5

1

BIT 4

N4

M4

1

BIT 3

N3

M3

0

BIT 2

N2

M2

0

BIT 1

N1

M1

P1

BIT 0

N0

M0

P0

1

0

PLLEN

X

0

LOCK

X

†

X = do not care

2–10

Table 2–13. MCLK/Loop Clock Control Register (Index: 0x39 hex, Access: R/W, Default: 0x18)

BIT NAME

VALUES

DESCRIPTION

MKC7

0

Reserved

MKC6,

MKC5

00: Pixel clock PLL

(default)

01: Loop clock PLL

10: Dot clock /N

11: Reserved

MKC6 and MKC5 select the signal to output on the RCLK terminal. Pixel

clock PLL is selected as default to support VGA mode 2. In VGA mode

2, the graphics accelerator receives RCLK and returns its VGA output

clocktotheCLK0terminalalongwithsynchronousVGAdata.Selectloop

clock PLL for all modes using LCLK data latching. The dot clock /Noption

provides the output of the loop clock PLL N prescaler. This signal is a low

pulse, one dot clock wide, with a repetition rate of F

/ (65–N).

REF

MKC4

MKC3

0: Dot clock

1: MCLK PLL (default)

MKC4 selects the signal to output on the MCLK terminal. MCLK PLL is

selected as default. Select dot clock to ensure a stable output on MCLK

while MCLK PLL frequency is reprogrammed. See subsection 2.4.2.1,

Changing the MCLK Frequency. A change of this bit does not take effect

until MKC3 bit transitions from 0 to 1. During this transistion, the MKC4

bit should not be changed.

0:

Strobe for MCLK terminal output multiplexer control (MKC4). A 0 to 1

transition of this bit strobes in bit MKC4, causing bit MKC4 to take effect.

While MKC3 is transitioning from 0 to 1, MKC4 should not be changed.

1: (default)

MKC2, MKC1, 000: Divide by 2 (default) Loop clock PLL post scalar Q divider. This additional frequency division

P

MKC0

001: Divide by 4

010: Divide by 6

011: Divide by 8

100: Divide by 10

101: Divide by 12

110: Divide by 14

111: Divide by 16

is applied after the 2 division of the loop clock PLL P-value register. For

a binary value of Q in MKC2–MKC0, the resulting frequency division is

2 × (Q+1).

After the device resets, the MCLK PLL outputs a 50.11-MHz clock frequency and the pixel clock PLL output

depends on the PLLSEL1 and PLLSEL0 inputs according to Table 2–11. These frequencies assume a

standard 14.31818-MHz crystal reference. The actual output frequencies are proportional to the reference

frequency used.

2.4.2.1 Changing the MCLK Frequency

The MCLK is normally used as the graphics controller system clock and memory clock. During

reprogrammingof the PLLs, a wide range of unpredictable frequencies are generated as the PLL transitions

tothenewprogrammedfrequency. These transition effects can produce unwanted results in some systems.

The TVP3026M provides a mechanism for smooth transitioning of the MCLK PLL. The following

programming steps are recommended.

1. Disable the pixel clock PLL (PLLEN bit = 0). Program the pixel clock PLL N, M, and P registers

(with PLLEN bit = 1) to the same frequency to which MCLK is to be changed. Poll the pixel clock

PLL status until the LOCK bit is set to 1.

2. Select the pixel clock PLL as the dot clock source if it is not already selected.

3. Switch to output dot clock on the MCLK terminal by writing bits MKC4 and MKC3 to 0,0 followed

by 0,1 in the MCLK/loop clock control register.

4. Disable the MCLK PLL (PLLEN bit = 0). program the MCLK PLL N, M, and P registers (with

PLLEN bit = 1) for the new frequency. Poll the MCLK PLL status until the LOCK bit is set to 1.

5. Switch to output MCLK on the MCLK terminal by writing bits MKC4 MKC3 to 1 and 0 respectively,

followed by 1 and 1 respectively in the MCLK/loop clock control register.

2–11

6. Disable the pixel clock PLL (PLLEN bit = 0). Program the pixel clock PLL N, M, and P registers

(with PLLEN bit = 1) for the original operating pixel frequency. Poll the pixel clock PLL status until

the LOCK bit is set to 1.

2.4.3

Loop Clock PLL

Many of the current high performance graphics accelerators with built-in VGA support prefer to generate

their own VRAM shift clock and pixel data latching clock (LCLK) as discussed in subsection 2.5.2,

Frame-Buffer Timing Without Using SCLK. As stated before, the TVP3026M provides an RCLK timing

reference output to be used by the graphics controller to generate these signals. A common industry

problemexists, however, inthatthedelaythroughtheloop(i.e., fromRCLKthroughthecontrollertoproduce

LCLK and pixel data) can be greater than the RCLK cycle time minus setup time. It then becomes very

difficult to resynchronize the rising edges of the LCLK signal to the internal dot clock within the specified

timing requirements. Variations in graphics accelerator propagation delays from device to device can cause

severe production problems at the board level. The TVP3026M incorporates a unique loop clock PLL circuit

to maintain a valid LCLK/dot clock phase relationship and ensure that proper LCLK and pixel data setup

timing is met, regardless of the amount of system loop delay.

After device reset, the loop clock PLL provides the dot clock frequency to the RCLK output multiplexer.

However, the RCLK output multiplexer ignores the loop clock PLL output and instead passes the pixel clock

PLLoutputtotheRCLKterminal, whichprovidesareferenceclocktotheVGAcontroller. Inthisconfiguration

(VGA mode 2), the VGA controller returns VGA data and video controls along with a synchronous clock that

becomes the TVP3026M dot clock source using CLK0. The PLLSEL1 and PLLSEL0 lines select either the

25.057 MHz or 28.636-MHz VGA frequencies.

Figure 2–2 illustrates the pixel data latching structure and the operation of the loop clock PLL. The selected

clock source generates the dot clock, which drives most of the digital logic of the TVP3026M. The dot clock

isusedasareferencefrequencybytheloopclockPLLandissubdividedasspecifiedbytheN-valueregister.

The incoming LCLK is used as the other input of the PLL and is subdivided as specified by the M value

register. The PLL generates RCLK with the proper frequency and phase shift to phase align the divided dot

clock anddividedLCLK. ThepixelbusislatchedontherisingedgeofLCLKandthenalignedwiththeinternal

dot clock to synchronize with internal logic.

Input Data Latch Structure

P63–P0

D Q

VRAM

D Q

TVP3026M

LCLK

Graphics

Accelerator

Loop Clock

PLL

RCLK

Dot

Clock

Dot Clock

Generator

CLKx

From Pixel Clock PLL

Figure 2–2. Loop Clock PLL Operation

The bit assignments of the N-value, M-value, P-value, and the status register for the loop clock PLL are

shown in Table 2–14. The bits shown as 0 or set to 1 must be written with these fixed values. When cleared

to 0, PLLEN disables the PLL and when set to 1, enables the PLL to oscillate. When reset to 1,the LOCK

status bit indicates that the PLL has locked to the selected frequency. The remaining status register bits are

for test purposes.

2–12

The N-value, M-value, and P-value registers can be programmed to any value within the following limits.

1

0

N(5–0)

M(5–0)

P(1, 0)

62

3

LESEN enables the LCLK edge synchronizer function and should be set to 1 whenever a packed-24 mode

is used. In the packed-24 modes, only one LCLK rising edge per pixel group is aligned with the internal dot

clock. For example, in 8:3 packed-24 mode, only one of the three LCLKs is aligned to the internal dot clock.

The LCLK edge synchronizer function allows selection of which LCLK edge in the sequence of pixel bus

words is aligned with the internal dot clock. For each packed-24 mode there is an optimum setting for the

LCLK edge synchonizer delay LES1 and LES0. See Table 2–15 and subsection 2.6.6, Packed-24 Mode,

for more details.

†

Table 2–14. Loop Clock PLL Registers

REGISTER

N value

BIT 7

1

BIT 6

1

BIT 5

N5

M5

1

BIT 4

N4

M4

1

BIT 3

N3

BIT 2

N2

M2

0

BIT 1

N1

M1

P1

BIT 0

N0

M0

P0

M value

LES1

PLLEN

X

LES0

1

M3

P value

LESEN

X

Status

LOCK

X

†

X = do not care

2.4.3.1 Programming for All Modes Except Packed-24

For all modes except packed-24, programming of the loop clock PLL registers depends on the system

configuration, pixel rate, color depth, and pixel bus width. In addition, the internal VCO must be within its

operating range of 110 MHz to 220 MHz for the required RCLK output frequency. To determine the proper

M, N, P, and Q register values, one should know the following:

•

Dot clock frequency (MHz) (f ) – pixel rate

D

Bits/pixel (B) – bits/pixel including overlay fields

Pixel bus width (W) – total pixel bus width used for this mode

External division factor (K) – external frequency division between RCLK output and LCLK input

The dot clock frequency can either be generated by the on-chip pixel clock PLL or by an external clock

source. The following two parameters can be easily calculated from the above parameters.

•

LCLK frequency (MHz) (f ) – frequency at which the pixel bus is loaded by the TVP3026M

L

RCLK frequency (MHz) (f ) – frequency at RCLK output terminal of TVP3026M

R

The LCLK frequency is given by:

B

(5)

(6)

f

L

D

W

The RCLK frequency is f times the external divide factor. When no external divide factor, K = 1.

L

B

W

f

K

f

K

f

R

L

D

The N and M values are set as follows:

W

N

65

61

4

B

M

The P and Q frequency dividers must be programmed so that the VCO is within its operating range of

110 MHz – 220 MHz. The VCO frequency is post-scaled by the P-divider followed by the Q-divider. The

2–13

P-divider register (P) can take on values of 0, 1, 2, or 3, which correspond to division factors of 1, 2, 4, or

8. The Q-divider register (Q) is stored in bits 2 – 0 of the MCLK/loop clock control register (index: 0x39) and

can take on values of 0, 1, 2, . . ., 7 which correspond to division factors of 2, 4, 6, . . ., 16. The total post-scalar

frequency division factor is:

(

)

N

f

65

VCO

4

(7)

P

1

(

)

1

Z

2

Q

f

K

D

Next, set f

to the lower limit of 110 MHz and solve for Z:

VCO

(

)

N

27.5

65

K

(8)

Z

f

D

Finally, determine the P and Q values:

If Z

16 then P

TRUNC (log₂Z), Q

Z

0

16

3, Q

INT

1

Set bits 7 and 6 of the N-value register to 1,1 (default). Set LES1 and LES0 in the M-value register (bits 7,6)

to 0,0 (default). Set bits 7–2 of the P-value register to 1111 00. This enables the PLL to oscillate and disables

the LCLK edge synchronizer function, which is only used for packed-24 modes. Reset the PLL bit 7 of the

P-value register to 0.

2.4.3.2 Programming for Packed-24 Modes

For packed-24 modes, the loop clock PLL is programmed according to Table 2–15. The LCLK edge

synchronizer delay (M-value register bits 7 and 6) depends on whether the graphics accelerator is driving

the VRAM shift clock (true color control register bit TCR5 is cleared to 0) or the TVP3026M is driving the

VRAM shift clock (TCR5 = 1). See subsection 2.6.6, Packed-24 Mode, for a typical setup procedure for

packed-24 modes. As shown in Table 2–15, a different setting is required for the M-value register in the 4:3

multiplex mode depending on the silicon revision. Software can determine the silicon revision by reading

the silicon revision register at index 0x01 (a value ≤ 0x20 indicates revision A and ≥ 0x21 indicates revision

B).

Table 2–15. Loop Clock PLL Settings for Packed-24 Mode

BIT TCR5

(Index 0x18)

M-VALUE REGISTER M-VALUE REGISTER

PACKED-24 MODE

N-VALUE REGISTER

TVP3026MA

TVP3026MB

4:3

8:3

5:4

5:2

4:3

8:3

5:4

5:2

0

1

0xFD

0×F9

0×FC

0×FD

0×F9

0×FC

0×BE

0x3E

0×BE

0×3D

0×7F

0×3E

0×BE

0×3E

0×BD

0×FF

2–14

The latch-control register definition is listed in Table 2–16.

Table 2–16. Latch-Control Register (Index: 0x0F, Access: R/W, Default: 0x06)

BIT NAME

VALUES

00

DESCRIPTION

LCR7, LCR6

Reserved

0×06

All 1:1, 4:1, 8:1, and 16:1 multiplex modes.

All 2:1 multiplex modes.

8:3 packed-24 or

0×07

4:3 packed-24 (revision A)

0×08

0×20

0×1F

0×1E

0×1C

0×18

4:3 packed-24 (revision B)

LCR5–LCR0

5:2 packed-24

5:4 packed-24, ×1 horizontal zoom

5:4 packed-24, ×2 horizontal zoom

5:4 packed-24, ×4 horizontal zoom

5:4 packed-24, ×8 horizontal zoom

The P and Q frequency dividers must be programmed so that the VCO is within its operating range of 110

MHz to 220 MHz. The VCO frequency is post scaled by the P divider followed by the Q divider. The P-divider

register (P) can take on values of 0, 1, 2, or 3, which correspond to division factors of 1, 2, 4, or 8. The

Q-divider register (Q) is stored in bits 2 – 0 of the MCLK/loop clock control register (index: 0x39) and can

take on values of 0, 1, 2, . . ., 7, which correspond to division factors of 2, 4, 6, . . ., 16. The total post-scalar

frequency division factor is:

f

VCO

65

N

M

(9)

P

1

(

)

1

Z

2

Q

f

K

D

Next, set F

to the lower limit of 110 MHz and solve for Z:

VCO

110

65

N

M

(10)

Z

f

K

D

Finally, determine the P and Q values:

If Z

16 then P

TRUNC log Z , Q

2

0

Z

16

3, Q

INT

1

Set bits 7–2 of the P-value register to 1111 10. This enables the PLL to oscillate and enables the LCLK edge

synchronizer function. To reset the PLL, clear bit 7 of the P-value register to 0.

2.4.3.3 Typical Device Connection

After reset, the TVP3026M defaults to VGA mode 2 (VGA pass through mode, see subsection 2.6.2, VGA

Modes) as do other devices in the TVP302x family. The RCLK terminal outputs the pixel clock PLL

frequency, which is selected by PLLSEL1 and PLLSEL0. CLK0 is selected as the clock source and the VGA

port is selected as well as VGABL, VGAHS, and VGAVS; all these are latched with CLK0. The MCLK PLL

outputs the default 50.11-MHz clock frequency.

Figure 2–3 shows the typical device connection for a system with VRAM clocked by the graphics

accelerator. After power up, the pixel clock PLL is output on RCLK and this clock drives the graphics

accelerator VGA controller and video timing logic. The accelerator output clock is output synchronous to

the VGA data and is input to the TVP3026M CLK0 input as the dot clock source.

2–15

VRAM

P63–P0

VGA7–VGA0

MCLK

RCLK

Graphics

Accelerator

TVP3026M

CLK0

LCLK

Figure 2–3. Typical Configuration – VRAM Clocked by Accelerator

Figure 2–4 shows the typical device connection for a system with VRAM clocked by the TVP3026M. In this

case, the RCLK is tied back to the LCLK and this same clock drives the graphics-accelerator VGA controller

and video timing logic. If necessary, the RCLK and SCLK signals can be externally buffered within the timing

constraints (RCLK to LCLK delay) of the TVP3026M. The pixel clock PLL is output on RCLK after power

up.

VRAM

P63–P0

SCLK

VGA7–VGA0

Graphics

MCLK

Accelerator

TVP3026M

CLK0

RCLK

LCLK

Figure 2–4. Typical Configuration – VRAM Clocked by TVP3026M

For high resolution modes in both configurations, the pixel data is received from VRAM and the loop clock

PLL adjusts RCLK so that the received LCLK is aligned with the internal dot clock. The loop clock PLL must

be selected for output on the RCLK terminal. The pixel clock PLL (or an external clock source) should be

selected as the dot clock source.

2.5 Frame-Buffer Interface

The TVP3026M provides two output clock signals and one input clock signal for controlling the frame-buffer

interface — SCLK, RCLK, and LCLK. The VCLK output is a division of the internal dot clock and has no

ensured phase relationship with RCLK. Therefore, VCLK should not be used for frame-buffer interface

timing (pixel data and video controls). VCLK can drive general-purpose external logic. Clocking of the

frame-buffer interface is discussed in subsection 2.5.1, Frame-Buffer Clocking. The 64-bit pixel bus allows

many operational display modes as defined in Section 2.6, Multiplexing Modes of Operation, and Table

2–17. The pixel latching sequence is initiated by a rising edge on LCLK. For those multiplexed modes in

which multiple pixels are latched on one LCLK rising edge, the pixel clock shifts the pixels out, starting with

the pixels that reside on the low numbered pixel port terminals. For example, in an 8-bit-per-pixel

pseudo-color mode with an 8:1 multiplex ratio, the pixel display sequence is P7–P0, P15–P8, P23–P16,

P31–P24, P39–P32, P47–P40, P55–P48, and P63–P56.

TheTVP3026Mframe-bufferinterfacealsosupportslittle-andbig-endiandataformatsonthepixelbus. This

can be controlled by general-control register (GCR) bit 3. See subsection 2.6.1, Little-Endian and

Big-Endian Data Format, for details of operation.

