Datasheet BT869KRF, BT868KRF Datasheet (CONEX)

Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

TM

The Bt868/869 is specifically designed for video systems requiring the generation of
high-quality flicker-free composite and Y/C (S-video) signals from various YCrCb or
RGB digital streams. The Bt868/869 accepts any input format from 640 x 480 to
800 x 600 resolution.

The Bt868/869 uses Conexant’s UltraScale™ technology to provide the most
advanced vertical and horizontal scaling necessary for the display of non-interlaced
data on interlaced devices such as the TV. The UltraScale™ technology converts the
lines of input pixel data to the appropriate number of output lines for producing a
full-screen, high-quality image.

The Bt868/869 performs 5-line vertical filtering, which includes poly phase
interpolation scaling for overscan compensation and flicker filtering. Horizontal
scaling for overscan compensation is achieved by altering the encoder clock
frequency. This approach preserves all of the high frequency components of the
input signals, which are essential for the highest quality display of text intensive
images such as web pages on TVs. The amount of flicker filtering and overscan
compensation is programmable.

Worldwide video standards are supported, including NTSC-M (N. America,
Taiwan, Japan), PAL-B,D,G,H,I (Europe, Asia), PAL-M (Brazil), PAL-N (Uruguay,
Paraguay), and PAL-Nc (Argentina). Bt868 and Bt869 are functionally identical, with
the exception that Bt869 can output Macrovision Level 7.0 anticopy algorithm.

Functional Block Diagram

P[23:0]

HSYNC*
VSYNC*

BLANK*

FIELD

SIC

SID

ALTADDR

RESET*

SLEEP

SLAVE

PAL

XTALIN

XTALOUT

Input Flicker

DEMUX

Timing

Serial

Interface

XTAL

OSC

Color Space

Video

Encoder

PLL

Filter/ScalerConversion

Internal

Reference

Clock

Generation

DAC
MUX

FIFO

BIAS
GEN

FSADJUST

COMP

VREF

DACA

DACB

DACC

VBIAS

CLKO

CLKI

Technology

Distinguishing Features

• Digital RGB or YCrCb non-interlaced
input to interlaced or non-interlaced
analog TV output modes:

YCrCb Modes:

– 16-bit 4:2:2 multiplexed 8-bit
– 24-bit 4:4:4 multiplexed 12-bit
– 24-bit 4:4:4 non-multiplexed 24-bit

RGB Modes:

– 15/16 bit 5:6:5 RGB multiplexed 8-bit
– 24-bit 8:8:8 RGB mulitplexed 12-bit
– 24-bit 8:8:8 RGB non-multiplexed

24-bit

• Digital RGB non-interlaced input to
analog RGB noninterlaced (VGA/SVGA)
output modes:

– 15/16 bit 5:6:5 RGB multiplexed 8-bit
– 24-bit 8:8:8 RGB mulitplexed 12-bit
– 24-bit 8:8:8 RGB non-multiplexed

24-bit

• Support for NTSC/PAL outputs in the
following modes:

– Interlaced and non-interlaced outputs
– S-video output (simultaneous with

composite NTSC or PAL outputs)

– Component YUV analog output mode

• 5-line vertical filtering scaling for

overscan compensation and flicker
filtering

• CCIR601 compatible input mode

• Luma and chroma comb filtering

• 3 x 10-bit DACs

• 6 MHz Luma bandwidth

• Macrovision 7.0 copy protection

• 80-pin PQFP package

• 3.3 V operation with 5 V tolerant IOs

• 2-line serial programming interface

• Power-Down modes

• Master/slave video timing operation

• TV connected register flag

• Automatic configuration

Applications

• Desktop/Portable PCs with TV-Out

• Living-room PCs

• Internet PC/TVs

• Internet Appliances

Data Sheet 100123B

September 2000

Ordering Information

Model Number Package Ambient Temperature Range Reduced Features

Bt868KRF 80-pin PQFP 0

Bt869KRF 80-pin PQFP 0

© 2000, Conexant Systems, Inc.

All Rights Reserved.

Information in this document is provided in connection with Conexant Systems, Inc. (“Conexant”) products. These materials are
provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no
responsibility for errors or omissions in these materials. Conexant may make changes to specifications and product descriptions at
any time, without notice. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for
conflicts or incompatibilities arising from future changes to its specifications and product descriptions.

° C to +70° C No Macrovision Feature

° C to +70° C —

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TO SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A
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100123B Conexant

Table of Contents

List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

1.0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.2 GUI Controller Programmability and Frequency Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.3 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

1.3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

1.3.2 Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

1.3.3 Timing Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

1.3.4 Device Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

1.3.5 Auto Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

1.3.6 Clocking and Timing Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

1.3.7 Master and Slave Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

1.3.8 Input Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

1.3.9 Pixel Input Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

1.3.10 Output Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

1.3.11 YCrCb Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

1.3.12 RGB Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

1.3.13 Video Amplitude Scaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

1.3.14 Input Pixel Horizontal Sync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

1.3.15 Input Pixel Vertical Sync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

1.3.16 Input Pixel Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

1.3.17 Overscan Compensation and Flicker Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

1.3.18 VGA Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.3.19 Analog Horizontal Sync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.3.20 Analog Vertical Sync. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.3.21 Analog Video Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.3.22 Video Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

1.3.23 Subcarrier Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29

1.3.24 Burst Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

1.3.25 Chrominance Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

1.3.26 Digital Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

1.3.27 Subcarrier Phasing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

100123B Conexant iii

Table of Contents Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

1.3.28 Noninterlaced Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

1.3.29 Closed Captioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

1.3.30 Internal Color Bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

1.3.31 Macrovision Encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

1.3.32 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

1.3.33 Output Connection Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

1.3.34 Output Filtering and SINX/X Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

1.3.35 Power-Down Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34

1.3.36 Serial Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34

2.0 Internal Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.1 Essential Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.2 Writing Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.3 Reading Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

3.0 PC Board Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.1 Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

TM

Technology

3.2 Power and Ground Planes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.3 Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.3.1 Device Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.3.2 Power Supply Decoupling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.3.3 COMP Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.3.4 VREF Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.3.5 VBIAS Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

3.4 Signal Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3.4.1 Digital Signal Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3.4.2 Analog Signal Interconnect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

3.5 Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

3.5.1 Electrostatic Discharge and Latchup Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

3.5.2 Clock and Subcarrier Stability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

3.5.3 Filtering Radio Frequency Modulator Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

3.6 Bt868/Bt869 Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

3.7 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

3.7.1 Data Transfer on the Serial Interface Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

4.0 Parametric Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.1 DC Electrical Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.2 AC Electrical Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4.3 Mechanical Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Appendix A. Scaling and I/O Timing Register Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Appendix B. Approved Crystal Vendors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

iv Conexant 100123B

Bt868/Bt869 List of Figures

Flicker-Free Video Encoder with Ultrascale

TM

Technology

List of Figures

Figure 1-1. Pinout Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Figure 1-2. Flicker Filter Control Diagram—External Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Figure 1-3. Encoder Core. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Figure 1-4. Decimation Filter at Fs=27 MHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

Figure 1-5. Interlaced 525-Line (NTSC) Video Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

Figure 1-6. Interlaced 525-Line (PAL-M) Video Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

Figure 1-7. Interlaced 625-Line (PAL–B, D, G, H, I, Nc) Video Timing (Fields 1–4) . . . . . . . . . . . . . . . 1-24

Figure 1-8. Interlaced 625-Line (PAL–B, D, G, H, I, Nc) Video Timing (Fields 5–8) . . . . . . . . . . . . . . . 1-25

Figure 1-9. Interlaced 625-Line (PAL–N) Video Timing (Fields 1–4) . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

Figure 1-10. Interlaced 625-Line (PAL–N) Video Timing (Fields 5–8) . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

Figure 1-11. Noninterlaced 262-Line (NTSC) Video Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

Figure 1-12. Noninterlaced 262-Line (PAL–M) Video Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

Figure 1-13. Noninterlaced 312-Line (PAL–B, D, G, H, I, N, Nc) Video Timing . . . . . . . . . . . . . . . . . . . 1-29

Figure 1-14. Three-Stage Chroma Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30

Figure 1-15. Luminance Upsampling Filter Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

Figure 3-1. Power Plane Illustration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Figure 3-2. Connection Diagram for Output Filters and Other Key Passive Components. . . . . . . . . . . . 3-3

Figure 3-3. Complete Bt868/Bt869 Recommended Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Figure 3-4. Bt868/Bt869 Evaluation Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Figure 3-5. SID/SIC Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Figure 4-1. Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Figure 4-2. Master Mode with Flicker Filter Interface Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Figure 4-3. Slave Mode with Flicker Filter Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Figure A-1. Overscan Compensation, 640x480 NTSC, 20 Clock Hblank . . . . . . . . . . . . . . . . . . . . . . . . A-2

Figure A-2. Overscan Compensation, 640x480 PAL, 20 Clock Hblank . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Figure A-3. Overscan Compensation, 800x600 NTSC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Figure A-4. Overscan Compensation, 800x600 PAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

100123B Conexant vii

List of Figures Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

TM

Technology

viii Conexant 100123B

Bt868/Bt869 List of Tables

Flicker-Free Video Encoder with Ultrascale

TM

Technology

List of Tables

Table 1-1. Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Table 1-2. Data Pin Assignments for Multiplexed Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Table 1-3. Data Pin Assignments for Non-multiplexed Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Table 1-4. Programmability and Frequency Requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Table 1-5. Auto-Configuration Modes 0–3—RGB Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

Table 1-6. Auto-Configuration Modes 4–7—YCrCb Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Table 1-7. Video Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

Table 1-8. Video Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

Table 2-1. Register Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Table 2-2. Read-Back Bit Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Table 2-3. Data Details Defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Table 2-4. Programming Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Table 3-1. Typical Parts List for Key Passive Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Table 4-1. Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Table 4-2. Absolute Maximum Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Table 4-3. DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Table 4-4. AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Table A-1. Video Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Table A-2. Constant Values Dependent on Encoding Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Table A-3. Overscan Values, 640x480 NTSC, 1 Pixel Resolution, 2.5 ms Hblank . . . . . . . . . . . . . . . . . A-5

Table A-4. Overscan Values, 640x480 NTSC, 8 Pixel Resolution, 2.5 ms Hblank . . . . . . . . . . . . . . . . . A-7

Table A-5. Overscan Values, 640x480 NTSC, 9 Pixel Resolution, 2.5 ms Hblank . . . . . . . . . . . . . . . . . A-8

Table A-6. Overscan Values, 640x480 PAL, 1 Pixel Resolution, 2.5 ms Hblank. . . . . . . . . . . . . . . . . . . A-8

Table A-7. Overscan Values, 640x480 PAL, 8 Pixel Resolution, 2.5 ms Hblank. . . . . . . . . . . . . . . . . . A-11

Table A-8. Overscan Values, 640x480 PAL, 9 Pixel Resolution, 2.5 ms Hblank. . . . . . . . . . . . . . . . . . A-12

Table A-9. Overscan Values, 800x600 NTSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13

Table A-10. Overscan Values, 800x600, PAL, > 2.5 ms Hblank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-17

100123B Conexant ix

List of Tables Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

TM

Technology

x Conexant 100123B

1

1.0 Functional Description

1.1 Pin Descriptions

The pinout diagram is shown in Figure 1-1. Pin names, input/output assignments,
numbers and descriptions are listed in Tab le s 1-2 and 1-3.