2–16

2.5.1

Frame-Buffer Clocking

The TVP3026M provides SCLK and RCLK signals, allowing for flexibility in the frame-buffer interface timing.

For the pixel port (P63–P0), data is always latched on the rising edge of LCLK. If TCR5 in the true-color

control register is set to 1, use of SCLK is assumed and internal pipeline delay is added to Sync and Blank

to account for the delay in the generation of SCLK. When TCR5 bit clears to 0 (default), then this pipeline

delay is not added, and SCLK should not be used.

2.5.2

Frame-Buffer Timing Without Using SCLK

For those systems where the color palette data latch clock (LCLK) and VRAM shift clock are generated by

the graphics controller, the TVP3026M SCLK output is not utilized. In these systems, RCLK should be

connected to the graphics controller to provide the timing reference for pixel data and video control signals.

LCLK should be a delayed version of RCLK such that the pixel data and video control signals meet the setup

and hold requirements relative to the rising edge of LCLK. LCLK can be a frequency-divided and delayed

version of RCLK as long as linear phase changes in RCLK produce linear phase changes in LCLK (and the

pixel data). Bit TCR5 in the true-color control register must be reset to 0 when SCLK is not being used, so

that additional pipeline delay in the video controls is not inserted.

ThefirstLCLKrisingedgeoutofblanklatchesthefirstpixelgroup. ThelastLCLKrisingedgeduringblanking

latches the last pixel group. Figure 2–5 shows typical frame-buffer timing for this case. In Figure 2–5, the

delay from RCLK to SYSBL and P63–P0 depends on the total system loop delay through the graphics

accelerator and the VRAM. This delay can be as long as is required. It need not be less than the RCLK cycle

time.

RCLK

SYSBL

1st

Group

2nd

Group

3rd

Group

4th

Group

P63–P0

LCLK

Last Group of Pixel Data

Latch Last Group of Pixel Data

and SYSBL High

Latch First Group of Pixel Data

and SYSBL High

Figure 2–5. Frame-Buffer Timing Without Using SCLK

2.5.3

Frame-Buffer Timing Using SCLK

The SCLK signal, which is generated in the TVP3026M, can be directly connected to VRAM, providing the

shift clock-to-clock data from VRAM into the TVP3026M pixel input port. The RCLK signal must be used as

the timing reference to clock pixel data into this port. Therefore, when SCLK is used, RCLK is typically tied

directly back to LCLK, or LCLK can be a delayed version (buffered) of RCLK within the timing requirements

of the TVP3026M.

Operation using the SCLK timing mode must limit the RCLK-to-LCLK loop delay to the specified maximum

delay. This ensures that the relationship between the end of blanking (SYSBL active) and the first SCLK

pulse is not disturbed. When SCLK is not used, the RCLK-to-SCLK delay can be as long as is needed by

system logic. Figure 2–6 illustrates the frame-buffer timing using SCLK.

2–17

SYSBL

Latch First Group of Pixel Data

Latch Last Group

of Pixel Data

Latch SYSBL

Falling Edge

Latch SYSBL

Rising Edge

LCLK = RCLK

Latch Last Group

of Pixel Data

1st

2nd

3rd

Group Group Group

Last Group of Pixel Data

Last Group

P63–P0

SCLK

Figure 2–6. Frame-Buffer Timing Using SCLK

2.5.4

Split Shift-Register-Transfer Support

When SCLK is used, the TVP3026M supports the special clocking requirements of some VRAM devices.

For example, some VRAM devices require the first SCLK pulse to occur during blanking (SYSBL active)

between the split shift-register transfer (SSRT) and the full shift-register transfer VRAM operations. When

SCLK mode is enabled (TCR5 = 1) and SYSBL is active, a high pulse on the SFLAG input is passed directly

to the SCLK output. When the high pulse on SFLAG is detected at any time during blanking, the first SCLK

pulse normally generated after coming out of blanking is suppressed. This is because the SSRT operation

leaves the first pixel group of the new line on the pixel bus as opposed to the last pixel group of the previous

line. Figure 2–7 shows the SCLK timing mode with the first SCLK pulse relocated. When this function is not

used, the SFLAG terminal should be connected to GND.

SYSBL

Latch First Group

of Pixel Data

LCLK = RCLK

Latch Last Group of Pixel Data

2nd

3rd

4th

Group Group Group

Last

Group

1st Group

P63–P0

SCLK Between Split Shift Register and Full Shift Register Transfer

SCLK

SFLAG

Figure 2–7. Frame-Buffer Timing Using SCLK (With First SCLK Pulse Relocated)

2–18

2.6 Multiplexing Modes of Operation

The TVP3026M offers a highly versatile multiplexing scheme as illustrated in Tables 2–17 through 2–21.

The multiplexing modes allow the pixel bus (P63–P0) to be programmed to 4, 8, 16, 24, or 32 bits/pixel with

pixel bus widths ranging from 8 to 64 bits. The use of on-chip multiplexing allows graphics systems to be

designed that can support multiple pixel depths and resolutions with no hardware modification. The

TVP3026M can also be configured for pseudo-color or true-color operation.

Multiplexing of the pixel bus is controlled by and programmed through the multiplex-control register and the

true-color control register. Table 2–17 details the register settings for each mode of operation.

2.6.1

Little-Endian and Big-Endian Data Format

The TVP3026M pixel bus supports both little- and big-endian data formats for all pseudo-color, direct-color,

and true-color modes of operation. The data-format select is controlled by GCR3 of the general-control

register (see subsection 2.15.1, General Control Registers). When GCR3 is reset 0 (default), the format is

set to little endian. When GCR3 is set to 1, the format is set to big endian.

In a big-endian design, the external VRAM data bus bits must be connected in reverse order to the

TVP3026M pixel bus; i.e., D63 connected to P0, D0 connected to P63, etc. This configuration connects the

pixels to the P63–P0 bus in the correct order with the first pixel to be displayed on the LSBs of the P63–P0

bus. However, theindividualbitswithineachpixelarenowconnectedinbit-reversedorder.Whenbig-endian

format is selected, this bit-reversed order of each pixel is compensated for internally. The bit-reversal of

pixelstakesplaceingroupsof4, 8, 16, or32bitsdependingonthemultiplexingmodeselected. Thisscheme

enables big-endian systems to operate in all of the available color-depths excluding the packed-24 modes.

2.6.2

VGA Modes

The VGA modes emulate the VGA modes of most personal computers. The TVP3026M has a single

configuration called VGA mode 2 to support VGA modes. VGA mode 1, which was formerly specified to

utilize the loop clock PLL with the VGA pixel port, is not recommended.

VGA mode 2 supports most graphics accelerators with integrated VGA and also supports add-on graphics

boards that receive the VGA pseudo-color data from a separate VGA controller using a feature connector.

VGA mode 2 is active at power up and after reset and is fully functional without any software intervention.

VGA data and video controls are received with a synchronous VGA clock.

The feature connector configuration is emulated by many graphics accelerators with integrated VGA. In this

configuration, the pixel clock PLL is output on the RCLK terminal (bit MKC5 = 0) and sent to the accelerator

clock input. The clock output from the accelerator is connected to the CLK0 input of the TVP3026M. The

loop clock PLL is not used. The accelerator outputs the VGA video controls and VGA7–VGA0 data

synchronously with CLK0 and, thereby, emulates the feature connector configuration. In VGA mode 2, the

TVP3026M derives the dot clock from CLK0 and latches the VGA7–VGA0 data and VGA video controls

using CLK0.

To program for VGA mode 2, bit MCR7 in the multiplex-control register must be set to 1 to select VGA mode,

and bit MCR6 must be reset to 0 to latch VGA7–VGA0 and the VGA video controls with CLK0. The clock

selection register bits CSR3–CSR0 must be set as 0111 for CLK0 data latching.

2.6.3

Pseudo-Color Mode

In pseudo-color mode (sometimes called color indexing), the pixel bus inputs address the palette RAM. The

pallete RAM functions as a color look-up table. The data in each RAM location is comprised of 24 bits, 8

bits for each of the red, green, and blue color DACs. The pseudo-color mode is further grouped into 3

submodes, depending on the data bits per pixel. In each submode, a pixel bus width of 8, 16, 32 or 64 bits

can be used. Data should always be presented on the least significant bits of the pixel bus. For example,

when a 16-bit pixel bus width is used, the pixel data must be presented on P15–P0. See Tables 2–17 and

2–18 for more details.

2–19

Submode 1 uses four bit-planes to address the color palette. The four bits are fed into the low-order address

bits of the palette with the four high-order address bits being defined by the palette page register. This mode

provides 16 pages of 16 colors and can be used at multiplex ratios of 2:1 to 16:1.

Submode 2 uses four bit-planes to address the color palette. Each byte of the pixel bus contains two pixels,

which are in reverse order (nibble swapped). The first pixel is latched in on the upper four bits and the second

pixel is latched in on the lower four bits of each byte. The 4-bit pixels are fed into the low-order address bits

of the palette with the four high-order address bits being defined by the palette page register. This mode

provides 16 pages of 16 colors and can be used at multiplex ratios from 2:1 to 16:1.

Submode 3 uses eight bit-planes to address the color palette. Since all eight bits of palette address are

specified from the pixel port, the palette page register is not used. This mode provides 256 colors and can

be used at mulitplex ratios from 1:1 to 8:1.

NOTE

The port select and color-key switching functions must be disabled and set for

palette graphics when in the pseudo-color mode. This is the default condition at

reset. See Section 2.8, Port Select and Color-Key Switching.

2.6.4

Direct-Color Mode

In direct-color mode, 24, 16, 15, or 12 bits of data can be transferred directly to the RGB DACs but with the

same amount of pipeline delay as the overlay data and the control signals. Depending on which direct-color

mode is selected, overlay is provided by utilizing the remaining bits of the pixel bus to address the palette

RAM. This results in a 24-bit RAM output that is then used as overlay information to the DACs. The overlay

capability is designed to work with the port select and color-key switching functions to provide overlay in

specific windows or on a pixel-by-pixel basis on the direct-color display as discussed in Section 2.8, Port

Select and Color-Key Switching. See Table 2–17 for more details on selecting the direct-color modes. See

NOTES in the following section.

Submodes 1 and 2 are packed-24 modes. See subsection 2.6.6, Packed-24 Modes, for a description of the

packed-24 modes.

Submodes 3 and 4 are the 32-bit direct-color modes that use eight bits to represent each color and eight

bits for overlay. The 64-bit-wide pixel bus of the TVP3026M allows multiplex ratios of 1:1 or 2:1. Submode

3 is organized as overlay, red, green, and blue, while submode 4 is organized as blue, green, red, and

overlay.

Submode 5 is the XGA-compatible 5–6–5 (16-bit-color) mode supporting five bits of red, six bits of green,

and five bits of blue data. The TVP3026M supports multiplex ratios for this mode of 1:1, 2:1, and 4:1. Overlay

is not available in this mode.

Submode 6 is the TARGA-compatible 1–5–5–5 mode that uses 15 bits for color and 1 bit for overlay. It

allows 5 bits for each of red, green, and blue data and one bit for overlay. The TVP3026M supports 1:1, 2:1,

and 4:1 multiplex ratios in this mode.

Submode 7 is the 6–6–4 configuration. It provides six bits of red, six bits of green, and four bits of blue. The

TVP3026M supports 1:1, 2:1, and 4:1 multiplexing in this mode. Overlay is not available in this mode.

Submode 8 is the 4–4–4–4 configuration. It provides 12 bits of direct color and 4 bits of overlay. It allows

four bits for each of red, green, and blue data. The TVP3026M supports 1:1, 2:1, and 4:1 multiplexing ratios

in this mode.

2–20

2.6.5

True-Color Mode

In true-color mode, the palette RAM is partitioned into three independent 256-word x 8-bit memory blocks

thatcanbeindividuallyaddressedbyeachcolorfieldofthetrue-colordata. Theindependentmemoryblocks

provide data for a single DAC output. With this architecture, gamma correction for each color is possible.

Since the palette is used in true-color mode, there is no memory space to be used for the overlay function.

All of the true-color submodes are the same as direct color except that overlay is not available. See

Table 2–17 for more details on mode selection, and see the following NOTES.

NOTE:

Since less than 8 bits are defined for each color in the various 12- or 16-bit

direct-color or true-color modes, the data bits for the individual colors are internally

shifted to the MSB locations, and the remaining LSB locations for each color are

set to 0 before 8-bit data is sent to the DACs.

Since the overlay information goes through the pseudo-color data path, it is subject

to read masking and the palette page register. This is especially important for those

direct-color modes that have less than eight bits of overlay information. The overlay

information in these modes justifies to the LSB positions, and the remaining MSB

positions are filled with the corresponding palette page data before addressing the

palette RAM.

In order to display true color (gamma corrected through the palette), the port select

function or the color-key switching function must be set for palette graphics. For

direct color, both functions must be set for direct color.

When in the 24-bit direct-color or true-color modes, the data input works only in the

8-bit mode. In other words, when only six bits are used, the two LSB inputs for each

color need to be tied to GND. However, the palette, which is used by the overlay

input, is still governed by the 8/6 function, and the output multiplexer selects 8 bits

or 6 bits of data accordingly. The 8/6 function is also valid in the other 16-bit modes.

The default condition, after reset, is for the port select function to be disabled and

ready to select palette graphics (MSC4 = MSC5 = 0) The default condition for

the color key function is to be disabled and ready to select direct-color graphics

(CKC4 = CKC3 = CKC2 = CKC1 = CKC0 = 0). The overall effect is to default to

palette graphics since the two are combined by a logical OR function. Also since

MCR7 = 1 at reset, the VGA port is selected.

2.6.6

Packed-24 Mode

The packed-24 mode provides for more efficient use of the frame buffer. For example, a 1280 x 1024 x

24 bpp display can be implemented using 4 Mbytes of VRAM. Without packed-24, this can require 6 or

8 Mbytes of VRAM. Packed-24 modes can be used with direct-color (color palette bypass) or with true-color

(gamma correction). The color depth is 24 bit/pixel and data can be arranged as R-G-B or B-G-R. Overlay

fields are not available. Either a 64-bit pixel bus or a 32-bit pixel bus can be used. The 64-bit pixel bus

supports 8:3 packed-24 (8 pixels per 3 LCLKs) and 5:2 packed-24 (5 pixels per 2 LCLKs). The 32-bit pixel

bus supports 4:3 packed-24 (4 pixels per 3 LCLKs) and 5:4 packed-24 (5 pixels per 4 LCLKs). See Tables

2–19 and 2–20 for data formats.

The loop clock PLL must be set up to generate RCLK at the proper frequency, which can be 3/8, 2/5, 3/4,

or 4/5 of the dot clock frequency for the multiplexing ratios given above. Since the RCLK is PLL-synthesized,

a 50% duty cycle RCLK is generated. As compared to other packed-pixel palette DACs, which generate the

RCLK waveform using a digital state machine, the TVP3026M provides a longer RCLK period for a given

dot clock frequency. This means a higher screen refresh rate is possible using VRAM of the same speed

grade. For example, for the 8:3 packed-24 mode, the RCLK PLL must be set to output a clock that is 3/8

the frequency of the pixel clock. For a 1280 x 1024 display at 135 MHz pixel rate, a 50.6-MHz VRAM serial

clock rate can be used. See subsection 2.4.3, Loop Clock PLL, for a description of the loop clock PLL.

2–21

Packed-24 operation using the SCLK timing mode must limit the RCLK-to-LCLK loop delay to the specified

maximum delay. The following constraints apply to packed-24 mode:

•

The number of LCLKs (pixel bus loads) during the active portion of the horizontal line must be

a multiple of the number of LCLKs for each pixel group, i.e., a multiple of 3 for 8:3 packed-24

mode.

•

The number of LCLKs during the total horizontal line (active + blanked) must be a multiple of the

number of LCLKs for each pixel group.

The first active pixel bus load (LCLK rising edge) of the horizontal line must load the first word

of the M-word sequence comprising the pixel group. For designs not using SCLK

(bit TCR5 = 0), the first active pixel bus load coincides with the first time SYSBL is sampled high.

For designs using SCLK (bit TCR5 = 1), the first active pixel bus load occurs two LCLKs after the

first time SYSBL is sampled high. See Figures 2–5 and 2–6.

Synchronizationofthepacked-24operationisperformedbytheloopclockPLL. ConsideranN:Mpacked-24

mode that packs N pixels into M pixel bus words. Internally, the TVP3026M must run through a sequence

of N dot clocks for each pixel group. The loop clock PLL supplies a clock (RCLK) that is M/N times the dot

clock frequency. The graphics accelerator uses RCLK to generate SYSBL. Initially, SYSBL could change

on any of the M LCLKs of the sequence. Once SYSBL is sampled, the TVP3026M declares the proper LCLK

as the first in the M-word sequence. However, the relationship between LCLK and the internal dot clock has

not been established. Only one LCLK rising edge in the M-word pixel group is aligned with the internal dot

clock, but which one of the M LCLKs is aligned has not been specified. This selection is important for

operation of the unpacking logic and is programmable using the LCLK-edge synchronizer delay. The LCLK

edge synchronizer function allows selection of whichever LCLK edge of the pixel group is aligned with the

internal dot clock. For each packed-24 mode, there is an optimum setting for LES1 and LES0 (see Tables

2–14 and 2–15).

The following steps outline a typical setup procedure for packed-24 mode:

1. Program the pixel clock PLL for the desired dot clock frequency and poll status until the frequency

is locked.

2. Select the pixel clock PLL as clock source in clock selection register.

3. Program the true-color control register and the multiplex-control register as given in Table 2–17.

4. Download palette RAM when gamma correction is being used (true-color mode).

5. Program the latch control register as given in Table 2–27.

6. Set port select and color-key switching functions appropriately. For the true-color mode, select

the palette RAM. This is the power-up default. For direct-color mode, select palette bypass. From

defaults, this can be done by setting bit MSC5 = 1 in the miscellaneous control register.

7. Select the loop clock PLL for output on the RCLK terminal by setting MCLK/loop clock control

register bit MKC5 to 1.

8. Program the loop clock PLL as described in subsection 2.4.3.2, Programming for Packed-24

Modes, and poll status until locked.

2–22

2.6.7

Multiplex Control Registers

The pixel port multiplexer is controlled by two 8-bit registers in the indirect register map (see Table 2–2). The

various multiplexing modes can be selected according to Table 2–17.

NOTE:

ForallmodesutilizingVGA7–VGA0, MCR6shouldbesetto0. WhenMCR6isreset

to 0, VGABL, VGAVS, and VGAHS are used and these video controls and

VGA7–VGA0 are latched by CLK0. This is referred to as VGA mode 2. VGA

mode 2 supports most graphics accelerators with integrated VGA and also

supports add-on graphics boards that receive the VGA pseudo-color data from a

separate VGA controller using a feature connector. VGA mode 2 is active at power

up and after reset, and is fully functional without any software intervention. VGA

data and video controls are received with a synchronous VGA clock.

For all modes, true-color control register bit TCR5 selects one of two timing modes

for the blanking pipelining and pixel bus timing. See Figures 2–5 and 2–6.

When bit TCR5 is set to 0 (default) it is assumed that the VRAM shift clock is

sourced by the graphics accelerator, and that SCLK from the TVP3026M is not

being used. In this case, the first sample of blanking (SYSBL or VGABL) inactive

and the first pixel group latched into P63–P0 are assumed to coincide on the same

rising edge of LCLK.

When bit TCR5 is set to 1, it is assumed that SCLK is used as the VRAM shift clock.

In this case, the TVP3026M must first sample blanking in order to start toggling

SCLK and then latch the first pixel group into P63–P0. Therefore, the TVP3026M

assumes there is a 2-LCLK delay between the first sample of blanking inactive and

the latching of the first pixel group by LCLK. In this case, the TVP3026M inserts

additional pipeline delays to align the internal blanking signal with the pixel data at

the DACs.

It is recommended that all unused input terminals be connected to ground to

conserve power.

2–23

Table 2–17. Multiplex Mode and Bus Width Selection

TRUE-

COLOR-

CONTROL

REGISTER

(INDEX

DATA

BITS

PER

PIXEL

(see

Note 3)

MULTIPLEX-

CONTROL

REGISTER

(INDEX

MULTI-

PLEX

RATIO

(see

OVERLAY

BITS

PER

PIXEL

TABLE

REFERENCE

(see

PIXEL

BUS

WIDTH

SUB-

MODE

Note 5)

0x19)

Note 4)

0x18)

VGA

0x80

0x16

0x1E

0x17

0x1F

0x98

0x41

0x42

0x43

0x44

0x61

0x62

0x63

0x64

0x49

0x4A

0x4B

0x4C

0x5B

0x5C

0x5B

0x5C

0x5B

0x5C

0x5B

0x5C

8

4

8

1

2

NA

v1

s1

1

4

16

32

64

8

4

s2

4-Bit,

Normal

4

8

s3

4

16

2

s4

4

s5

2

4

16

32

64

8

4

s6

Pseudo

Color

4-Bit,

Nibble

Swapped

4

8

s7

4

16

1

s8

8

s9

8

16

32

64

32

64

32

64

32

64

32

64

2

s10

s11

s12

d1

d2

d3

d4

d5

d6

d7

d8

3

8-Bit

8

4

8

24

4:3

8:3

5:4

5:2

4:3

8:3

5:4

5:2

1

Packed-24

R-G-B

8–8–8

2

Packed-24

B-G-R

8–8–8

Direct

Color

3

0x06

0x07

0x5B

0x5C

0x5B

0x5C

24

32

64

32

64

1

2

1

2

8

d9

32-Bit

O-R-G-B

d10

d11

d12

4

32-bit

B-G-R-O

NOTES: 3. Databitsperpixelisthenumberofbitsofpixelinformationusedascolordataforeachdisplayedpixel,often

referred to as the number of bit-planes.

4. Multiplex ratio indicates the number of pixels per bus load or the number of pixels associated with each

LCLK (load clock) pulse. For example, with a 64-bit pixel bus width and 8 bit-planes, each bus load is

comprised of 8 pixels. The RCLK frequency must be chosen as a function of the multiplex mode selected.

The RCLK frequency is not automatically set by mode selection; it must be set by programming the loop

clock PLL registers.

5. This column is a reference to Tables 2–18 through 2–21, where the actual manipulation of pixel information

and pixel latching sequences are illustrated for each of the multiplexing modes. For the pseudo-color pixel

latching sequence (V1 and S1 through S12) refer to Table 2–18. For the packed-24 mode pixel latching

sequence associated with the direct-color and true-color modes, refer to Table 2–19. For the direct-color

mode pixel latching sequence, refer to Table 2–20 for little-endian format and to Table 2–21 for big-endian

format.

2–24

Table 2–17. Multiplex Mode and Bus Width Selection (Continued)

TRUE-

COLOR-

CONTROL

REGISTER

(INDEX

DATA

BITS

PER

PIXEL

(see

Note 3)

MULTIPLEX-

CONTROL

REGISTER

(INDEX

MULTI-

PLEX

RATIO

(see

OVERLAY

BITS

PER

PIXEL

TABLE

REFERENCE

(see

PIXEL

BUS

WIDTH

SUB-

MODE

Note 5)

0x19)

Note 4)

0x18)

5

0x05

0x52

0x53

0x54

16

32

64

1

2

4

NA

d13

d14

d15

16-bit XGA

R-G-B

5–6–5

6

0x04

0x52

0x53

0x54

15

16

32

64

1

2

4

1

d16

d17

d18

16-bit

TARGA

O-R-G-B

1–5–5–5

Direct

Color

7

0x03

0x01

0x52

0x53

0x54

0x52

0x53

0x54

16

12

16

32

64

16

32

64

1

2

4

1

2

4

NA

4

d19

d20

d21

d22

d23

d24

16-bit

R-G-B

6–6–4

8

16-bit

R-G-B-O

4–4–4–4

4

0x56

0x5E

0x57

0x5F

0x5B

0x5C

0x5B

0x5C

0x5B

0x5C

0x5B

0x5C

24

32

64

32

64

32

64

32

64

4:3

8:3

5:4

5:2

4:3

8:3

5:4

5:2

NA

d1

d2

d3

d4

d5

d6

d7

d8

1

Packed-24

R-G-B

8–8–8

2

Packed-24

B-G-R

8–8–8

True

Color

3

0x46

0x47

0x5B

0x5C

0x5B

0x5C

24

32

64

32

64

1

2

1

2

NA

d9

32-Bit

X-R-G-B

d10

d11

d12

4

32-bit

B-G-R-X

NOTES: 3. Databitsperpixelisthenumberofbitsofpixelinformationusedascolordataforeachdisplayedpixel,often

referred to as the number of bit-planes.

4. Multiplex ratio indicates the number of pixels per bus load or the number of pixels associated with each

LCLK (load clock) pulse. For example, with a 64-bit pixel bus width and 8 bit-planes, each bus load is

comprised of 8 pixels. The RCLK frequency must be chosen as a function of the multiplex mode selected.

The RCLK frequency is not automatically set by mode selection; it must be set by programming the loop

clock PLL registers.

5. This column is a reference to Tables 2–18 through 2–21, where the actual manipulation of pixel information

and pixel latching sequences are illustrated for each of the multiplexing modes. For the pseudo-color pixel

latching sequence (V1 and S1 through S12) refer to Table 2–18. For the packed-24 mode pixel latching

sequence associated with the direct-color and true-color modes, refer to Table 2–19. For the direct-color

mode pixel latching sequence, refer to Table 2–20 for little-endian format and to Table 2–21 for big-endian

format.

2–25

Table 2–17. Multiplex Mode and Bus Width Selection (Continued)

TRUE-

COLOR-

CONTROL

REGISTER

(INDEX

DATA

BITS

PER

PIXEL

(see

Note 3)

MULTIPLEX-

CONTROL

REGISTER

(INDEX

MULTI-

PLEX

RATIO

(see

OVERLAY

BITS

PER

PIXEL

TABLE

REFERENCE

(see

PIXEL

BUS

WIDTH

SUB-

MODE

Note 5)

0x19)

Note 4)

0x18)

5

0x45

0x52

0x53

0x54

16

32

64

1

2

4

NA

d13

d14

d15

16-bit XGA

R-G-B

5–6–5

6

0x44

0x52

0x53

0x54

15

16

32

64

1

2

4

NA

d16

d17

d18

16-bit

TARGA

X-R-G-B

1–5–5–5

True-

Color

7

0x43

0x41

0x52

0x53

0x54

0x52

0x53

0x54

16

12

16

32

64

16

32

64

1

2

4

1

2

4

NA

d19

d20

d21

d22

d23

d24

16-bit

R-G-B

6–6–4

8

16-bit

R-G-B-X

4–4–4–4

NOTES: 3. Databitsperpixelisthenumberofbitsofpixelinformationusedascolordataforeachdisplayedpixel,often

referred to as the number of bit-planes.

4. Multiplex ratio indicates the number of pixels per bus load, or the number of pixels associated with each

LCLK (load clock) pulse. For example, with a 64-bit pixel bus width and 8 bit-planes, each bus load is

comprised of 8 pixels. The RCLK frequency must be chosen as a function of the multiplex mode selected.

The RCLK frequency is not automatically set by mode selection; it must be set by programming the loop

clock PLL registers.

5. This column is a reference to Tables 2–18 through 2–21, where the actual manipulation of pixel information

and pixel latching sequences are illustrated for each of the multiplexing modes. For the pseudo-color pixel

latching sequence (V1 and S1 through S12) refer to Table 2–18. For the packed-24 mode pixel latching

sequence associated with the direct-color and true-color modes, refer to Table 2–19. For the direct-color

mode pixel latching sequence, refer to Table 2–20 for little-endian format and to Table 2–21 for big-endian

format.

2–26

Table 2–18. Pseudo-Color Mode Pixel-Latching Sequence (see Note 6)

v1

s1

s2

s3

s4

s5

s6

VGA7–VGA0

P3–P0

P7–P4

P3–P0

P7–P4

P11–P8

P15–P12

P3–P0

P7–P4

P11–P8

•

P3–P0

P7–P4

P11–P8

•

P7–P4

P3–P0

P7–P4

P3–P0

P15–P12

P11–P8

•

P31–P28

P63–P60

s7

s8

s9

s10

s11

s12

P7–P4

P3–P0

P15–P12

P11–P8

•

P7–P4

P3–P0

P15–P12

P11–P8

•

P7–P0

P15–P8

P7–P0

P15–P8

P23–P16

P31–P24

P7–P0

P15–P8

P23–P16

•

P31–P28

P27–P24

P63–P60

P59–P56

P55–P48

P63–P56

NOTE 6: The latching sequence is initiated by a rising edge on LCLK. For modes in which multiple pixels are

latched, the LCLK rising edge latches all the pixels and the pixel clock shifts them out starting with

the lowest-numbered pixel. For example, in pseudo-color submode 1 with a 16-bit pixel bus width,

the rising edge of LCLK latches four pixels and the pixel clock shifts them out in the order P3–P0,

P7–P4, P11–P8, and P15–P12. Note that each line in each entry above represents one pixel.

2–27

Table 2–19. Packed-24 Formats

d1

LCLK

First

P31–P24

B1(7–0)

G2(7–0)

R3(7–0)

d2

P23–P16

R0(7–0)

B2(7–0)

G3(7–0)

P15–P8

G0(7–0)

R1(7–0)

B3(7–0)

P7–P0

B0(7–0)

G1(7–0)

R2(7–0)

Second

Third

LCLK

First

P63–P56 P55–P48

P47–P40

R1(7–0)

G4(7–0)

B7(7–0)

P39–P32

G1(7–0)

B4(7–0)

R6(7–0)

d3

P31–P24

B1(7–0)

R3(7–0)

G6(7–0)

P23–P16

R0(7–0)

G3(7–0)

B6(7–0)

P15–P8

G0(7–0)

B3(7–0)

R5(7–0)

P7–P0

B0(7–0)

R2(7–0)

G5(7–0)

G2(7–0)

B5(7–0)

R7(7–0)

B2(7–0)

R4(7–0)

G7(7–0)

Second

Third

LCLK

First

P31–P24

B1(7–0)

G2(7–0)

R3(7–0)

P23–P16

R0(7–0)

B2(7–0)

G3(7–0)

R4(7–0)

P15–P8

G0(7–0)

R1(7–0)

B3(7–0)

G4(7–0)

P7–P0

B0(7–0)

G1(7–0)

R2(7–0)

B4(7–0)

Second

Third

Fourth

d4

P39–P32

G1(7–0)

B4(7–0)

d5

LCLK

First

P63–P56 P55–P48

P47–P40

R1(7–0)

G4(7–0)

P31–P24

B1(7–0)

R3(7–0)

P23–P16

R0(7–0)

G3(7–0)

P15–P8

G0(7–0)

B3(7–0)

P7–P0

B0(7–0)

R2(7–0)

G2(7–0)

B2(7–0)

R4(7–0)

Second

LCLK

First

P31–P24

R1(7–0)

G2(7–0)

B3(7–0)

P23–P16

B0(7–0)

R2(7–0)

G3(7–0)

P15–P8

G0(7–0)

B1(7–0)

R3(7–0)

P7–P0

R0(7–0)

G1(7–0)

B2(7–0)

Second

Third

d6

P39–P32

G1(7–0)

R4(7–0)

B6(7–0)

d7

LCLK

First

P63–P56 P55–P48

P47–P40

B1(7–0)

G4(7–0)

R7(7–0)

P31–P24

R1(7–0)

B3(7–0)

G6(7–0)

P23–P16

B0(7–0)

G3(7–0)

R6(7–0)

P15–P8

G0(7–0)

R3(7–0)

B5(7–0)

P7–P0

R0(7–0)

B2(7–0)

G5(7–0)

G2(7–0)

R5(7–0)

B7(7–0)

R2(7–0)

B4(7–0)

G7(7–0)

Second

Third

LCLK

First

P31–P24

R1(7–0)

G2(7–0)

B3(7–0)

P23–P16

B0(7–0)

R2(7–0)

G3(7–0)

B4(7–0)

P15–P8

G0(7–0)

B1(7–0)

R3(7–0)

G4(7–0)

P7–P0

R0(7–0)

G1(7–0)

B2(7–0)

R4(7–0)

Second

Third

Fourth

d8

P39–P32

G1(7–0)

R4(7–0)

LCLK

First

P63–P56 P55–P48

P47–P40

B1(7–0)

G4(7–0)

P31–P24

R1(7–0)

B3(7–0)

P23–P16

B0(7–0)

G3(7–0)

P15–P8

G0(7–0)

R3(7–0)

P7–P0

R0(7–0)

B2(7–0)

G2(7–0)

R2(7–0)

B4(7–0)

Second

2–28

Table 2–20. Direct-Color Mode Pixel-Latching Sequence (Little-Endian) (see Note 7)

d9

d10

P31–P24(O), P23–P16(R), P15–P8(G), P7–P0(B)

P63–P56(O), P55–P48(R), P47–P40(G), P39–P32(B)

MSB

LSB MSB

LSB

d11

d12

P31–P24(B), P23–P16(G), P15–P8(R), P7–P0(O)

P63–P56(B), P55–P48(G), P47–P40(R), P39–P32(O)

MSB

LSB MSB

LSB

d13

d14

P15–P11(R), P10–P5(G), P4–P0(B)

P31–P27(R), P26–P21(G), P20–P16(B)

MSB

LSB MSB

LSB

d15

d16

P15–P11(R), P10–P5(G), P4–P0(B)

P31–P27(R), P26–P21(G), P20–P16(B)

P47–P43(R), P42–P37(G), P36–P32(B)

P63–P59(R), P58–P53(G), P52–P48(B)

P15(O), P14–P10(R), P9–P5(G), P4–P0(B)

MSB

LSB MSB

LSB

d17

d18

P15(O), P14–P10(R), P9–P5(G), P4–P0(B)

P31(O), P30–P26(R), P25–P21(G), P20–P16(B)

P47(O), P46–P42(R), P41–P37(G), P36–P32(B)

P63(O), P62–P58(R), P57–P53(G), P52–P48(B)

MSB

LSB MSB

LSB

d19

d20

P15–P10(R), P9–P4(G), P3–P0(B)

P31–P26(R), P25–P20(G), P19–P16(B)

MSB

LSB MSB

LSB

d21

d22

P15–P10(R), P9–P4(G), P3–P0(B)

P31–P26(R), P25–P20(G), P19–P16(B)

P47–P42(R), P41–P36(G), P35–P32(B)

P63–P58(R), P57–P52(G), P12–P48(B)

P15–P12(R), P11–P8(G), P7–P4(B), P3–P0(O)

MSB

LSB MSB

LSB

d23

d24

P15–P12(R), P11–P8(G), P7–P4(B), P3–P0(O)

P31–P28(R), P27–P24(G), P23–P20(B), P19–P16(O) P31–P28(R), P27–P24(G), P23–P20(B), P19–P16(O)

P47–P44(R), P43–P40(G), P39–P36(B), P35–P32(O)

P63–P60(R), P59–P56(G), P55–P52(B), P51–P48(O)

MSB

LSB MSB

LSB

NOTE 7: The latching sequence is initiated by a rising edge on LCLK. For modes in which multiple pixels are latched

on one LCLK rising edge, the pixel clock shifts them out starting with the low-numbered pixel. Each line of each

table entry above represents one pixel. In the table, P31–P24(B) means P31 = BLUE7 (MSB), P30 = BLUE6,

. . ., P24 = BLUE0 (LSB). True-color modes are similar, but the overlay fields are not supported.