Figure 1-1. Pinout Diagram

VAA_PLL

VDD

AGND_PLL

VDD_CO

VSS_CO

RESET*

CLKO

SLEEP

CLKI

ALTADDR

VDDMAX

VDD_SO

SLAVE

VDD_SI

PA L

VSS_SO

VSS_SI

SIC

VSS

SID

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

VDD_X

XTALOUT

XTALIN

VSS_X

N/C
N/C
N/C

DACA

VAA_DACA

DACB

VAA_DACB

DACC

VAA_DACC

AGND_DAC

COMP

VREF

VBIAS

FSADJUST

AGND

VAA

61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

123456789

80-pin PQFP

1011121314

15

1617181920

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

VDD

TEST
BLANK*
FIELD
VSYNC*
HSYNC*
P[23]
P[22]
P[21]
VSS_O
VDD_O
P[20]
P[19]
P[18]
P[17]
P[16]
P[15]
P[14]
VSS_I
VSS

NC

NC

P[0]

P[1]

P[2]

P[3]

P[4]

P[5]

P[6]

P[7]

P[8]

VSS

AGND

100123B Conexant 1-1

P[9]

P[10]

P[11]

VDD

P[12]

P[13]

VDD_I

1.0 Functional Description Bt868/Bt869

1.1 Pin Descriptions Flicker-Free Video Encoder with Ultrascale

Table 1-1. Pin Assignments (1 of 3)

Pin Name I/O Pin # Description

XTALIN I 63 A crystal can be connected to these pins. The pixel clock output (CLKO) is

XTALOUT O 62

VDD_X — 61 Crystal oscillator supply pin. This pin should be tied to the digital supply.

VSS_X — 64 Crystal oscillator ground pin. This pin should be tied to the digital ground

VAA_PLL — 59 Analog power for PLL. All VAA and VDD pins must be connected together on

AGND_PLL — 58 Analog ground for PLL. All AGND and VSS pins must be connected together

CLKO O 56 Pixel clock output (TTL compatible). This pin is three-state if the CLKI pin

VDD_CO — 57 Clock output supply pin. This pin should be tied to the digital supply.

VSS_CO — 55 Clock output ground pin. This pin should be tied to the digital ground plane.

derived from these pins with a PLL. XTALIN can be driven as a CMOS input
pin.

plane.

the same PCB plane to prevent latchup.

on the same PCB plane to prevent latchup.

provides the encoder clock.

TM

Technology

CLKI I 54 Pixel clock input (TTL compatible). This may be used as either the encoder

clock or a delayed version of the CLKO pin synchronized with the pixel data
input.

RESET* I 53 Reset control input (TTL compatible). A logical 0 resets and disables video

timing (horizontal, vertical, subcarrier counters to the start of VSYNC of first
field) and resets the serial interface registers). RESET* must be a logical 1
for normal operation.

SLEEP I 52 Power-down control input (TTL compatible). A logical 1 configures the

device for power-down mode. A logical 0 configures the device for normal
operation.

SLAVE I 51 Slave/master mode select input (TTL compatible). A logical 1 configures the

device for slave video timing operation. A logical 0 configures the device for
master video timing operation.

PAL I 50 PAL/NTSC mode select input (TTL compatible). A logical 1 configures the

device for PAL video format and Mode 1. A logical 0 configures the device
for NTSC video format and Mode 0.

VDDMAX I 49 Input threshold adjustment. This pin should be tied to VDD for 3.3 V input

swings and GND for 5 V input swings. This pin does not affect the serial
interface pins (SID and SIC).

ALTADDR I 48 Alternate slave address input (TTL compatible). A logical 0 configures the

device to respond to a serial programming address of 0x88; a logical 1
configures the device to respond to a serial programming address of

(1)

0x8A.

SIC I 45 Serial interface clock input (TTL compatible). The maximum clock rate is

400 kHz.

SID I/O 44 Serial interface data input/output (TTL compatible). Data is written to and

read from the device via this serial bus.

VDD_SI — 47 Serial interface input supply pin. This pin should be tied to the proper supply

voltage for the desired serial interface operating voltage (i.e., tie to 5 V for
5 V serial interface compatibility).

1-2 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Table 1-1. Pin Assignments (2 of 3)

Pin Name I/O Pin # Description

VSS_SI — 42 Serial interface input ground pin. This pin should be tied to the digital

VDD_SO — 46 Serial interface output supply pin. This pin should be tied to the proper

VSS_SO — 43 Serial interface output ground pin. This pin should be tied to the digital

TEST I 39 Test pin. Should be tied to VSS.

BLANK* I/O 38 Composite blanking control (TTL compatible). This can be generated by the

FIELD O 37 Field control output (TTL compatible) (Master Mode only three-state in slave

TM

Technology 1.1 Pin Descriptions

ground plane.

supply voltage for the desired serial interface operating voltage (i.e., tie to
5 V for 5 V serial interface compatibility).

ground plane.

encoder or supplied from the graphics controller. If internal blanking is used,
this pin can be used to indicate the controller character clock edge.

mode). FIELD transitions after the rising edge of CLK, two clock cycles
following falling HSYNC*. It is a logical 0 during odd fields and is a logical 1
during even fields.

VSYNC* I/O 36 Vertical sync input/output (TTL compatible). As an output (master mode

operation), VSYNC* is output following the rising edge of CLK. As an input
(slave mode operation), VSYNC* is registered on the rising edge of CLK.

HSYNC* I/O 35 Horizontal sync input/output (TTL compatible). As an output (master mode

operation), HSYNC* is output following the rising edge of CLK. As an input
(slave mode operation), HSYNC* is registered on the rising edge of CLK.

P[23:0] I 32–34, 23–29, 5–18 Pixel inputs. See Table 1-2, “Data Pin Assignments for Multiplexed Modes,”

on page 1.05. The input data is sampled on both the rising and falling edge

of CLK for multiplexed modes, and on the rising edge of clock in
non-multiplexed modes. A higher bit index corresponds to a greater bit
significance.

VDD — 20,40,60 Digital power for core logic. All VAA and VDD pins must be connected

together on the same PCB plane to prevent latchup.

VDD_I — 19 Digital power for digital inputs. All VAA and VDD pins must be connected

together on the same PCB plane to prevent latchup. This pin should be tied
to the 5 V supply for 5 V tolerant inputs,

VDD_O — 30 Digital power for digital outputs. All VAA and VDD pins must be connected

together on the same PCB plane to prevent latchup.

VSS — 4, 21, 41 Digital ground for core logic. All AGND and VSS pins must be connected

together on the same PCB plane to prevent latchup.

VSS_I — 22 Digital ground for inputs. All AGND and VSS pins must be connected

together on the same PCB plane to prevent latchup.

VSS_O — 31 Digital ground for outputs. All AGND and VSS pins must be connected

together on the same PCB plane to prevent latchup.

VAA — 80 Analog power. All VAA and VDD pins must be connected together on the

same PCB plane to prevent latchup.

AGND — 1, 79 Analog ground. All AGND and VSS pins must be connected together on the

same PCB plane to prevent latchup.

100123B Conexant 1-3

1.0 Functional Description Bt868/Bt869

1.1 Pin Descriptions Flicker-Free Video Encoder with Ultrascale

Table 1-1. Pin Assignments (3 of 3)

Pin Name I/O Pin # Description

FSADJUST I 78 Full-scale adjust control pin. A resistor (RSET) connected between this pin

and GND controls the full-scale output current on the analog outputs.

VBIAS O 77 DAC bias voltage. A 0.1 µF ceramic capacitor must be used to bypass this

pin to GND. The capacitor must be as close to the device as possible to keep
lead lengths to an absolute minimum.

VREF O 76 Voltage reference pin. A 0.1 µF ceramic capacitor must be used to decouple

this pin to GND. The decoupling capacitor must be as close to the device as
possible to keep lead lengths to an absolute minimum.

COMP O 75 Compensation pin. A 0.1 µF ceramic capacitor must be used to bypass this

pin to VAA. The capacitor must be as close to the device as possible to keep
lead lengths to an absolute minimum.

AGND_DAC — 74 Common DAC Analog ground return. All AGND and VSS pins must be

connected together on the same PCB plane to prevent latchup.

VAA_DACC — 73 DACC Analog power. All VAA and VDD pins must be connected together on

the same PCB plane to prevent latchup.

TM

Technology

DACC O 72 DACC output.

VAA_DACB — 71 DACB Analog power. All VAA and VDD pins must be connected together on

the same PCB plane to prevent latchup.

DACB O 70 DACB output.

VAA_DACA — 69 DACA Analog power. All VAA and VDD pins must be connected together on

the same PCB plane to prevent latchup.

DACA O 68 DACA output.

N/C — 65, 66, 67 No connect pins

NOTE(S):

(1)

Any unused inputs should not be left floating.

1-4 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Table 1-2. Data Pin Assignments for Multiplexed Modes

Rising Edge of CLKI Falling Edge of CLKI

TM

Technology 1.1 Pin Descriptions

Pin

P[11] G4 G2 Cr/Cb7 Cr7 R7 R4 Y7 Y7

P[10] G3 G1 Cr/Cb6 Cr6 R6 R3 Y6 Y6

P[9] G2 G0 Cr/Cb5 Cr5 R5 R2 Y5 Y5

P[8] B7 B4 Cr/Cb4 Cr4 R4 R1 Y4 Y4

P[7] B6 B3 Cr/Cb3 Cr3 R3 R0 Y3 Y3

P[6] B5 B2 Cr/Cb2 Cr2 G7

P[5] B4 B1 Cr/Cb1 Cr1 G6 G4 Y1 Y1

P[4] B3 B0 Cr/Cb0 Cr0 G5 G3 Y0 Y0

P[3] G0 ——Cb7 R2 —— Cb3

P[2] B2 ——Cb6 R1 —— Cb2

P[1] B1 ——Cb5 R0 —— Cb1

P[0] B0 ——Cb4 G1 —— Cb0

NOTE(S):

(1)

G5 is ignored in 15-bit RGB mode.

24-bit

RGB

Mode

15/16-bit

RGB

Mode

16-bit
YCrCb
Mode

24-bit
YCrCb

Mode

24-bit

RGB

Mode

15/16-bit

RGB

Mode

(1)

G5

16-bit
YCrCb
Mode

Y2 Y2

24-bit
YCrCb

Mode

Table 1-3. Data Pin Assignments for Non-multiplexed Modes

Pin 24-bit RGB Mode 24-bit YCrCb Mode

P[23:16] B[7:0] Cb[7:0]

P[15:8] G[7:0] Cr[7:0]

P[7:0] R[7:0] CY[7:0]

100123B Conexant 1-5

1.0 Functional Description Bt868/Bt869

1.2 GUI Controller Programmability and Frequency RequirementFlicker-Free Video Encoder with Ultrascale

TM

Technology

1.2 GUI Controller Programmability and Frequency Requirement

Programmability and frequency requirements for the GUI Controller are defined
in Tabl e 1- 4.

Table 1-4. Programmability and Frequency Requirement

Maximum Total Maximum

Mode

Pixels Lines Line (kHz) Pixel (MHz)

640 x 480 1075 665 117 39.860 31.563

800 x 600 1075 835 147 49.451 40.000

Vsync to

Active

Maximum Frequencies

1-6 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Figure 1-2 illustrates the concept of flicker filter control.

Figure 1-2. Flicker Filter Control Diagram—External Use

FIFO

YCORING[2:0]

YAT TE N UAT E [2 : 0 ]

TM

Technology 1.2 GUI Controller Programmability and Frequency Requirement

of Range

of Range

of Range

of Range

of Range

of Range

101 = 1/8

010 = 1/64

011 = 1/32

001 = 1/128

000 = Bypass

000 = 1.0 Gain

010 = 7/8 Gain

001 = 15/16 Gain

100 = 1/16

011 = 3/4 Gain

100 = 1/2 Gain

101 = 1/4 Gain

110 = 1/4

111 = Reserved

CCORING[2:0]

110 = 1/8 Gain

111 = 0.0 Gain

CATTENUATE[2:0]

of Range

of Range

of Range

of Range

of Range

of Range

011 = +/- 1/64

000 = Bypass

001 = +/-1/256

010 = +/- 1/128

000 = 1.0 Gain

010 = 7/8 Gain

001 = 15/16 Gain

100 = +/- 1/32

011 = 3/4 Gain

100 = 1/2 Gain

101 = 1/4 Gain

110 = +/- 1/8

101 = +/- 1/16

110 = 1/8 Gain

111 = 0.0 Gain

111 = Reserved

Color

Space

LPF2

LPF3

Horizontal

11 = Luma,

CLPF[1:0]