2–29

Table 2–21. Direct-Color Mode Pixel-Latching Sequence (Big-Endian) (see Note 8)

d9

d10

P31–P24(B), P23–P16(G), P15–P8(R), P7–P0(O)

P63–P56(B), P55–P48(G), P47–P40(R), P39–P32(O)

LSB

MSB LSB

MSB

d11

d12

P31–P24(O), P23–P16(R), P15–P8(G), P7–P0(B)

P63–P56(O), P55–P48(R), P47–P40(G), P39–P32(B)

LSB

MSB LSB

MSB

d13

d14

P15–P11(B), P10–P5(G), P4–P0(R)

P15 – P11(B), P10 – P5(G), P4 – P0(R)

P31 – P27(B), P26 – P21(G), P20 – P16(R)

LSB

MSB LSB

MSB

d15

d16

P15 – P11(B), P10 – P5(G), P4 – P0(R)

P31 – P27(B), P26 – P21(G), P20 – P16(R)

P47 – P43(B), P42 – P37(G), P36 – P32(R)

P63 – P59(B), P58 – P53(G), P52 – P48(R)

P15 – P11(B),P10 – P6(G),P5 – P1(R),P0(O)

LSB

MSB LSB

MSB

d17

d18

P15 – P11(B), P10 – P6(G), P5 – P1(R), P0(O)

P15 – 11(B), P10 – P6(G), P5 – P1(R), P0(O)

P31 – P27(B), P26 – P22(G), P21 – P17(R), P16(O)

P47 – P43(B), P42 – P38(G), P37 – P33(R), P32(O)

P63 – P59(B), P58 – P54(G), P53 – P49(R), P48(O)

LSB

MSB LSB

MSB

d19

d20

P15 – P12(B), P11 – P6(G), P5 – P0(R)

P31 – P28(B), P27 – P22(G), P21 – P16(R)

LSB

MSB LSB

MSB

d21

d22

P15 – P12(B), P11 – P6(G), P5 – P0(R)

P31 – P28(B), P27 – P22(G), P21 – P16(R)

P47 – P44(B), P43 – P38(G), P37 – P32(R)

P63 – P60(B), P59 – P54(G), P53 – P48(R)

P15 – P12(O), P11 – P8(B), P7 – P4(G), P3 – P0(R)

LSB

MSB LSB

MSB

d23

d24

P15 – P12(O), P11 – P8(B), P7 – P4(G), P3 – P0(R)

P31–P28(O),P27– P24(B),P23 – P20(G),P19 – P16(R) P31–P28(O), P27–P24(B), P23–P20(G), P19–P16(R)

P47–P44(O), P43–P40(B), P39–P36(G), P35–P32(R)

P63–P60(O), P59–P56(B), P55–P52(G), P51–P48(R)

LSB

MSB LSB

MSB

NOTE 8: The latching sequence is the same as little-endian. Each line represents one pixel. The table assumes that

the pixel bus has been externally reverse wired. Therefore, P31–P24(B) in the table means P31 = BLUE0

(LSB), P30 = BLUE1, . . . ., P24 = BLUE7 (MSB). True-color modes are similar, but overlay fields are not

supported.

2–30

2.7 On-Chip Cursor

The TVP3026M has an on-chip three-color 64x64 pixel user-definable cursor. The cursor operation defaults

to the XGA standard, but X-windows and three-color modes are also available (see subsection 2.7.3,

Three-Color 64 X 64 Cursor). The cursor operates in both noninterlaced and interlaced modes.

The pattern for the 64 x 64 cursor is provided by the cursor RAM, which can be accessed by the MPU at

any time. Cursor positioning is performed using the cursor position (x,y) registers (see register bit definitions

in subsection 2.15.5, Cursor Position-(x,y) Registers). Positions x and y are defined in the TVP3026M

increasing from left to right and from top to bottom, respectively, as seen on the display screen.

On-chip cursor control is performed by the indirect cursor-control register (index: 0x06). The direct cursor

control register provides an alternate means of enabling and disabling the cursor and selecting the cursor

mode. See the cursor-control register bit definitions in subsection 2.15.3, Indirect Cursor Control Register,

and subsection 2.15.4, Direct Cursor-Control Register, for more details.

2.7.1

Cursor RAM

The 64 x 64 x 2 cursor RAM defines the pixel pattern within the 64x64 pixel cursor window. It is not initialized

and can be written to or read by the MPU at any time, even when the cursor is enabled.

The cursor RAM address zero is at the top left corner of the RAM as shown in Figure 2–8. The 0 bits for the

entire cursor array (associated with the cursor plane) cursor plane are stored in the first 512 bytes of the

RAM, and the 1 bits for the entire cursor array are stored in the last 512 bytes of the RAM. Information for

eight cursor pixels is stored in each byte. The MSB (D7) corresponds with the first or leftmost pixel displayed

on the screen.

The64x64x2cursorRAMstoresatotalof8192bitsandisaccessedthroughthe8-bitMPUdatabus. There

are, therefore, 1024 bytes stored in the RAM and a 10-bit address is used. The upper two bits of the cursor

RAM address (A9, A8) are written to cursor control register (CCR) (index: 0x06) bits CCR3 and CCR2. The

MSB of the address (CCR3) selects cursor plane 0 or cursor plane 1. The lower eight bits of the cursor RAM

address (A7–A0) are written to the cursor RAM write address register (direct register: 0000) for writing to

the RAM and to the cursor RAM read address register (direct register: 0011) for reading the RAM. Then the

plane 0 or 1 data for the first eight pixels is written to the cursor RAM data register (direct register: 1011).

This stores the cursor pixel data in the cursor RAM and automatically increments the cursor RAM address

register. The upper two bits of the cursor RAM address also increment when the lower eight bits roll over

from 0xFF to 0x00. A second write to the cursor RAM data register loads the plane 0 or 1 data for the next

eight cursor pixels, and so on. Update of the entire cursor RAM requires 1024 writes to the cursor RAM data

register.

To read from the cursor RAM, the address of the first cursor RAM location to be read is loaded using CCR3

and CCR2 and the cursor RAM read address register. Then a read is performed on the cursor RAM data

register (direct register: 1011), which reads the plane 0 or 1 data for eight consecutive pixels. Similar to the

cursor RAM write operation, when the read is completed, CCR3 and CCR2 and the cursor RAM address

register are automatically incremented and further reads are made to successive cursor RAM locations.

Upload of the entire cursor RAM requires 1024 reads of the cursor RAM data register.

NOTES

The cursor RAM upper address bits CCR3 and CCR2 in the cursor control register

default to zeros after reset. Since software normally sets these bits to 0s before

accessing the cursor RAM, it can not be necessary to write to CCR3 and CCR2.

Internally, the entire 10-bit address is loaded into the address counter after a write

to the cursor RAM address register (direct register, 0000 or 0011), so CCR3 and

CCR2 should be written first if they are to be changed.

Verticalretraceisdeterminedbydetecting2048or4096pixelclocksbetweenrising

edges of the internal Blank signal. CCR4 selects 2048 when reset to 0 and 4096

when set to 1.

2–31

CURSOR PLANE 0

Upper Left Corner of Cursor as

Displayed on Screen

64

Pixels

Byte 000

Byte 008

Byte 001

Byte 009

. . . . . . . .

Byte 007

Byte 00F

.

64

Pixels

Byte 1F8

Byte 1F9

8 Pixels

. . . . . . . .

Byte 1FF

D7 D6 D5 D4 D3 D2 D1 D0

First Displayed Pixel

(Leftmost)

CURSOR PLANE 1

Upper Left Corner of Cursor as

Displayed on Screen

64

Pixels

Byte 200

Byte 208

Byte 201

Byte 209

. . . . . . . .

Byte 207

Byte 20F

.

64

Pixels

Byte 3F8

Byte 3F9

8 Pixels

. . . . . . . .

Byte 3FF

D7 D6 D5 D4 D3 D2 D1 D0

First Displayed Pixel

(Leftmost)

Figure 2–8. Cursor RAM Organization

2.7.2

Cursor Positioning

The cursor position (x,y) registers position the 64 x 64 cursor on the display screen. The cursor position (x,y)

registers specify the location of the cursor bottom right corner on the display screen relative to the end of

the internal Blank signal. Figure 2–9 shows the orientation of the x,y coordinates for positioning the cursor.

The values written to the cursor position registers represent the position of the bottom right corner of the

cursor. When zero is written to the cursor position x or cursor position y registers, the cursor is off the screen.

When the cursor position (x,y) is (1,1), only a single pixel of the cursor (cursor 63,63)is displayed and it

appears at the upper left corner of the screen.

2–32

When the upper left corner of the cursor is preferred as a reference, determine the screen (x,y) coordinate

where cursor (0,0) is to be positioned. Then add 64 (0x40) to the x coordinate and add 64 (0x40) to the y

coordinate and write these values to the cursor position (x,y) registers. For example, when the upper left

corner of the cursor is to be positioned at screen (0,0), write (0x40, 0x40) to the cursor (x, y) registers.

Blank

X

Screen (0,0)

Cursor (0,0)

Y

64 × 64 Cursor Area

Cursor Position (X, Y)

Active Display Area

Cursor Position (X,Y) = Screen (X,Y) Where Cursor (0,0) is Located + (64,64)

Figure 2–9. Cursor Positioning

Three-Color 64 x 64 Cursor

2.7.3

The 64 x 64 x 2 cursor RAM provides two bits of cursor information on every dot clock cycle during the

64 x 64 cursor window. CCR1 and CCR0 specifiy whether the XGA mode (10) or X-window mode

(11) or three-color mode (01) interprets the cursor information. When CCR1 and CCR0 are 00, the cursor

is disabled. The cursor enable/disable and mode select can also be programmed using the direct cursor

control register. The two bits of cursor pixel data determine the cursor appearance as shown in Table 2-22.

Table 2–22. Cursor RAM Vs. Color Selection

RAM

COLOR SELECTION

XGA MODE

PLANE 1

PLANE 0

THREE-COLOR

MODE

X-WINDOW MODE

0

1

0

1

0

1

Transparent

Cursor color 0

Cursor color 1

Transparent

Complement

Transparent

Cursor color 0

Cursor color 1

Cursor color 0

Cursor color 1

Cursor color 2

Cursor color 0, 1, and 3: These colors are set by writing to the cursor color registers.

Transparent: The underlying pixel color is displayed.

Complement: The 1s complement of the underlying pixel color is displayed.

2–33

2.7.4

Interlaced Cursor Operation

The cursor supports an interlaced display when bit CCR5 in the cursor control register is set to 1. For the

purposes of this discussion assume that the interlaced display consists of an even field of scan lines

numbered 0, 2, 4, . . ., etc., and an odd field of scan lines numbered 1, 3, 5, . . ., etc. Scan line 0 is the first

scan line at the top of the display. When interlaced mode is enabled and cursor position y (CPy) is greater

than 64 (0x40) and less than or equal to 4095 (0xFFF), the first cursor line displayed depends on the state

of the ODD/EVEN terminal and value of CPy.

When CPy is an even number, the data in row 0 of the cursor RAM array is displayed during the even field

(ODD/EVEN = 0), followed by rows 2, 4, . . ., 62 on successive scan lines. The data in row 1 of the cursor

RAM array is displayed during the odd field (ODD/EVEN = 1), followed by rows 3, 5, . . ., 63 on successive

scan lines.

When CPy is an odd number, the data in row 0 of the cursor RAM array is displayed during the odd field

(ODD/EVEN = 1), followed by rows 2, 4, . . ., 62 on successive scan lines. The data in row 1 of the cursor

RAM array is displayed during the even field (ODD/EVEN = 0), followed by rows 3, 5, . . ., 63 on successive

scan lines.

When CPy is between 0 and 64 (0x40), the cursor is partially off the top of the screen. In this case, the data

in the first displayed row of the cursor RAM (row N) is always displayed on scan line 0, which is the first scan

line of the even field, followed by rows N + 2, N + 4, . . ., etc. on successive scan lines. The data in row

N + 1 is displayed on scan line 1, which is the first scan line of the odd field, followed by cursor rows

N + 3, N + 5, . . ., etc. on successive scan lines.

The CCR6 bit of the cursor control register allows the polarity of the received ODD/EVEN signal to be

inverted when set to 1.

2.8 Port-Select and Color-Key Switching

TheTVP3026Mprovidestwointegratedmechanismsforswitchingbetweendirect-colorimagesandoverlay

graphics or between direct-color images and gamma-corrected true-color images midscreen. The port

select function utilizes the external PSEL terminal to enable the display of multiple true-color or overlay and

direct-color on screen. The color-key switching function combines images on screen based on color

comparison with stored color range registers.

The port select function is controlled by the miscellaneous control register (index: 0x1E, see subsection

2.15.2, Miscellaneous Control Register, for register bit definitions). For switching between direct-color and

true-color, a true-color mode must be selected from Table 2–17. For switching between direct-color and

overlay, a direct-color mode must be selected from Table 2–17 and the VGA port must be disabled (MCR7

= 0). Overlay switching is not supported for those direct-color modes that do not have overlay capability. In

all cases, the color-key switching function should be disabled and direct-color (CKC4 = CKC3 = CKC2 =

CKC1=CKC0=0)selected. Themiscellaneouscontrolregisterenablestheport-selectfunctionanddefines

the polarity of PSEL. Since PSEL is sampled with LCLK, the granularity for port-select switching depends

on the number of pixels loaded for each LCLK.

The color-key switching function is controlled by the color-key-control register (index: 0x38, see subsection

2.15.7, Color-KeyControlRegister, forregisterdefinition). Forswitchingbetweendirect-colorandtrue-color,

a true-color mode must be selected from Table 2–17. The incoming red, green, and blue color fields are

comparedwiththeirrespectivecolorrangeregistersbeforegammacorrectionoccurs. Theoverlayterminals

could also be used for the color comparison, although the overlay information is not displayable in true-color

mode. Forswitchingbetweendirect-colorandoverlay, adirectcolormodemustbeselectedfromTable2–17

and the VGA port must be disabled (MCR7 = 0). In all cases, the port-select function should be disabled

and direct-color(MSC5 = 1, MSC4 = 0) selected. The color-key control register enables/disables the red,

green, blue, and/or overlay range comparators and defines the polarity of the color-key switching function.

The comparison values are then written to the eight 8-bit color-key-range registers; color-key overlay (low,

high), color-key red (low, high), color-key green (low, high), and color-key blue (low, high). These registers

are accessed through index 0x30 to index 0x37. The granularity for color-key switching is on a pixel-by-pixel

basis.

2–34

The port select and color-key functions are integrated like a logical OR function. When either of the functions

switches to palette graphics (true-color or overlay through the palette RAM), palette graphics are displayed

instead of direct color. Therefore, when programming the device for any direct-color mode, both the

color-key control and miscellaneous control registers must be set so that direct-color graphics is displayed.

For true color, gamma corrected through the palette, one of the functions must be set to palette graphics.

2.8.1

Port-Select Switching

The port-select switching function is governed by the following equation:

SWITCH = (PSEL × MSC4) MSC5

where:

(11)

MSCn is the nth bit of the miscellaneous control register.

Table 2-23 then applies:

Table 2–23. Port-Select Switching

DISPLAY RESULT

MULTIPLEX MODE SELECTED

SWITCH = 0

Direct-color

SWITCH = 1

Overlay

Direct-color with overlay

Direct-color with true-color

True-color

NOTE:

The DAC output is undefined if SWITCH = 1 when doing overlay switching in a

direct-color mode that does not have overlay capability.

Miscellaneous control register bits MSC5 and MSC4 enable or disable the port

select function and select the polarity, as shown in the equation above. When

port-select switching is disabled (MSC4 = 0), MSC5 sets the port-select function

to either palette graphics (MSC5 = 0, default) or direct-color graphics (MSC5 = 1).

The device supports port-select switching when using multiplexing modes.

However, caution must be observed when using the port-select function with the

multiplexingmodesotherthan1:1, sincethePSELsignalislatchedonLCLK(same

as the pixel port). Port-select switching on a pixel basis with multiplexing modes

other than 1:1 can be accomplished using the color-key switching function by

supplying multiple PSEL signals, one per pixel, into the available overlay terminals.

2.8.2

Color-Key Switching

The TVP3026M supports color-key-switching modes in which color data from the direct-color and overlay

ports is compared to a set of user-definable color-key registers. Based on the outcome of the comparison,

either direct-color, true-color, or overlay, is displayed. High and low color-key registers are provided for each

colorandoverlaysothatrangesofcolorscanbecomparedasopposedtoasinglecolorvalue. Thecolor-key

function is controlled by the color-key-control register bits CKC0–CKC4accordingtothefollowingequation:

COLOR–KEY = [(OL + CKC0) × (R + CKC1) × (G + CKC2) × (B + CKC3)] CKC4

(12)

where: OL = 1 if color-key OL low

≤ overlay (Note 17)

≤ direct color (RED)

≤ color-key OL high

≤ color-key red high

≤ color-key green high

≤ color-key blue high

R = 1

G = 1

B = 1

if color-key red low

if color-key green low ≤ direct color (GREEN)

if color-key blue low ≤ direct color (BLUE)

then

if COLOR–KEY = 1, overlay or true-color is displayed.

if COLOR–KEY = 0, direct-color is displayed.

2–35

NOTE:

CKC0–CKC3 can individually enable or disable certain colors in the comparison

for maximum flexibility. When color-key switching is not desired, CKC0–CKC3

should be set to 0. CKC4 then sets the default for either direct color or palette

graphics. The default condition at reset is CKC0 = CKC1 = CKC2 = CKC3 = CKC4

= 0. This causes the color-key function to default to direct-color graphics.

Thecolor-keycomparisonfortheoverlaydataisperformedafterthereadmaskand

palette page registers so that an 8-bit comparison can be performed. This also

gives the maximum flexibility to the user in performing the color comparisons. If the

overlay defined for a given mode is less than 8 bits per pixel, the data is shifted to

the LSB locations and the palette page register (index: 0x1C) fills the remaining

MSB positions.

For those direct-color modes that have less than 8 bits for each pixel of red, green,

and blue direct-color data, the data internally shifts to the MSB positions for each

color and the remaining LSB bits are filled with zeros before the 8-bit comparisons

are performed.

2.9 Overscan Border

The TVP3026M provides the capability to produce a custom screen border using the overscan function. The

overscan function is enabled by the general control register bit GCR6. The overscan color is user-

programmable by loading the overscan color red, green, and blue registers (see subsection 2.1.4, Cursor

and Overscan Color Registers).

When the overscan function is enabled (GCR6 = 1), then the overscan color is displayed any time that OVS

is high and Blank is low (active). The blanking pedestal is imposed on the analog outputs when both OVS

and Blank are low. When overscan is disabled, then the blanking pedestal occurs whenever Blank is low.

The OVS terminal is always sampled on LCLK. Therefore, overscan can only be used with the VGA port

inVGAmode1(MSC6=1inthemultiplexcontrolregister). ThisselectsSYSBL, SYSHS, SYSVS, andLCLK

latching of the VGA port.

Figure 2–10 demonstrates the use of OVS to produce a custom overscan screen border.

2–36

OVS

Blank

Display Area

Overscan Border

Figure 2–10. Overscan Border

2.10 Horizontal Zooming

The TVP3026M supports a user-programmable horizontal zooming function of 2×, 4×, 8×, 16×, or 32×.

Zooming is controlled through the CKC5–CKC7 bits of the color-key control register (index: 0x38, see

subsection 2.15.7, Color-Key Control Register, for the color-key control register definition).

Whenoneofthehorizontalzoomfactors(otherthan1×)ischosen, theinternalpixelmultiplexerisconfigured

so that it replicates the pixel data on successive dot clocks by the number of times specified by

CKC5–CKC7. Also, the RCLK frequency must be modified by changing the loop clock PLL registers to load

pixel data at the new reduced rate. The new RCLK frequency should be chosen as the old RCLK frequency

divided by the zoom factor.

The horizontal zoom function applies only to the pixel port (P63–P0) data. VGA data cannot be zoomed.

The maximum zoom factor for all packed-24 modes is 8×. When zooming in 5:4 packed-24 mode, the latch

control register setting depends on the zoom factor as described in subsection 2.15.6, Latch-Control

Register.

2.11 Test Functions

The TVP3026M provides several functions that enable system testing and verification. These are detailed

in subsection 2.11.1, 16-Bit CRC, through subsection 2.11.4, Silicon Revision.

2.11.1 16-Bit CRC

A 16-bit cyclic redundancy check (CRC) is provided so that video data integrity can be verified at the input

totheDACs. TheCRCisupdatedwhentwoconsecutivehorizontalsync(HSYNC)pulsesaredetectedwhile

blanking is active (vertical retrace). For the use of the CRC function, HSYNC must be active low at the input

to the TVP3026M. The CRC is only calculated on the active screen area (i.e., active blanking stops the

calculation). One complete vertical screen must be completed to generate a valid CRC.

The CRC can be performed on any of the 24 data lines that enter the DACs and is controlled by the CRC

bit select register (index: 0x3E). Values from 0 to 23 (0x17) can be written to this register to select between

2–37

the 24 different DAC data inputs. The 16-bit remainder that is calculated on the individual DAC data line can

be read from the CRC remainder LSB and CRC remainder MSB registers. See subsection 2.15.9, CRC

Remainder LSB and MSB Registers, and subsection 2.15.10, CRC Bit-Select Register, for the CRC register

bit definitions.

As long as the display pattern for each screen remains fixed, the CRC result should remain constant. When

the CRC result changes, an error condition should be assumed. The CRC is calculated using the algorithm

depicted by the circuit in Figure 2–11. The user can calculate and store the CRC remainder for a test screen

in software and compare this to the TVP3026M calculated CRC remainder to verify data integrity.

LSB

MSB

DATAIN

Q0

D Q

15

D Q

14

D Q

13

DQ

12

DQ

11

DQ

10

DQ

9

DQ

8

DQ

7

DQ

6

DQ

5

DQ

4

DQ

3

D Q

2

D Q

1

D Q

0

Figure 2–11. CRC Algorithm

2.11.2 Sense Comparator Output and Test Register

The TVP3026M provides a SENSE output to support system diagnostics. SENSE can determine the

presence of the CRT monitor or verify that the RGB termination is correct. SENSE is reset to 0 when one

or more of the DAC outputs exceeds the internal comparator voltage of 350 mV. The internal 350-mV

reference has a tolerance of ±50 mV when using an external 1.235-V reference. When the internal voltage

reference is used, the tolerance is higher.

The sense comparators are also integrated with the sense test register (index: 0x3A) so that the comparison

results for the red, green, and blue comparators can be read independently through the 8-bit microinterface.

When the sense test register (STR) is read, the results are indicated in the bit positions of Table 2-24.

Table 2–24. Sense Test Register Results

INDEX: 0x3A, ACCESS: R/W, DEFAULT: UNINITIALIZED

STR BITS

D7

D6

D5

D4

D3

D2

D1

D0

Data

DIS

0

R

G

B

where: R = set to 1 if IOR > 350 mV

G = set to 1 if IOG > 350 mV

B = set to 1 if IOB > 350 mV

D6 – D3 are reserved

D7 is disable (set to 1) bit

NOTE

D7 can be set to 1 to disable the sense comparison function. At reset, the sense

comparison is enabled (D7 = 0). D6–D3 are reserved. When this register is written

to bits D6–D0 need to be reset 0, to disable the sense comparator function.

Both the SENSE output and the sense test register are latched by the falling edge

of the internally sampled blank signal (SYSBL or VGABL depending on bit MCR6).

In order to have stable voltage inputs to the comparators, the frame-buffer inputs

should be set such that data entering the DACs remains unchanged for a sufficient

period of time prior to and after the Blank signal falling edge.

2.11.3 Identification Code

An ID register with a hardwired code is provided that can be used as a software identification of the device

fordifferentversionsofthesystemdesign. TheIDregisterisreadonlythroughindex0x3F. Thevaluedefined

for the TVP3026M is 0x26.

2–38

2.11.4 Silicon Revision

The silicon revision register (index: 0x01) is a read-only register that enables software to identify the silicon

revision of the TVP3026M. On the first pass silicon, this register reads back 0x00. A major revision number

is stored in bits 7–4 and a minor revision number is stored in bits 3–0.

2.12 General-Purpose I/O Registers and Terminals

The general-purpose I/O registers and output terminals provide a means of controlling external functions

through the TVP3026M microinterface. The 8-bit general-purpose I/O data (GI/O) register has five bit

locations (D0–D4) tied to external I/O terminals (GI/O0–GI/O4). The other three bits (D5–D7) can be used

for general data storage and do not affect any other circuitry. The general-purpose I/O data register is

controlled by the general-purpose (GP) I/O control register. GP I/O control register bits IOC0–IOC4 control

whether the corresponding general-purpose I/O terminals are configured as inputs or outputs. The reset

default condition is for GP I/O control register bits IOC0–IOC4 = 0, which configures terminals

GI/O0–GI/O4 as inputs. When any of the GP I/O control register bits are set to 1, the corresponding GI/O

terminals are configured as outputs.

The general-purpose I/O control register, data register, and terminal relationships are shown in Table 2–25.

Table 2–25. General-Purpose I/O Registers

†

DATA BIT

D3

D7

D6

D5

D4

D2

D1

D0

General-purpose I/O control register

Index: 0x2A

Access: R/W

X

IOC4

IOC3

IOC2

IOC1

IOC0

Default: 0x00

General-purpose I/O data register

Index: 0x2B

Access: R/W

X

D4

D3

D2

D1

D0

Default: Uninitialized

General-purpose I/O terminal locations

GI/O4

GI/O3

GI/O2

GI/O1

GI/O0

†

X = do not care

2.13 Reset

There are two ways to reset the TVP3026M. The RESET input terminal can perform a hardware reset.

Alternatively, the device has an integrated software reset function.

A hardware reset is initiated by pulling the RESET input terminal low. When RESET is pulled low all

TVP3026M registers go to default states. This reset is asynchronous, and any glitch on this terminal could

change the intended register setup. The default state at reset is VGA mode, and all default register settings

are given in Table 2–2. When a reset is desired at power up, an external resistor, capacitor, and diode

network can be connected to the RESET terminal. When TTL logic is employed to provide the signal to the

RESET terminal, a pullup resistor should be used to ensure that CMOS levels are achieved.

For a software reset, anytime the reset register (index: 0xFF) is written to, all registers are initialized to

TVP3026M default settings. The data written into the reset register is ignored.

2.14 Analog Output Specifications

The DAC outputs are controlled by three current sources (only two for IOR and IOB) as shown in

Figure 2–12. The default condition is to have 0 IRE difference between blank and black levels, which is

shown in Figure 2–13. When a 7.5-IRE (Institute of Radio Engineers, predecessor to the IEEE) pedestal

is desired, it can be selected by setting bit 4 of the general-control register. This video output is shown in

Figure 2–14.

2–39

A resistor (R

) is needed between the FS ADJUST terminal and GND to control the magnitude of the

SET

full-scale video signal. The IRE relationships in Figures 2–13 and 2–14 are maintained regardless of the

full-scale output current.

The relationship between R

and the full-scale output current IOG is:

SET

R

(Ω) = K1 × V (V)/IOG (mA)

(13)

(14)

SET

ref

The full-scale output current on IOR and IOB for a given R

is:

SET

IOR, IOB (mA) = K2 × V (V)/R

(Ω)

SET

ref

where K1 and K2 are defined as:

IOG

IOR, IOB

PEDESTAL

8-BIT OUTPUT 6-BIT OUTPUT 8-BIT OUTPUT 6-BIT OUTPUT

7.5 IRE

0 IRE

K1 = 11,294

K1 = 10,684

K1 = 11,206

K1 =10,600

K2 = 8,067

K2 = 7,462

K2 = 7,979

K2 = 7,374

AV

DD

IOG

R

C (stray + load)

L

15 pF

SYNC

(IOG Only)

Blank

G0 – G7

Figure 2–12. Equivalent Circuit of the Current Output (IOG)

2–40

Green

[mA]

Red/Blue

[mA] [V]

[V]

White

25.24 0.950 17.62 0.660

100 IRE

40 IRE

Black/

Blank

7.62 0.286 0.00 0.000

Sync

0.00 0.000

NOTEA:75-Ωdoublyterminatedload,V =1.235V, R

on all levels.

=523Ω. RS343A-levelsandtolerancesareassumed

ref

SET

Figure 2–13. Composite Video Output (With 0 IRE, 8-Bit Output)

Green

Red/Blue

[mA] [V]

[mA]

[V]

26.67 1.000 19.05 0.714

White

92.5 IRE

9.05 0.340 1.44 0.054

7.62 0.286 0.00 0.000

Black

Blank

7.5 IRE

40 IRE

Sync

0.00 0.000

NOTEA:75-Ωdoublyterminatedload,V =1.235V, R

on all levels.

=523Ω. RS343A-levelsandtolerancesareassumed

ref

SET

Figure 2–14. Composite Video Output (With 7.5 IRE, 8-Bit Output)

2–41

2.15 Register Definitions

2.15.1 General Control Register (Index: 0x1D, Access: R/W, Default: 0x00)

The general control register definition is listed in Table 2–26.

Table 2–26. General-Control Register

BIT

VALUES

DESCRIPTION

NAME

GCR7

0

Reserved

0: Disable (default)

1: Enable

Overscan enable. GCR6 specifies whether to enable the user-defined

overscan screen border.

GCR6

GCR5

GCR4

0: Disable (default)

1: Enable

Sync enable. Bit GCR5 specifies whether sync information is to be output onto

IOG.

0: 0 IRE (default)

1: 7.5 IRE

Pedestal control. GCR4 specifies whether a 0 or 7.5 IRE blanking pedestal is

to be generated on the video outputs.

0: Little-endian (default)

1: Big-endian

Little-endian/big-endianselect. GCR3 selects either little- or big-endian format

for the pixel-bus interface.

GCR3

GCR2

GCR1

0

Reserved

0: Do not invert (default)

1: Invert

VSYNCOUT output polarity. GCR1 specifies whether vertical sync output is

positive or negative.

0: Do not invert (default)

1: Invert (high)

HSYNCOUT output polarity. GCR0 specifies whether horizontal sync output

is positive or negative.

GCR0

2.15.2 Miscellaneous Control Register (Index: 0x1E, Access: R/W, Default: 0x00)

The miscellaneous control register definition is listed in Table 2–27.

Table 2–27. Miscellaneous Control Register

BIT

VALUES

DESCRIPTION (SEE NOTE 9)

NAME

MSC7

MSC6

0

Reserved

PSEL polarity select. When MSC5 is reset to 0 and setting PSEL to active high

selects direct-color (provided that the color-key function is set to select

direct-color). When MSC5 is set to 1, and then PSEL high selects pseudo-color or

true-color.

0: True function

(default)

MSC5

1: Complementary

0: Disable (default)

1: Enable

Port select switching enable. When MSC4 is set to 1, direct-color/true-color or

direct-color/overlay switching is controlled by the PSEL input. MSC5 controls the

polarity of the PSEL input.

MSC4

MSC3

0: 6-bit (default)

1: 8-bit

8- or 6-bit operation bit. When MSC2 is set to 1, MSCR3 determines 8- or 6-bit

operation.

0: Enable (default)

1: Disable

8/6 terminal disable. When MSC2 is set to 1, the 8/6 terminal is ignored and the

8/6 function is controlled by bit 3 of this register.

MSC2

MSC1

MSC0

0

Reserved

0: Disable (default)

1: Enable

DAC power down. When MSC0 is set to 1, the DACs power down.

NOTE 9: Additional power reduction can be achieved by disabling the internal dot clock by writing the binary value 110

to clock selection register (index: 0x1A) bits 2–0.

2–42

2.15.3 Indirect Cursor Control Register (Index: 0x06, Access: R/W, Default: 0x00)

The indirect cursor control register (CCR) is accessed using the indirect register map. This register provides

for enabling and disabling the cursor and other cursor controls. The cursor mode-select can also be

controlled using the direct cursor-control register. The indirect cursor control register definition is listed in

Table 2–28.

Table 2–28. Indirect Cursor-Control Register

BIT NAME

VALUES

DESCRIPTION

0: Use indirect

CCR (default)

Cursor control register select. CCR7 selects which cursor control register is

used (direct or indirect). The video BIOS must initialize this bit to 1 for driver

software that uses the direct cursor control register.

CCR7

1: Use direct CCR

0: Normal (default)

ODD/EVEN sense invert. When CCR6 is reset to 0, the field indicator

ODD/EVEN used by the hardware cursor in interlaced display mode, is set to

1 for the odd field and is reset to 0 for the even field. When CCR6 is set to 1,

the polarity of ODD/EVEN is the opposite.