LPF1

Horizontal

00 = Bypass

01 = Luma,

Luma

Initial

0 = Enable

DIS_YFLPF

Horizontal

10 = Luma,

Filter

Low Pass

Horizontal

Flicker Filter/Scaler

LPF1

Horizontal

00 = Bypass

10 = Chroma,

01 = Chroma,

Horizontal

Horizontal

11 = Chroma,

LPF3

LPF2

Luma

Gamma

Removal

0 = Enable

Anti-Pseudo

DIS_GMUSHY

Luma

Psuedo

0 = Enable

DIS_GMSHY YLPF[1:0]

000 = 5 Line

001 = 2 Line

F_SELY[2:0]

Converter

DIS_GMUSHC

Gamma

Removal

DIS_GMSHC

010 = 3 Line

011 = 4 Line

100 = Alt. 5 Line 1

Gamma

Chroma

Removal

0 = Enable

Anti-Psuedo

Gamma

Psuedo

Chroma

Removal

0 = Enable

000 = 5 Line

001 = 2 Line

010 = 3 Line

101 = Alt. 5 Line 2

110 = Alt. 5 Line 3

F_SELC[2:0]

111 = Alt. 5 Line 4

011 = 4 Line

100 = Alt. 5 Line 1

101 = Alt. 5 Line 2

110 = Alt. 5 Line 3

111 = Alt. 5 Line 4

Input

RGB Mux

RGB Mux

000 = 24-bit

IN_MODE[2:0]

RGB Mux

010 = 15-bit

001 = 16-bit

011 = 24-bit

RGB Non-Mux

101 = 16-bit

YCrCb Mux

100 = 24-bit

YCrCb Mux

111 = 24-bit

110 = Reserved

YCrCb Non-Mux

100123B Conexant 1-7

1.0 Functional Description Bt868/Bt869

1.2 GUI Controller Programmability and Frequency RequirementFlicker-Free Video Encoder with Ultrascale

TM

Technology

Figure 1-3 illustrates the Bt868/869 functional block diagram.

Figure 1-3. Encoder Core

COMP

VBIAS

FSADJUST

Reference

Internal Voltage

Y10

DACA

DAC

10

Out

Mode

+

Luma

Delay

CVBS 10

+

10

Out

DACB

DAC

Mux

C10

DACC

DAC

10

10

U/V

2X

Upsample

and

Mixer

Modulator

9

Video

SYNC_AMP

FIELD

Timing

RESET*

Sync

Processor

MY

SID

Control,

Registers

+

X

Closed

Captioning,

Macrovision

Y[9:0]

MCR

2X

Upsample

LPF

4:2:2

to 4:4:4

Conversion

9

X

Burst

Processor

MCB

CRCB[9:0]

RGB 24

BST_AMP

RGB

1-8 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

TM

Technology 1.3 Circuit Description

1.3 Circuit Description

1.3.1 Overview

The Bt868/869 is a video encoder designed for TV output of non-interlaced
graphics data, such as that found in a PC or some set-top boxes. It incorporates
advanced filtering technology for flicker removal and overscan compensation
which allows high-quality display of non-interlaced images on an interlaced TV
display. The Bt868/869 accomplishes this by minimizing the flicker and providing
control of the amount of overscan so that the entire image is viewable.

The Bt868/869 consists of a Color Space Converter/Flicker Filter engine
followed by a digital video encoder. The Color Space Converter/Flicker Filter
contains the following:

•A timing converter

• Various horizontal video processing functions

• Flicker filter and vertical scaler for overscan compensation

1.3.2 Reset

The output of this engine is fed into a FIFO for synchronization with the
digital video encoder.

If the RESET* pin is held low for a minimum of two clock cycles, a timing reset
and a software reset is performed. During a timing reset, the serial interface is
held in the reset condition, the subcarrier phase is set to zero, and the horizontal
and vertical counters are held to the beginning of VSYNC of Field 1 (both
counters equal to zero). Counting resumes the next clock after rising RESET*.
The serial interface registers are reset to zero.

A software reset, which can be generated by setting the SRESET register bit,
initializes all the serial interface registers to zero (except for PLL_INT, which is
initialized to 0x0C). As a result, all output pins are three-state. The f irst 32
registers are then initialized to auto-configuration mode 0 (see the Auto
Configuration section). The EN_OUT bit must be set to enable the outputs. The
software reset can also be generated by setting the SRESET register bit.

A power-on reset is generated on power-up. The power-on reset generates both
a timing and a software reset. The power-on reset is generated by a time delay
circuit triggered after the supply voltage reaches a value sufficiently high enough
for the circuit to operate. As such, the device may not initialize to the default state
unless the power supply ramp rate is sufficiently fast enough. Therefore, a
hardware reset is recommended if the default state is required.

1.3.3 Timing Registers

After writing any registers, a timing reset is recommended by setting the T-bit.

100123B Conexant 1-9

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

1.3.4 Device Initialization

After a reset condition, the device must be programmed through the serial
interface to activate video or output one of the other video standards and to enable
the CLK0, HSYNC*, VSYNC*, and FIELD outputs.

1.3.5 Auto Configuration

The device can configure itself for one of eight combinations of video formats
and input modes with a single register write. Tab le s 1- 5 and 1-6 detail the eight
available auto configuration modes. This feature reduces the software support
required, yet allows full flexibility in generating video formats and timing. Once
the device is configured, all the registers are accessible to modify the modes. For
less common modes, the device can be configured for the closest mode, and only
those registers that differ need to be programmed. To auto-configure the device,
set the configuration bits (CONFIG[2:0]) to the desired mode. The device will
initialize the first 32 registers (registers 0x3B to 0x5A), setting the BUSY flag in
the process. When complete, the BUSY flag is cleared. The serial interface is not
available when the BUSY flag is high except for monitoring the status register.

If the mux mode is enabled, pins P[23:21] can also be used to externally
configure the device to any one of the eight configuration modes. These pins
directly emulate the CONFIG[2:0] register. In order to configure the device in
this way, the EN_PINCFG register must be set. The desired state must be present
on the P[23:21] pins for at least two clock cycles.

TM

Technology

1-10 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Table 1-5. Auto-Configuration Modes 0–3—RGB Input (1 of 2)

TM

Technology 1.3 Circuit Description

Mode 0

NTSC 640x480

Register Name

H_CLKO [11:0] 1792 700 1888 760 2464 9A0 2304 900

H_ACTIVE [9:0] 640 280 640 280 800 320 800 320

HSYNC_WIDTH
[7:0]

HBURST_BEGIN
[7:0]

HBURST_END
[7:0]

H_BLANKO [10:0] 381 17D 449 1C1 597 255 525 20D

V_BLANKO [9:0] 34 22 46 2E 32 20 41 29

V_ACTIVEO [8:0] 212 D4 242 F2 216 D8 252 FC

H_FRACT [7:0]0000000 0

H_CLKI [10:0] 784 310 944 3B0 880 370 960 3C0

H_BLANKI [8:0] 126 7E 266 10A 66 42 140 8C

V_BLANK_DLY 0 0 0 0 0 0 0 0

V_LINESI [9:0] 600 258 625 271 735 2DF 750 2EE

V_BLANKI [7:0] 75 4B 90 5A 86 56 95 5F

CLKO=28.195793 MHz

DEC HEX DEC HEX DEC HEX DEC HEX

132 84 138 8A 182 B6 170 AA

150 96 166 A6 206 CE 202 CA

96 60 104 68 180 84 154 9A

(1

)

Mode 1

PAL 640x480

CLKO=29.500008 MHz

Mode 2

NTSC 800x600

CLKO=38.769241 MHz

Mode 3

PAL 800x600

CLKO=36.000000 MHz

V_ACTIVEI [9:0] 480 1E0 480 1E0 600 258 600 258

CLPF [1:0] 0000000 0

YLPF [1:0] 3333333 3

V_SCALE [13:0] 5266 1492 4096 1000 7373 1CCD 5734 1666

PLL_FRACT [15:0] 34830 880E 7282 1C72 15124 3B14 0 0

EN_XCLK 0 0 0 0 0 0 0 0

BY_PLL 0 0 0 0 0 0 0 0

PLL_INT [5:0] 12 C 13 D 17 11 16 10

EN_SCART 0 0 0 0 0 0 0 0

ECLIP 0 0 0 0 0 0 0 0

PAL 0011001 1

DIS_SCRESET 0 0 0 0 0 0 0 0

VSYNC_DUR 1 1 0 0 1 1 0 0

625LINE 0 0 1 1 0 0 1 1

SETUP 1100110 0

100123B Conexant 1-11

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

Table 1-5. Auto-Configuration Modes 0–3—RGB Input (2 of 2)

TM

Technology

Mode 0

NTSC 640x480

Register Name

NI_OUT 0000000 0

SYNC_AMP [7:0] 229 E5 240 F0 229 E5 240 F0

BST_AMP [7:0] 118 76 88 58 116 74 87 57

MCR [7:0] 121 79 129 81 119 77 128 80

MCB [7:0] 68447349674372 48

MY [7:0] 133 85 140 8C 133 85 140 8C

MSC [31:0] 545259520 20800000 645499916 26798C0C 396552378 17A2E8BA 528951320 1F872818

NOTE(S):

(1)

Assumes 13.5 MHz CLK-D frequency.

Table 1-6. Auto-Configuration Modes 4–7—YCrCb Input (1 of 2)

Register Name

CLKO=28.195793 MHz

DEC HEX DEC HEX DEC HEX DEC HEX

Mode 4

NTSC 640x480

CLKO=28.195793 MHz

(1

)

Mode 1

PAL 640x480

CLKO=29.500008 MHz

Mode 5

PAL 640x480

CLKO=29.500008 MHz

Mode 2

NTSC 800x600

CLKO=38.769241 MHz

Mode 6

NTSC 800x600

CLKO=38.769241 MHz

Mode 3

PAL 800x600

CLKO=36.000000 MHz

Mode 7

PAL 800x600

CLKO=36.000000 MHz

DEC HEX DEC HEX DEC HEX DEC HEX

H_CLKO [11:0] 1792 700 1888 760 2464 9A0 2304 900

H_ACTIVE [9:0] 640 280 640 280 800 320 800 320

HSYNC_WIDTH [7:0] 132 84 138 8A 182 B6 170 AA

HBURST_BEGIN
[7:0]

HBURST_END [7:0] 96 60 103 68 180 B4 154 9A

H_BLANKO [10:0] 381 17D 449 1C1 597 255 525 20D

V_BLANKO [9:0] 34 22 46 2E 32 20 41 29

V_ACTIVEO [8:0] 212 D4 242 F2 216 D8 252 FC

H_FRACT [7:0] 00000000

H_CLKI [10:0] 784 310 944 3B0 880 370 960 3C0

H_BLANKI [8:0] 126 7E 266 10A 66 42 140 8C

V_BLANK_DLY 0 0 0 0 0 0 0 0

V_LINESI [9:0] 600 258 625 271 735 2DF 750 2EE

V_BLANKI [7:0] 75 4B 90 5A 86 56 95 5F

V_ACTIVEI [9:0] 480 1E0 480 1E0 600 258 600 258

CLPF [1:0] 0000000 0

150 96 166 A6 206 CE 202 CA

1-12 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Table 1-6. Auto-Configuration Modes 4–7—YCrCb Input (2 of 2)