CCR6

1: Invert

Enable interlaced cursor. When CCR5 is set to 1, interlaced cursor operation

is enabled. During interlaced cursor operation, the ODD/EVEN terminal

indicates the odd or even field, as determined by value in CCR6.

0: Disable (default)

1: Enable

CCR5

CCR4

0: 2048 pixels

(default)

Vertical blank detection method. Vertical blank is detected using only the blank

signal. The logic detects when there has been either 2048 or 4096 consecutive

dot clocks between rising edges of Blank.

1: 4096 pixels

Cursor RAM address bits 9 and 8. CCR3 is bit 9 and CCR2 is bit 8. These bits

are used with the lower 8 bits of the cursor RAM address supplied by the cursor

RAM address register in the direct register map.

CCR3, CCR2 00: (default)

00: Cursor off

(default)

01: Three-color

cursor

Cursor mode select. CCR1 and CCR0 disable the cursor and select the format

used to interpret the information stored in the cursor RAM when displaying the

cursor. See Table 2–27.

CCR1, CCR0

10: XGA cursor

11: X-windows

cursor

2.15.4 Direct Cursor Control Register (Direct Register: 1001, Access: R/W,

Default: 0x00)

The direct cursor control register is accessed using the direct register map. This register provides an

alternatemeansofenablinganddisablingthecursorandselectingthecursormode. Thisregisterisprovided

for compatibility with commonly used software drivers. The direct cursor-control register definition is listed

in Table 2–29.

Table 2–29. Direct Cursor-Control Register

BIT NAME

DCC7–DCC2 000000

00: Cursor off

VALUES

DESCRIPTION

Reserved

(default)

01: Three color

cursor

Cursor mode select. DCC1 and DCC0 disable the cursor and select the format

used to interpret the information stored in the cursor RAM when displaying the

cursor. See Table 2–27.

DCC1, DCC0

10: XGA cursor

11: X-windows

cursor

2–43

2.15.5 Cursor Position (x, y) Registers (Direct Register: 1100–1111, Access: R/W,

Default: Uninitialized)

These registers specify the (x,y) coordinate of the lower right corner of the cursor, see Table 2-30. All

registers are uninitialized and can be written to or read from by the MPU at any time.

Table 2–30. Cursor Position (X, Y) Registers

CURSOR-POSITION X MSB

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 X1 X0

CURSOR-POSITION X LSB

Data Bit

X Position

0

Direct register 1101

CURSOR-POSITION Y MSB

Direct register 1100

CURSOR-POSITION Y LSB

Data Bit

D7 D6 D5 D4 D3

D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Y Position

0

Y11 Y10 Y9 Y8 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

Direct register 1111 Direct register 1110

The cursor-position x and y values to be written are calculated as follows:

CPx = desired display screen x position for upper left corner of cursor + 0×40

CPy = desired display screen y position for upper left corner of cursor + 0×40

Values from 0 to 4095 (0xFFFh) can be written into the cursor position X and Y registers. The values written

into the cursor position X and Y registers are the screen coordinates for the lower right corner of the cursor.

When zero is written to either the CPx or CPy registers, the cursor is positioned off screen. See subsection

2.7.2, Cursor Positoning.

2–44

2.15.6 Color-Key Control Register (Index 0x38, Access R/W, Default 0x00)

The color-key control register definition is listed in Table 2–31.

Table 2–31. Color-Key Control Register

BIT NAME

VALUES

000: 1× zoom

001: 2× zoom

010: 4× zoom

011: 8× zoom

100: 16× zoom

101: 32× zoom

0: True function

DESCRIPTION

Horizontal zoom factor. When other than 1× zoom is selected, the internal pixel

multiplier is configured so that it loads pixel data at a reduced rate. Also, the

RCLK frequency must be modified to facilitate the new reduced rate. The new

RCLK frequency should be chosen as the old RCLK frequency divided by the

zoom factor. The horizontal zoom function applies only to the pixel port

(P63–P0) data. VGA data cannot be zoomed.

CKC7–CKC5

Color-key-function select. CKC4 controls the polarity of the color-key function.

See equation (12) in subsection 2.8.2, Color-Key Switching.

CKC4

CKC3

1: Complementary

(default)

0: Disable

compare

(default)

Blue-compare enable. CKC3 enables or disables the direct-color blue field

comparison. See equation (12) in subsection 2.8.2, Color-Key Switching.

1: Enable compare

0: Disable

compare

(default)

Green-compare enable. This enables or disables the direct-color green field

comparison. See equation (12) in subsection 2.8.2, Color-Key Switching.

CKC2

CKC1

CKC0

1: Enable compare

0: Disable

compare

(default)

Red-compare enable. This is used to enable or disable the direct-color red field

comparison. See equation (12) in subsection 2.8.2, Color-Key Switching.

1: Enable compare

0: Disable

compare

(default)

Overlay compare enable. This is used to enable or disable the overlay field

comparison. See equation (12) in subsection 2.8.2, Color-Key Switching.

1: Enable compare

2–45

2.15.7 Color-Key (Overlay, Red, Green, Blue) Registers (Index: 0x30–0x37,

Access: R/W, Default: Uninitialized)

These registers specify the color comparison ranges for the four direct-color data fields when performing

color-key switching. A low and a high register are provided for each of the four data fields to facilitate the

range comparison. See subsection 2.8.2, Color-Key Switching, for more details on their usage. There are

eight registers total, two for each color and associated overlay. The formats for both low and high registers

are shown in Table 2-32. Values 0 to 0xFF can be written into the four color-key-low and four color-key-high

registers.

Table 2–32. Color-Key Low and High Registers

COLOR-KEY LOW

Data Bit

D7

L7

D6

L6

D5

L5

D4

L4

D3

L3

D2

L2

D1

L1

D0

L0

Low Value

Index = 0x30, 0x32, 0x34, and 0x36

COLOR-KEY HIGH

Data Bit

D7

H7

D6

H6

D5

H5

D4

H4

D3

H3

D2

H2

D1

H1

D0

H0

High Value

Index = 0x31, 0x33, 0x35, and 0x37

2.15.8 CRC Remainder LSB and MSB Registers (Index: 0x3C–0x3D,

Access: Read Only, Default: Uninitialized)

These registers read the result of the 16-bit CRC calculation (see subsection 2.11.1, 16-Bit CRC). They are

not initialized and can be read by the MPU at any time. The CRC is updated when two consecutive HSYNC

pulses are detected while Blank is active (vertical retrace). The CRC is only calculated on the active screen

area, i.e., active blanking stops the calculation, see Table 2-33. One complete vertical screen must be

completed to generate a valid CRC.

Table 2–33. CRC Remainder LSB and MSB Registers

CRC MSB

D4 D3

CRC LSB

Data Bit

D7

D6

D5

D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

CRC Remainder

R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0

Index = 0x3D Index = 0x3C

2.15.9 CRC Bit Select Register (Index: 0x3E, Access: Write Only,

Default: Uninitialized)

This write-only register specifies which of the 24 DAC data lines the 16-bit CRC should be calculated on (see

subsection 2.11.1, 16-Bit CRC). The register is not initialized and can be written to by the MPU at any time.

The CRC bit select register data format is shown in Table 2-34. Values from 0 to 23 (0x17) can be written

into the register to select the appropriate data line.

Table 2–34. CRC Bit Select Register

BIT NAME

VALUES

DESCRIPTION

BSR7–BSR5 000

Reserved

0x00–0x07: red0–red7

BSR4–BSR0 0x08–0x0F: green0–green7

0x10–0x17: blue0–blue7

CRC control code. BSR4–BSR0 selects one of the 24 DAC input

lines as the input to the CRC calculation.

2–46

3 Electrical Characteristics

3.1 Absolute Maximum Ratings Over Operating Free-Air Temperature Range

†

(unless otherwise noted)

Supply voltage, V

(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

DD

Input voltage range, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V

+ 0.5 V

I

DD

Analog output short-circuit duration to any power supply or common . . . . . . . unlimited

Operating free-air temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C

A

Storage temperature range, T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C

stg

Junction temperature, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175°C

Case temperature for 10 seconds, T : HFG package . . . . . . . . . . . . . . . . . . . . . . . 260°C

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . 260°C

J

C

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These

are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated

under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for

extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to GND.

3.2 Recommended Operating Conditions

MIN

4.75

1.1

NOM

5

MAX

5.25

1.3

UNIT

V

Supply voltages, AV

DD,

DV

DD

Reference voltage, V

ref

1.235

V

High-level input voltage, V

2.4

V

+0.5

DD

0.8

V

IH

Low-level input voltage, V

V

IL

Output load resistance, R

37.5

523

Ω

L

FS ADJUST resistor, R

Ω

SET

XTAL1/XTAL2 crystal frequency

Operating free-air temperature, T

14.31818

MHz

°C

–55

125

A

3–1

3.3 Electrical Characteristics

TEST

CONDITIONS

†

PARAMETER

MIN TYP

MAX

UNIT

V

High-level output voltage

D(7–0), GI/O (4–0), VCLK,

I

= –800 µA

2.4

V

OH

OL

OH

RCLK, SENSE, PCLKOUT,

MCLK

= 3.2 mA

0.4

OL

Low-level output

voltage

V

HSYNCOUT, VSYNCOUT

SCLK

I

= 15 mA

= 18 mA

0.4

0.5

10

–10

1

OL

TTL inputs

V = 2.4 V

I

High-level input

current

I

µA

IH

ECL inputs

V = 4 V

I

TTL inputs

V = 0.8 V

I

Low-level input

current

IL

ECL inputs

V = 0.4 V

I

Pseudo color

True color

I

Supply current

TVP3026M-175

1

A

DD

Direct color

DAC disabled

1

TVP3026M-175

60

mA

µA

Supply current

reduction

DAC and

DOT CLOCK

disabled

350

I

High-impedance-state output current

25

OZ

f = 1 MHz,

V = 2.4 V

I

TTL inputs

Input capacitance

4

C

pF

i

f = 1 MHz,

V = 4 V

I

ECL inputs

Differential input

ECL inputs

voltage

V

0.6

6

–0.5

V

ID

Common-mode

ECL inputs

2.85

3.15 V

DD

IC

input voltage

†

All typical values are at V

= 5 V, T = 25°C.

A

DD

3–2

3.4 Operating Characteristics

PARAMETER

TEST CONDITIONS

8/6 high

MIN

TYP

8

MAX

UNIT

Resolution (each DAC)

bits

8/6 low

8/6 high

8/6 low

8/6 high

8/6 low

6

1

1/4

1

End-point linearity error

(each DAC)

E

LSB

L

Differential linearity error

(each DAC)

D

1/4

5%

20.4

Gray-scale error

White level relative to blank

17.69 19.05

16.74 17.62

mA

White level relative to black

(7.5 IRE only)

18.5

Black level relative to blank

(7.5 IRE only)

0.95

–50

1.44

5

1.9

50

mA

µA

Blank level on IOR, IOB

I

O

Output current (see Note 2)

Blank level on IOG

6.29

7.6

8.96

mA

(with SYNC enabled)

Sync level on IOG (with

SYNC enabled)

–50

5

50

µA

One LSB (8/6 high)

One LSB (8/6 low)

69.1

276.4

2%

µA

DAC-to-DAC matching

DAC-to-DAC crosstalk

Output compliance

5%

–20

dB

V

–0.4

1.2

1.3

Voltage reference output

Output impedance

1.1 1.235

V

z

c

50

13

kΩ

pF

o

Output capacitance

f = 1 MHz,

I

= 0

o

OUT

Sense voltage reference

Clock and data feedthrough

Glitch area (see Note 3)

350

–20

50

mV

dB

pV–s

DOTCLK

periods

Pipeline delay, VGA port

Pipeline delay, pixel port

26

DOTCLK

periods

Lock time

Jitter

5

ms

ps

Pixel clock PLL,

MCLK PLL

200

NOTES: 2. Test conditions for RS343-A video signals (unless otherwise specified): “Recommended Operating

Conditions”,usingexternalvoltagereferenceV =1.235V,R =523Ω.Whenusingtheinternalvoltage

ref SET

reference, R

may need to be adjusted in order to meet these limits.

3. Glitch area does not include clock and data feedthrough. The – 3-dB test bandwidth is twice the clock rate.

SET

3–3

3.5 Timing Requirements (see Note 4)

TVP3026M

-175

UNIT

MIN MAX

175

DOTCLK frequency

Pixel clock PLL

MHz

Internal frequency

175

PCLKOUT frequency

110

MCLK PLL frequency

100

VCO frequency, pixel clock PLL, MCLK PLL, and

loop clock PLL

110

220

85

MHz

CLK0 frequency for VGA mode 2

7.1

5.7

TTL

ECL

t

Clock cycle time

ns

cyc

RCLK

periods

Delay time, RCLK↑ to LCLK↑ (see Note 5)

0.5

d4

t

Setup time, RS3–RS0 valid before RD or WR↓

Hold time, RS3–RS0 valid after RD or WR↓

Setup time, D7–D0valid before WR↑

Hold time, D7–D0valid after WR↑

10

35

0

ns

su1

h1

su2

h2

Setup time, VGA7–VGA0 and VGAHS, VGAVS, and VGABL valid before CLK0↑

Hold time, VGA7–VGA0 and VGAHS, VGAVS, and VGABL valid after CLK0↑

Setup time, P63–P0, VGA7–VGA0, and PSEL valid before LCLK↑

Hold time, P63–P0, VGA7–VGA0, and PSEL valid after LCLK↑

Setup time, SYSHS, SYSVS, and OVS valid before LCLK↑

Hold time, SYSHS, SYSVS, and OVS valid after LCLK↑

Setup time, SYSBL valid before LCLK↑

5

su3

h3

5

su4

h4

2

5

su5

h5

2

5

su6

h6

Hold time, SYSBL valid after LCLK↑

2

Pulse duration, RD or WR low

50

30

3

w1

w2

Pulse duration, RD or WR high

TTL

t

Pulse duration, clock high

ECL

ns

w3

2.5

3

TTL

t

Pulse duration, clock low

ECL

ns

w4

2.5

NOTES: 4. TTL input signals are 0 to 3 V with less than 3 ns rise/fall time between the 10% and 90% levels unless

otherwise specified. ECL input signals are V –1.8 V to V –0.8 V with less than 2 ns rise/fall time

DD

between the 20% and 80% levels. For input and output signals, timing reference points are at the 10% and

90% signal levels. Analog output loads are less than 10 pF. D7–D0 output loads are less than 50 pF. All

other output loads are less than 50 pF unless otherwise specified.

5. ThisparameteronlyapplieswhenSCLKisusedastheVRAMshiftclock. WhenSCLKisnotused, thedelay

may be as much as is required by system logic (assuming the loop clock PLL is used to compensate for

the system delay).

3–4

3.6

Switching Characteristics

TVP3026M-175

PARAMETER

UNIT

MIN TYP

MAX

SCLK/RCLK frequency (see Note 6)

VCLK frequency (see Note 6)

85

40

17

MHz

ns

t

Enable time, RD low to D7–D0 valid

Disable time, RD high to D7–D0 disabled

Valid time, D7–D0 valid after RD high

Delay time, RD low to D7–D0 starting to turn on

en1

dis1

v1

ns

5

ns

d1

Delay time, selected input clock high/low to DOTCLK (internal signal)

high/low

t

d2

t

d3

t

d5

7

ns

Delay time, SCLK high/low to RCLK high/low (see Notes 7, 8, and 9)

1

2

4

6

Delay time, RCLK high to IOR/IOG/IOB active (analog output delay

time) (seeNote10)

t

d6

t

d7

t

r

Analog output settling time(seeNote 11)

Delay time, RCLK high to HSYNCOUT and VSYNCOUT valid

Analog output rise time (see Note 12)

Analog output skew

5

9

2

ns

0

2

NOTES: 6. SCLK can drive an output capacitive load up to 60 pF. The worst-case transition time between the 10% and

90% levels is less than 4 ns (typical 3 ns). RCLK and VCLK can drive output capacitive loads up to 15 pF,

with worst case transition times between 10% and 90% levels less than 4 ns (typical 3 ns).

7. The SCLK delay time to RCLK depends on the load that the signals drive. This parameter is measured with

an VCLK = RCLK load of 15 pF and SCLK load of 60 pF.

8. In SCLK mode, RCLK is delayed from SCLK in such a way that when RCLK is connected to LCLK, the

timing is essentially the same as the TLC3407x family of parts.

9. This parameter applies when SCLK is used.

10. Measured from 90% point of rising clock edge to 50% of full-scale transition.

11. Measured from 50% point of full-scale transition to output settling, within ± 1 LSB (settling time does not

include clock and data feedthrough).

12. Measured between 10% and 90% of full-scale transition.

3–5

3.7 Timing Diagrams

t

h1

t

su1

RS3–RS0

Valid

t

w2

w1

RD,WR

D7–D0

t

dis1

en1

Data Out, RD Low

t

d1

t

v1

Data In,

WR Low

D7–D0

t

h2

su2

Figure 3–1. MPU Interface Timing

3–6

t

cyc

t

w4

w3

CLK0–2/2

t

d2

t

d2

DOTCLK

(internal signal)

SCLK

t

d3

t

d3

RCLK

LCLK

t

d4

t

h3

su3

VGA7–VGA0

VGAHS, VGAVS

VGABL

Data

(CLK0 latching)

t

h4

su4

VGA7–VGA0

P63–P0, PSEL

(LCLK latching)

Data

t

, t

t , t

h5 h6

su5 su6

SYSHS, SYSVS

OVS, SYSBL

Data

(LCLK latching)

t

d5

t

d6

IOR, IOG, IOB

t

r

t

d7

HSYNCOUT

VSYNCOUT

Valid

Figure 3–2. Video Input/Output Timing

3–7

3–8

Appendix A

Frequency Synthesis PLL Register Settings

Table A–1 provides a listing of all possible frequency settings that can be used by the pixel clock PLL for

frequency synthesis using the common 14.31818-MHz crystal. The same register settings can be used for

the MCLK PLL provided that the MCLK maximum frequency of 100 MHz is not exceeded. For other

reference frequencies, a similar table can be generated using the PLL equations given in Section 2.4. (A

program for this purpose is available from Texas Instruments.) The constraints used to generate the table

include limits for the VCO frequency and limits for the N-register value.

PLL Architecture

— TVP3026

— 14.318180

— 110.000000

— 220.000000

— 40

Reference Frequency (MHz)

Minimum VCO Frequency (MHz)

Maximum VCO Frequency (MHz)

Minimum N-Register Value (dec)

Maximum N-Register Value (dec)