TM

Technology 1.3 Circuit Description

Mode 4

NTSC 640x480

Register Name

YLPF [1:0] 3333333 3

V_SCALE [13:0] 5266 1492 4096 1000 7373 1CCD 5734 1666

PLL_FRACT [15:0] 34830 880E 7282 1C72 15124 3B14 0 0

EN_XCLK 00000000

BY_PLL 0 0 0 0 0 0 0 0

PLL_INT [5:0] 12 C 13 D 17 11 16 10

EN_SCART 0 0 0 0 0 0 0 0

ECLIP 0 0 0 0 0 0 0 0

PAL 0011001 1

DIS_SCRESET 0 0 0 0 0 0 0 0

VSYNC_DUR 1 1 0 0 1 1 0 0

625LINE 0 0 1 1 0 0 1 1

SETUP 11001100

NI_OUT 0 0 0 0 0 0 0 0

CLKO=28.195793 MHz

DEC HEX DEC HEX DEC HEX DEC HEX

Mode 5

PAL 640x480

CLKO=29.500008 MHz

Mode 6

NTSC 800x600

CLKO=38.769241 MHz

Mode 7

PAL 800x600

CLKO=36.000000 MHz

SYNC_AMP [7:0] 229 E5 240 F0 229 E5 240 F0

BST_AMP [7:0] 118 76 88 58 116 74 87 57

MCR [7:0] 121 79 129 81 119 77 128 80

MCB [7:0] 684473 49 67 43 72 48

MY [7:0] 133 85 140 8C 133 85 140 8C

MSC [31:0] 545259520 20800000 645499916 26798C0C 396552378 17A2E8BA 528951320 1F872818

1.3.6 Clocking and Timing Generation

There are two timing generators that control the operation of the encoder. The
encoder timing block generates the signals for the proper encoding of the video
into NTSC or PAL, and extracts the processed input pixels from the internal
FIFO. The encoding timing generator can receive its clock from either an external
crystal oscillator and PLL, or from the CLKI pin. Normal operation requires that
the encoding clock be generated by the PLL. The clock source is selected by the
EN_XCLK register bit. If EN_XCLK is set to a logical 0, the internal clock
source is selected; and when the EN_OUT bit is set, the CLKO pin is enabled to
drive the derived clock.

A crystal must be present between XTALIN and XTALOUT pins if the
internal clock source is selected. The frequency of the CLK is synthesized by a
PLL such that the frequency is:

= F

F

clk

100123B Conexant 1-13

{PLL_INT(5:0) + [PLL_FRACT(15:0)/216]}/6

xtal *

1.0 Functional Description Bt868/Bt869

TM

Technology

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

The crystal must be chosen so that the precise line rate for the video standards
required can be achieved. This is done to maintain the subcarrier relationship to
the line rate and thereby achieve the precise subcarrier frequency as required by
the standard. The crystal oscillator is designed to oscillate from 5-25 MHz. A

13.5 MHz crystal meets the requirements for both NTSC and PAL video
standards. The crystal must be within 50 ppm of the maximum desired clock rate

for NTSC operation, and 25 ppm for PAL operation, across temperature (0° to
70°C). See Appendix B for list of recommended crystal vendors.

The crystal oscillator is disabled by the SLEEP pin. Sufficient time (greater
than approximately 1 second) must be allowed after coming out of sleep mode to
allow the oscillator to stabilize.

If the external clock source is selected (EN_XCLK=1), a clock signal of the
desired pixel clock rate must be present at the CLKI pin. The CLKO pin will be
three-state, and the crystal oscillator disabled. The clock must meet the same
requirements as above. It is highly recommended that the internal clock be used in
order to ensure that the output video remain within the specifications defined by
the relevant video standard. Any aberration in the source clock is reflected in the
output video and detracts from the quality of the image.

The BY_PLL bit will bypass the PLL, and the encoder clock will be at the
crystal frequency. This bit will take precedence over the EN_XCLK bit.

The second timing generator controls the generation of the HSYNC*,
VSYNC*, BLANK*, and pixel input clocking. This is normally the same clock as
the encoding clock. The EN_ASYNC register bit, if set, will allow this clock to be
driven directly by the CLKI pin. If the DIV2 register bit is set, this internal clock
is divided by two before driving the second timing generator. This is required for
interlaced input to interlaced output mode (i.e., CCIR601 applications).

The CLKI pin is the clock used for synchronizing the pixel inputs (P[23:0])
and any timing input signals (HSYNC*, VSYNC*, and BLANK*) and normally
must be a delayed version of the CLKO pin. It can be directly connected to CLKO
if desired. Data is registered with this input and re-synchronized to the internal
clock. Normally, in muxed input mode, both edges of the CLKI input are used. If
the MODE2X register bit is set, the internal clock is divided by two, allowing a 2x
external clock, and the data to be provided on the rising edge only.

1.3.7 Master and Slave Modes

The device can operate as either a timing master or a slave. In master mode, the
device will generate and output HSYNC*, VSYNC*, and BLANK*. In slave
mode, these must be provided externally. The desired mode is selected by the
SLAVE pin and SLAVER bit.

It is highly recommended that the device operate as a master, to ensure that
the input and output video streams remain synchronized. If the device supplying
the HSYNC* and VSYNC* inputs in slave mode is not correctly programmed, or
the timing varies from that which is required, the output image will lose lock with
the input. By running the device in master mode, any timing errors that occur can
be absorbed to some extent by the on-board FIFO.

1-14 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

1.3.8 Input Formats

The device can convert a wide range of input formats to television video formats.
The input format can be either non-interlaced computer video in 640 x 480 or
800 x 600 formats, or interlaced formats such as CCIR601 formats as well as
most other formats which might be encountered. For detailed information on the
CCIR601 mode, please refer to the “DVD Movie Playback Architecture and
Solutions Application Note”. This application note may be obtained from your
local Conexant Semiconductor sales office.

1.3.9 Pixel Input Timing

The device can accept the input in data either RGB or YCrCb color spaces. Data
can be input either a full pixel at a time, clocked in on the rising edge of CLKI, or
in various multiplexed modes, using both edges of CLKI.

In YCrCb mode, either 24-bit 4:4:4 data or 16-bit 4:2:2 data can be input. In
RGB mode, either 15 bit 5:5:5, 16 bit 5:6:5, or 24-bit RGB can be input. In 16-bit
4:2:2 YCrCb input mode, multiplexed Y, Cr, and Cb data is input through the
P[11:4] inputs. The Y data is input on the falling edge of CLK. The Cr/Cb data is
input on the rising edge of CLK. The Cb/Y/Cr/Y sequence begins at the first
active pixel. In 24-bit 4:4:4 YCrCb input mode, multiplexed Y, Cr, and Cb data is
input through the P[11:0] inputs. The input data is sampled on both the rising and
falling edge of CLK. In RGB input mode, input data is sampled as 12 bits in
24-bit RGB mode or 8 bits in 15/16 bit RGB mode on both the rising and falling
edge of CLK. Tab le 1 -2 shows the assignments of input P[11:0] data on rising
edge and falling edge of CLK.