— 63

Table A–1. PLL Register Settings for 14.31818 MHz Reference

OUTPUT

14.32

14.89

14.91

14.94

14.97

15.00

15.03

15.07

15.11

15.16

15.21

15.27

15.34

15.42

15.46

15.51

15.56

15.62

15.68

15.75

15.83

15.91

16.00

VCO

NREG

BF

A8

A9

AA

AB

AC

AD

AE

AF

B0

B1

B2

B3

B4

A8

B5

AA

B6

AC

B7

AE

B8

B0

MREG

3F

27

PREG

B3

114.55

119.13

119.32

119.53

119.75

120.00

120.27

120.57

120.91

121.28

121.70

122.18

122.73

123.36

123.71

124.09

124.51

124.96

125.45

126.00

126.60

127.27

128.02

28

29

2A

2B

2C

2D

2E

2F

30

31

32

33

26

34

28

35

2A

36

2C

37

2E

A–1

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

16.04

16.11

16.19

16.23

16.27

16.36

16.47

16.52

16.58

16.61

16.70

16.81

16.84

16.92

17.00

17.05

17.18

17.30

17.33

17.39

17.43

17.50

17.57

17.62

17.69

17.73

17.75

17.90

18.05

18.09

18.14

18.22

18.30

18.33

18.41

18.49

18.53

18.61

VCO

NREG

A8

B9

AA

B2

AB

BA

AD

B4

AE

A8

BB

AA

B0

B6

B1

AC

BC

A9

AE

B3

AA

B8

AB

B4

B0

AC

A8

BD

AA

AE

B2

B6

AF

A8

BA

A9

B0

B7

MREG

25

38

27

30

28

39

2A

32

2B

24

3A

26

2D

34

2E

28

3B

24

2A

30

25

36

26

31

2C

27

22

3C

24

29

2E

33

2A

21

38

22

2B

34

PREG

B3

128.29

128.86

129.49

129.82

130.17

130.91

131.73

132.17

132.63

132.87

133.64

134.47

134.76

135.37

136.02

136.36

137.45

138.41

138.66

139.09

139.45

140.00

140.58

140.98

141.50

141.82

142.04

143.18

144.43

144.69

145.09

145.79

146.36

146.62

147.27

147.95

148.24

148.91

A–2

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

18.68

18.72

18.79

18.84

18.87

18.90

19.09

19.30

19.33

19.37

19.43

19.47

19.52

19.59

19.69

19.77

19.83

19.89

19.92

20.05

20.18

20.21

20.28

20.35

20.45

20.54

20.58

20.62

20.68

20.76

20.83

20.88

20.93

21.00

21.06

21.10

21.14

21.17

21.19

VCO

NREG

AA

B4

B1

AE

AB

A8

BE

AA

AD

B0

B3

A8

B6

AE

B9

AC

B4

AF

AA

BC

AB

B0

B5

AE

BA

AA

B1

A8

B8

AD

B6

A9

B4

B2

B0

AE

AC

AA

A8

MREG

23

30

2C

28

24

20

3D

22

26

2A

2E

1F

32

27

36

24

2F

28

21

3A

22

29

30

26

37

20

2A

1D

34

24

31

1E

2E

2B

28

25

22

1F

1C

PREG

B3

149.41

149.79

150.34

150.72

150.99

151.20

152.73

154.39

154.64

154.97

155.45

155.78

156.20

156.75

157.50

158.18

158.60

159.09

159.37

160.36

161.40

161.71

162.27

162.78

163.64

164.35

164.66

164.95

165.45

166.09

166.61

167.05

167.41

168.00

168.45

168.80

169.09

169.33

169.53

A–3

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

21.48

21.76

21.79

21.82

21.85

21.90

21.95

22.03

22.07

22.13

22.19

22.27

22.34

22.37

22.41

22.50

22.61

22.67

22.74

22.78

22.91

23.03

23.07

23.13

23.18

23.27

23.36

23.43

23.48

23.52

23.58

23.62

23.66

23.86

24.05

24.08

24.11

24.16

24.23

VCO

NREG

BF

A8

AA

AC

AE

B0

B2

B4

A9

B6

AD

B8

A8

B1

AA

BA

AE

B5

B0

AB

BC

AA

AF

B4

AC

B9

AE

B6

A8

B3

B0

AD

AA

BE

A8

AB

AE

B1

B4

MREG

3E

1B

1E

21

24

27

2A

2D

1C

30

22

33

1A

28

1D

36

23

2E

26

1E

39

1C

24

2C

1F

34

22

2F

18

2A

25

20

1B

3C

17

1C

21

26

2B

PREG

B3

171.82

174.11

174.31

174.55

174.83

175.19

175.64

176.22

176.59

177.02

177.55

178.18

178.69

178.98

179.29

180.00

180.86

181.36

181.93

182.23

183.27

184.27

184.55

185.03

185.45

186.14

186.89

187.44

187.85

188.18

188.66

189.00

189.25

190.91

192.44

192.64

192.92

193.30

193.85

A–4

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

24.28

24.34

24.43

24.46

24.55

24.63

24.66

24.73

24.82

24.87

24.90

25.06

25.20

25.23

25.27

25.33

25.38

25.45

25.52

25.57

25.62

25.65

25.77

25.91

25.95

26.03

26.11

26.15

26.25

26.35

26.38

26.43

26.49

26.59

26.68

26.73

26.77

26.85

26.92

26.95

VCO

NREG

AA

B7

B0

A9

BA

A8

AF

B6

B2

AE

AA

BD

A8

AC

B0

B4

AB

B8

AA

B3

AE

A9

BC

AC

B1

B6

B0

AA

BB

A8

AE

B4

AD

BA

AB

B2

AA

B9

A8

B0

MREG

1A

30

24

18

35

16

22

2E

27

20

19

3A

15

1C

23

2A

1A

31

18

28

1F

16

38

1B

24

2D

22

17

36

13

1E

29

1C

34

18

25

16

32

12

21

PREG

B3

194.23

194.73

195.40

195.68

196.36

197.02

197.27

197.85

198.55

198.95

199.21

200.45

201.60

201.82

202.14

202.66

203.06

203.64

204.19

204.55

204.98

205.23

206.18

207.27

207.61

208.26

208.88

209.17

210.00

210.76

211.00

211.47

211.91

212.73

213.47

213.82

214.15

214.77

215.35

215.61

A–5

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

27.05

27.13

27.20

27.27

27.33

27.39

27.44

27.49

28.64

29.78

29.83

29.88

29.94

30.00

30.07

30.14

30.23

30.32

30.43

30.55

30.68

30.84

30.93

31.02

31.13

31.24

31.36

31.50

31.65

31.82

32.01

32.07

32.22

32.37

32.45

32.54

32.73

32.93

33.04

33.16

VCO

NREG

B8

AE

B7

AC

B6

AA

B5

A8

BF

A8

A9

AA

AB

AC

AD

AE

AF

B0

B1

B2

B3

B4

A8

B5

AA

B6

AC

B7

AE

B8

B0

A8

B9

AA

B2

AB

BA

AD

B4

AE

MREG

30

1D

2E

19

2C

15

2A

11

PREG

B3

B2

216.36

217.03

217.64

218.18

218.68

219.13

219.55

219.93

114.55

119.13

119.32

119.53

119.75

120.00

120.27

120.57

120.91

121.28

121.70

122.18

122.73

123.36

123.71

124.09

124.51

124.96

125.45

126.00

126.60

127.27

128.02

128.29

128.86

129.49

129.82

130.17

130.91

131.73

132.17

132.63

3F

27

28

29

2A

2B

2C

2D

2E

2F

30

31

32

33

26

34

28

35

2A

36

2C

37

2E

25

38

27

30

28

39

2A

32

2B

A–6

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

33.22

33.41

33.62

33.69

33.84

34.01

34.09

34.36

34.60

34.67

34.77

34.86

35.00

35.14

35.24

35.37

35.45

35.51

35.80

36.11

36.17

36.27

36.45

36.59

36.65

36.82

36.99

37.06

37.23

37.35

37.45

37.59

37.68

37.75

37.80

38.18

38.60

38.66

38.74

38.86

VCO

NREG

A8

BB

AA

B0

B6

B1

AC

BC

A9

AE

B3

AA

B8

AB

B4

B0

AC

A8

BD

AA

AE

B2

B6

AF

A8

BA

A9

B0

B7

AA

B4

B1

AE

AB

A8

BE

AA

AD

B0

B3

MREG

24

3A

26

2D

34

2E

28

3B

24

2A

30

25

36

26

31

2C

27

22

3C

24

29

2E

33

2A

21

38

22

2B

34

23

30

2C

28

24

20

3D

22

26

2A

2E

PREG

B2

132.87

133.64

134.47

134.76

135.37

136.02

136.36

137.45

138.41

138.66

139.09

139.45

140.00

140.58

140.98

141.50

141.82

142.04

143.18

144.43

144.69

145.09

145.79

146.36

146.62

147.27

147.95

148.24

148.91

149.41

149.79

150.34

150.72

150.99

151.20

152.73

154.39

154.64

154.97

155.45

A–7

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

38.95

39.05

39.19

39.37

39.55

39.65

39.77

39.84

40.09

40.35

40.43

40.57

40.69

40.91

41.09

41.16

41.24

41.36

41.52

41.65

41.76

41.85

42.00

42.11

42.20

42.27

42.33

42.38

42.95

43.53

43.58

43.64

43.71

43.80

43.91

44.06

44.15

44.26

44.39

44.55

VCO

NREG

A8

B6

AE

B9

AC

B4

AF

AA

BC

AB

B0

B5

AE

BA

AA

B1

A8

B8

AD

B6

A9

B4

B2

B0

AE

AC

AA

A8

BF

A8

AA

AC

AE

B0

B2

B4

A9

B6

AD

B8

MREG

1F

32

27

36

24

2F

28

21

3A

22

29

30

26

37

20

2A

1D

34

24

31

1E

2E

2B

28

25

22

1F

1C

3E

1B

1E

21

24

27

2A

2D

1C

30

22

33

PREG

B2

155.78

156.20

156.75

157.50

158.18

158.60

159.09

159.37

160.36

161.40

161.71

162.27

162.78

163.64

164.35

164.66

164.95

165.45

166.09

166.61

167.05

167.41

168.00

168.45

168.80

169.09

169.33

169.53

171.82

174.11

174.31

174.55

174.83

175.19

175.64

176.22

176.59

177.02

177.55

178.18

A–8

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

44.67

44.74

44.82

45.00

45.22

45.34

45.48

45.56

45.82

46.07

46.14

46.26

46.36

46.53

46.72

46.86

46.96

47.05

47.17

47.25

47.31

47.73

48.11

48.16

48.23

48.32

48.46

48.56

48.68

48.85

48.92

49.09

49.25

49.32

49.46

49.64

49.74

49.80

50.11

50.40

VCO

NREG

A8

B1

AA

BA

AE

B5

B0

AB

BC

AA

AF

B4

AC

B9

AE

B6

A8

B3

B0

AD

AA

BE

A8

AB

AE

B1

B4

AA

B7

B0

A9

BA

A8

AF

B6

B2

AE

AA

BD

A8

MREG

1A

28

1D

36

23

2E

26

1E

39

1C

24

2C

1F

34

22

2F

18

2A

25

20

1B

3C

17

1C

21

26

2B

1A

30

24

18

35

16

22

2E

27

20

19

3A

15

PREG

B2

178.69

178.98

179.29

180.00

180.86

181.36

181.93

182.23

183.27

184.27

184.55

185.03

185.45

186.14

186.89

187.44

187.85

188.18

188.66

189.00

189.25

190.91

192.44

192.64

192.92

193.30

193.85

194.23

194.73

195.40

195.68

196.36

197.02

197.27

197.85

198.55

198.95

199.21

200.45

201.60

A–9

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

50.45

50.53

50.66

50.76

50.91

51.05

51.14

51.24

51.31

51.55

51.82

51.90

52.07

52.22

52.29

52.50

52.69

52.75

52.87

52.98

53.18

53.37

53.45

53.54

53.69

53.84

53.90

54.09

54.26

54.41

54.55

54.67

54.78

54.89

54.98

57.27

59.56

59.66

59.76

59.88

VCO

NREG

AC

B0

B4

AB

B8

AA

B3

AE

A9

BC

AC

B1

B6

B0

AA

BB

A8

AE

B4

AD

BA

AB

B2

AA

B9

A8

B0

B8

AE

B7

AC

B6

AA

B5

A8

BF

A8

A9

AA

AB

MREG

1C

23

2A

1A

31

18

28

1F

16

38

1B

24

2D

22

17

36

13

1E

29

1C

34

18

25

16

32

12

21

30

1D

2E

19

2C

15

2A

11

PREG

B2

B1

201.82

202.14

202.66

203.06

203.64

204.19

204.55

204.98

205.23

206.18

207.27

207.61

208.26

208.88

209.17

210.00

210.76

211.00

211.47

211.91

212.73

213.47

213.82

214.15

214.77

215.35

215.61

216.36

217.03

217.64

218.18

218.68

219.13

219.55

219.93

114.55

119.13

119.32

119.53

119.75

3F

27

28

29

2A

A–10

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

60.00

60.14

60.29

60.45

60.64

60.85

61.09

61.36

61.68

61.85

62.05

62.25

62.48

62.73

63.00

63.30

63.64

64.01

64.15

64.43

64.74

64.91

65.08

65.45

65.86

66.08

66.32

66.44

66.82

67.23

67.38

67.69

68.01

68.18

68.73

69.20

69.33

69.55

69.72

70.00

VCO

NREG

AC

AD

AE

AF

B0

B1

B2

B3

B4

A8

B5

AA

B6

AC

B7

AE

B8

B0

A8

B9

AA

B2

AB

BA

AD

B4

AE

A8

BB

AA

B0

B6

B1

AC

BC

A9

AE

B3

AA

B8

MREG

2B

2C

2D

2E

2F

30

31

32

33

26

34

28

35

2A

36

2C

37

2E

25

38

27

30

28

39

2A

32

2B

24

3A

26

2D

34

2E

28

3B

24

2A

30

25

36

PREG

B1

120.00

120.27

120.57

120.91

121.28

121.70

122.18

122.73

123.36

123.71

124.09

124.51

124.96

125.45

126.00

126.60

127.27

128.02

128.29

128.86

129.49

129.82

130.17

130.91

131.73

132.17

132.63

132.87

133.64

134.47

134.76

135.37

136.02

136.36

137.45

138.41

138.66

139.09

139.45

140.00

A–11

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

70.29

70.49

70.75

70.91

71.02

71.59

72.21

72.34

72.55

72.89

73.18

73.31

73.64

73.98

74.12

74.45

74.70

74.90

75.17

75.36

75.50

75.60

76.36

77.19

77.32

77.49

77.73

77.89

78.10

78.37

78.75

79.09

79.30

79.55

79.68

80.18

80.70

80.86

81.14

81.39

VCO

NREG

AB

B4

B0

AC

A8

BD

AA

AE

B2

B6

AF

A8

BA

A9

B0

B7

AA

B4

B1

AE

AB

A8

BE

AA

AD

B0

B3

A8

B6

AE

B9

AC

B4

AF

AA

BC

AB

B0

B5

AE

MREG

26

31

2C

27

22

3C

24

29

2E

33

2A

21

38

22

2B

34

23

30

2C

28

24

20

3D

22

26

2A

2E

1F

32

27

36

24

2F

28

21

3A

22

29

30

26

PREG

B1

140.58

140.98

141.50

141.82

142.04

143.18

144.43

144.69

145.09

145.79

146.36

146.62

147.27

147.95

148.24

148.91

149.41

149.79

150.34

150.72

150.99

151.20

152.73

154.39

154.64

154.97

155.45

155.78

156.20

156.75

157.50

158.18

158.60

159.09

159.37

160.36

161.40

161.71

162.27

162.78

A–12

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

81.82

82.17

82.33

82.47

82.73

83.05

83.31

83.52

83.71

84.00

84.22

84.40

84.55

84.66

84.76

85.91

87.05

87.15

87.27

87.42

87.59

87.82

88.11

88.30

88.51

88.77

89.09

89.35

89.49

89.64

90.00

90.43

90.68

90.96

91.12

91.64

92.13

92.27

92.52

92.73

VCO

NREG

BA

AA

B1

A8

B8

AD

B6

A9

B4

B2

B0

AE

AC

AA

A8

BF

A8

AA

AC

AE

B0

B2

B4

A9

B6

AD

B8

A8

B1

AA

BA

AE

B5

B0

AB

BC

AA

AF

B4

AC

MREG

37

20

2A

1D

34

24

31

1E

2E

2B

28

25

22

1F

1C

3E

1B

1E

21

24

27

2A

2D

1C

30

22

33

1A

28

1D

36

23

2E

26

1E

39

1C

24

2C

1F

PREG

B1

163.64

164.35

164.66

164.95

165.45

166.09

166.61

167.05

167.41

168.00

168.45

168.80

169.09

169.33

169.53

171.82

174.11

174.31

174.55

174.83

175.19

175.64

176.22

176.59

177.02

177.55

178.18

178.69

178.98

179.29

180.00

180.86

181.36

181.93

182.23

183.27

184.27

184.55

185.03

185.45

A–13

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

93.07

93.44

93.72

93.93

94.09

94.33

94.50

94.62

95.45

96.22

96.32

96.46

96.65

96.92

97.11

VCO

NREG

B9

AE

B6

A8

B3

B0

AD

AA

BE

A8

AB

AE

B1

B4

AA

B7

B0

A9

BA

A8

AF

B6

B2

AE

AA

BD

A8

AC

B0

B4

AB

B8

AA

B3

AE

A9

BC

AC

B1

B6

MREG

34

22

2F

18

2A

25

20

1B

3C

17

1C

21

26

2B

1A

30

24

18

35

16

22

2E

27

20

19

3A

15

1C

23

2A

1A

31

18

28

1F

16

38

1B

24

2D

PREG

B1

186.14

186.89

187.44

187.85

188.18

188.66

189.00

189.25

190.91

192.44

192.64

192.92

193.30

193.85

194.23

194.73

195.40

195.68

196.36

197.02

197.27

197.85

198.55

198.95

199.21

200.45

201.60

201.82

202.14

202.66

203.06

203.64

204.19

204.55

204.98

205.23

206.18

207.27

207.61

208.26

97.36

97.70

97.84

98.18

98.51

98.64

98.93

99.27

99.47

99.60

100.23

100.80

100.91

101.07

101.33

101.53

101.82

102.09

102.27

102.49

102.61

103.09

103.64

103.81

104.13

A–14

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

104.44

104.58

105.00

105.38

105.50

105.73

105.95

106.36

106.74

106.91

107.08

107.39

107.67

107.81

108.18

108.52

108.82

109.09

109.34

109.57

109.77

109.96

114.55

119.13

119.32

119.53

119.75

120.00

120.27

120.57

120.91

121.28

121.70

122.18

122.73

123.36

123.71

124.09

124.51

124.96

VCO

NREG

B0

AA

BB

A8

AE

B4

AD

BA

AB

B2

AA

B9

A8

B0

B8

AE

B7

AC

B6

AA

B5

A8

BF

A8

A9

AA

AB

AC

AD

AE

AF

B0

B1

B2

B3

B4

A8

B5

AA

B6

MREG

22

17

36

13

1E

29

1C

34

18

25

16

32

12

21

30

1D

2E

19

2C

15

2A

11

PREG

B1

B0

208.88

209.17

210.00

210.76

211.00

211.47

211.91

212.73

213.47

213.82

214.15

214.77

215.35

215.61

216.36

217.03

217.64

218.18

218.68

219.13

219.55

219.93

114.55

119.13

119.32

119.53

119.75

120.00

120.27

120.57

120.91

121.28

121.70

122.18

122.73

123.36

123.71

124.09

124.51

124.96

3F

27

28

29

2A

2B

2C

2D

2E

2F

30

31

32

33

26

34

28

35

A–15

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

125.45

126.00

126.60

127.27

128.02

128.29

128.86

129.49

129.82

130.17

130.91

131.73

132.17

132.63

132.87

133.64

134.47

134.76

135.37

136.02

136.36

137.45

138.41

138.66

139.09

139.45

140.00

140.58

140.98

141.50

141.82

142.04

143.18

144.43

144.69

145.09

145.79

146.36

146.62

VCO

NREG

AC

B7

AE

B8

B0

A8

B9

AA

B2

AB

BA

AD

B4

AE

A8

BB

AA

B0

B6

B1

AC

BC

A9

AE

B3

AA

B8

AB

B4

B0

AC

A8

BD

AA

AE

B2

B6

AF

A8

MREG

2A

36

2C

37

2E

25

38

27

30

28

39

2A

32

2B

24

3A

26

2D

34

2E

28

3B

24

2A

30

25

36

26

31

2C

27

22

3C

24

29

2E

33

2A

21

PREG

B0

125.45

126.00

126.60

127.27

128.02

128.29

128.86

129.49

129.82

130.17

130.91

131.73

132.17

132.63

132.87

133.64

134.47

134.76

135.37

136.02

136.36

137.45

138.41

138.66

139.09

139.45

140.00

140.58

140.98

141.50

141.82

142.04

143.18

144.43

144.69

145.09

145.79

146.36

146.62

A–16

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

147.27

147.95

148.24

148.91

149.41

149.79

150.34

150.72

150.99

151.20

152.73

154.39

154.64

154.97

155.45

155.78

156.20

156.75

157.50

158.18

158.60

159.09

159.37

160.36

161.40

161.71

162.27

162.78

163.64

164.35

164.66

164.95

165.45

166.09

166.61

167.05

167.41

168.00

168.45

VCO

NREG

BA

A9

B0

B7

AA

B4

B1

AE

AB

A8

BE

AA

AD

B0

B3

A8

B6

AE

B9

AC

B4

AF

AA

BC

AB

B0

B5

AE

BA

AA

B1

A8

B8

AD

B6

A9

B4

B2

B0

MREG

38

22

2B

34

23

30

2C

28

24

20

3D

22

26

2A

2E

1F

32

27

36

24

2F

28

21

3A

22

29

30

26

37

20

2A

1D

34

24

31

1E

2E

2B

28

PREG

B0

147.27

147.95

148.24

148.91

149.41

149.79

150.34

150.72

150.99

151.20

152.73

154.39

154.64

154.97

155.45

155.78

156.20

156.75

157.50

158.18

158.60

159.09

159.37

160.36

161.40

161.71

162.27

162.78

163.64

164.35

164.66

164.95

165.45

166.09

166.61

167.05

167.41

168.00

168.45

A–17

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

168.80

169.09

169.33

169.53

171.82

174.11

174.31

174.55

174.83

175.19

175.64

176.22

176.59

177.02

177.55

178.18

178.69

178.98

179.29

180.00

180.86

181.36

181.93

182.23

183.27

184.27

184.55

185.03

185.45

186.14

186.89

187.44

187.85

188.18

188.66

189.00

189.25

190.91

VCO

NREG

AE

AC

AA

A8

BF

A8

AA

AC

AE

B0

B2

B4

A9

B6

AD

B8

A8

B1

AA

BA

AE

B5

B0

AB

BC

AA

AF

B4

AC

B9

AE

B6

A8

B3

B0

AD

AA

BE

MREG

25

22

1F

1C

3E

1B

1E

21

24

27

2A

2D

1C

30

22

33

1A

28

1D

36

23

2E

26

1E

39

1C

24

2C

1F

34

22

2F

18

2A

25

20

1B

3C

PREG

B0

168.80

169.09

169.33

169.53

171.82

174.11

174.31

174.55

174.83

175.19

175.64

176.22

176.59

177.02

177.55

178.18

178.69

178.98

179.29

180.00

180.86

181.36

181.93

182.23

183.27

184.27

184.55

185.03

185.45

186.14

186.89

187.44

187.85

188.18

188.66

189.00

189.25

190.91

A–18

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

192.44

192.64

192.92

193.30

193.85

194.23

194.73

195.40

195.68

196.36

197.02

197.27

197.85

198.55

198.95

199.21

200.45

201.60

201.82

202.14

202.66

203.06

203.64

204.19

204.55

204.98

205.23

206.18

207.27

207.61

208.26

208.88

209.17

210.00

210.76

211.00

211.47

211.91

212.73

213.47

VCO

NREG

A8

AB

AE

B1

B4

AA

B7

B0

A9

BA

A8

AF

B6

B2

AE

AA

BD

A8

AC

B0

B4

AB

B8

AA

B3

AE

A9

BC

AC

B1

B6

B0

AA

BB

A8

AE

B4

AD

BA

AB

MREG

17

1C

21

26

2B

1A

30

24

18

35

16

22

2E

27

20

19

3A

15

1C

23

2A

1A

31

18

28

1F

16

38

1B

24

2D

22

17

36

13

1E

29

1C

34

18

PREG

B0

192.44

192.64

192.92

193.30

193.85

194.23

194.73

195.40

195.68

196.36

197.02

197.27

197.85

198.55

198.95

199.21

200.45

201.60

201.82

202.14

202.66

203.06

203.64

204.19

204.55

204.98

205.23

206.18

207.27

207.61

208.26

208.88

209.17

210.00

210.76

211.00

211.47

211.91

212.73

213.47

A–19

Table A–1. PLL Register Settings for 14.31818 MHz Reference (Continued)

OUTPUT

213.82

214.15

214.77

215.35

215.61

216.36

217.03

217.64

218.18

218.68

219.13

219.55

219.93

VCO

NREG

B2

MREG

25

PREG

B0

213.82

214.15

214.77

215.35

215.61

216.36

217.03

217.64

218.18

218.68

219.13

219.55

219.93

AA

B9

16

32

A8

12

B0

21

B8

30

AE

B7

1D

2E

19

AC

B6

2C

15

AA

B5

2A

11

A8

A–20

Appendix B

PLL Programming Examples

Loop Clock PLL

The internal structure of the loop clock PLL is shown in Figure B–1. The loop clock PLL is used to phase

align the received LCLK with the internal dot clock in order to ensure reliable data latching into the

TVP3026M. The phase detector performs phase comparison at the rising edge of the received clocks after

the N and M prescalars. The charge pump and loop filter generate an analog control signal to the voltage

controlled oscillator. The VCO frequency is then divided by the P and Q post-scalers. The P post-scalar

provides division ratios of 1, 2, 4, or 8. The Q post-scalar provides additional division ratios of 2, 4, 6, 8, 10,

12, 14 and 16. The Q post-scalar provides for the extra low frequencies needed for low-resolution graphics

using a high multiplex ratio, such as 640 x 480, 8 bits/pixel, using a 64-bit pixel bus. The output from the loop

clock PLL or the pixel clock PLL can be selected for output on the RCLK terminal.

1

Dot Clock

65–N

Up

Phase

Detector

Charge

Pump

1

2

1

OUT

VCO

Down

P

2(Q+1)

1

LCLK

65–M

Figure B–1. Loop Clock PLL Structure

As a programming example, follow the procedure of subsection 2.4.3, Programming for All Modes Except

Packed-24.1 for a mode using a 170 MHz pixel clock, 8 bits/pixel, a 64-bit pixel bus, and an external division

factor (through the GUI accelerator) of 2.

f

170 MHz,

B

8,

W

64,

K

2

D

8

64

B

f

170

21.25 MHz

42.5 MHz

L

D

W

f

K

f

2

21.25

65

R

L

64

49

8

W

B

N

65

2

0x31

2.59

M

Z

63

0x3F

55 (65 N)

55 (65 49)

170

2

f

K

D

Since Z < 16 and log (Z) is between 1 and 2, then P = 1 and Q = 0

2

Since bits 7,6 of the N-value register must be 1,0 the N-value register is loaded with 0x31 + 0x80 = 0xB1.

The M-value register is loaded with 0x3F. Since bits 7–2 of the P-value register must be 1111 00, the P-value

register is loaded with 0x01 + 0xF0 = 0xF1. Bits 2–0 of the MCLK/loop clock control register (index: 0x39)

are loaded with the Q value of 000.

B–1

The resulting divide ratios and clock frequencies are illustrated in Figure B–2.

TVP3026M

Loop Clock PLL

Dot Clock

170 MHz

10.625 MHz

÷ 16

85 MHz

170 MHz

VCO

Up

N = 49

(65 –N = 16)

42.5 MHz

OUT

Phase

Detector

Charge

Pump

÷ 2

Down

LCLK

P = 1

(2 = 2) (2

Q = 0

[Q +1] = 2)

÷ 2

P

10.625 MHz

21.25 MHz

M = 63

(65 –M = 2)

GUI Accelerator

÷ 2

21.25 MHz

42.5 MHz

K = 2

Figure B–2. Loop Clock PLL Example

Pixel Clock and MCLK PLLs

The internal structure used for the pixel clock and MCLK PLLs is shown in Figure B–3. These PLLs are used

to synthesize the pixel clock and MCLK frequencies. The reference clock can be either a resonant crystal

or can be driven with a TTL-level signal. The phase detector performs phase comparison at the rising edge

of the received clocks after the N and M prescalers. The charge pump and loop filter generate an analog

control signal to the voltage-controlled oscillator (VCO). The VCO frequency is then divided by the P post

scalar. The P post scalar provides division ratios of 1, 2, 4, or 8. The output from the pixel clock PLL or the

loop clock PLL can be selected for output on the RCLK terminal. The output from the MCLK PLL or the

internaldot clock (to provide a smooth transition on MCLK) can be selected for output on the MCLK terminal.

The same PLL register values can be used for the pixel clock PLL or MCLK PLL, as long as the output

frequency of the MCLK PLL does not exceed 100 MHz.

1

Ref Clock

65–N

Up

Phase

Detector

Charge

Pump

1

2

OUT

VCO

Down

P

1

65–M

1

8

Figure B–3. Pixel Clock and MCLK PLL Structure

As a programming example, consider programming the pixel clock PLL for a mode using a 170-MHz pixel

clock. Since the reference clock is the common 14.31818-MHz crystal, the register values in Appendix A

B–2

can be used directly. The closest frequency in Table A–1 is 169.53 MHz for which the PLL registers are

loaded with N-value register = 0xA8, M-value register = 0x1C, and P-value register = 0xB0. The N and M

numbers are the lower 6 bits of the N-value register and the M-value register respectively. The P number

is the lower two bits of the P-value register. After extracting and converting to decimal, this becomes

N = 40, M = 28, and P = 0. The resulting divide ratios for the prescalers and the post-scalar and the resulting

clock frequencies are illustrated in Figure B–4.

Ref Clock

0.57 MHz

÷ 25

14.31818 MHz

Up

N = 40

(65 –N = 25)

Phase

Detector

Charge

Pump

OUT

169.53 MHz

VCO

÷ 1

Down

P = 0

(2 = 1)

21.19 MHz

P

÷ 37

0.57 MHz

M = 28

(65 –M = 37)

÷ 8

21.19 MHz

169.53 MHz

Figure B–4. Pixel Clock PLL Example

The equations given in subsection 2.4.1, Pixel Clock PLL, give the same result for the VCO frequency and

PLL output frequency. The VCO frequency is within the specified limits.

65

M

N

65 28

65 40

f

8

f

8

14.31818

169.53 MHz

VCO

REF

110 MHz

F

220 MHz

VCO

f

VCO

169.53

2

f

169.53 MHz

PLL

0

P

2

B–3

B–4

Appendix C

Mechanical Data

HFG (S-CQFP-F164)

CERAMIC QUAD FLATPACK WITH TIE-BAR

1.165 (29,59)

1.125 (28,58)

1.002 (25,45)

0.998 (25,35)

0.275 (6,99)

0.175 (4,44)

Tie Bar Width

”A”

41

1

42

164

Heatsink

1.710 (43,43)

1.690 (42,93)

2.505 (63,63)

2.485 (63,12)

82

124

83

123

”C”

”B”

1.150 (29,21)

8 Places

0.105 (2,67) MAX

0.061 (1,55)

DIA 4 Places

0.059 (1,50)

0.018 (0,46) MAX

0.010 (0,25)

0.006 (0,15)

164

Braze

0.014 (0,36)

0.002 (0,05)

0.040 (1,02)

0.030 (0,76)

0.008 (0,20)

0.004 (0,10)

0.020 (0,51) MAX

DETAIL ”B”

0.025 (0,65)

0.130 (3,30) MAX

4040231-7/D 02/96

DETAIL ”A”

DETAIL ”C”

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.

C. Ceramic quad flatpack with flat leads brazed to nonconductive tie bar carrier.

D. This package can be hermetically sealed with a metal lid.

E. The terminals are gold plated.

F. Falls within JEDEC MO-113 AE

C–1

C–2