In addition, all 24-bit modes can utilize a non-multiplexed mode. See Tabl e

1-3 on page 1-5.

TM

Technology 1.3 Circuit Description

1.3.10 Output Modes

The encoder can generate the video as Composite/Y-C, as YUV component, or as
VGA-style RGB. These modes are selected by the OUT_MODE[1:0] register
bits.

When outputting RGB, the device will output VGA/SVGA analog RGB. In
this mode, the R, G, and B input data is fed to the DACs after the addition of sync
and, if the SETUP bit is set, setup. The output currents are scaled so that the
DACs output the proper 1 V full-scale levels for driving a monitor. The graphics
controller provides all the timing control for the monitor, and the device operates
as a slave. Only the P[23:0], BLANK*, HSYNC*, and VSYNC* input pins and
the RGB analog output pins are active. The BLANK*, HSYNC*, and VSYNC*
pins are automatically enabled as inputs in this mode.

Each of the three video signals generated by the OUT_MODE bits can be
multiplexed to any DAC using the OUT_MUXA[1:0], OUT_MUXB[1:0], and
OUT_MUXC[1:0] register bits.

100123B Conexant 1-15

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

TM

Technology

1.3.11 YCrCb Inputs

Y has a nominal range of 16–235; Cb and Cr have a nominal range of 16–240,
with 128 equal to zero. Values of 0 and 255 are interpreted as 1 and 254,
respectively. Y values of 1–15 and 236–254, and CrCb values of 1–15 and
241–254, are interpreted as valid linear values.

Figure 1-4 shows the frequency response of the sub-sampling process. If 4:4:4

data is input, it is sub-sampled to 4:2:2 prior to overscan compensation and flicker
filtering.

Figure 1-4. Decimation Filter at Fs=27 MHz

Chroma Decimation Filter

Decibels (dB)

Freq (Fs=27MHz

The resulting 4:2:2 output must then be converted to YUV values and then
scaled for the output range of the DACs. The MY, MCR, and MCB registers must
be programmed to perform this conversion. The scaling equations are as follows:

MY = (int) [V100/(219.0
MCR = (int)[(128.0/127.0)

0.5]
MCB = (int)[(128.0/127.0)

where:V

= Full scale output voltage (1.28 V)

V

FS

SINX = SIN (2

= 100% white voltage (0.661 V for NTSC, 0.7 V for PAL)

100

πF

SC/FCLK

VFS) * 26 + 0.5]

*

V100 * 0.877/(224.0 * VFS * 0.713 * sinx) * 26 +

*

V100 * 0.493/(224.0 * VFS * 0.564 * sinx) * 26 + 0.5]

*

)/(2πFSC/F

CLK

)

1-16 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

TM

Technology 1.3 Circuit Description

1.3.12 RGB Inputs

With IN_MODE set to 24, 16, or 15-bit RGB mode, digital, gamma-corrected
RGB data with a 0-255 range is input via the P[11:0] inputs in 24-bit RGB mode
or P[11:4] inputs in 15/16-bit RGB mode on both the rising and falling edge of
CLK. The RGB data is converted to Y/R-Y/B-Y as follows:

Y[9:0] = [INT(.299
G[7:0] + INT(.114

The Y/R-Y/B-Y values are then sub-sampled to 4:2:2 data prior to overscan
compensation and flicker filtering.

The resulting 4:2:2 output must then be converted to YUV values and then
scaled for the output range of the DACs. The MY, MCR, and MCB registers must
be programmed to perform this conversion. The scaling equations are as follows:

MY = (int)[V100/(255
MCR = (int)[(128.0/127.0)
MCB = (int)[(128.0/127.0)

where:V
V
SINX = SIN (2

100

= Full scale output voltage (1.28 V)

FS

1.3.13 Video Amplitude Scaling

Both the luminance and chrominance video amplitudes can be scaled by the
MCR, MCB, and MY registers. This allows various colormetry standards to be
achieved, and can also be used to boost the chroma to compensate for the sinX/X
loss of the DACs. Tables 1-7 and 1-8 show the range of values achievable and
values for various video formats.

210) * R[7:0] + INT(.587 * 210) *

*

210)*B[7:0] = 27] * 2–8, 0 to 1024

*

VFS)*26 + 0.5]

*

V100 * 0.877/(127 * VFS * sinx) * 25 + 0.5]

*

V100 * 0.493/(127 * VFS * sinx) * 25 + 0.5]

*

= 100% white voltage (0.661 V for NTSC, 0.7 V for PAL)

πF

SC/FCLK

)/(2πFSC/F

CLK

)

Table 1-7. Video Modes

Mode NTSC NTSC-Japan PAL-BDGHI PAL-N PAL-Nc PAL-M PAL-60

VSYNC_DUR 1 1 0 1 0 1 1

625LINE 0 0 1 1 1 0 0

SETUP 1 0 0 1 0 1 0

PAL 0 0 1 1 1 1 1

100123B Conexant 1-17

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

TM

Technology

Table 1-8. Video Levels

Mode Range N T S C

100% White Amp (V) 0.661 0.714 0.7 0.661 0.7 0.661 0.7

Sync Amp (V) 0.286 0.286 0.301 0.286 0.301 0.286 0.301

Subcarrier Amp (V) 0.286 0.286 0.3 0.3 0.3 0.306 0.306

YCrCb Input MY 0–255 153 158 158 153 158 153 158

MCR 0-255 187 207 207 187 207 187 207

MCB 0-255 133 149 149 133 149 133 149

RGB Input MY 0–255 133 143 141 133 141 133 141

MCR 0-255 117 127 124 117 124 117 124

MCB 0-255 66 71 70 66 70 66 70

SYNC_AMP 0–255 225 225 238 225 238 225 238

BST_AMP 0–255 114 114 90 90 90 92 92

NTSC-

Japan

PALBDGHI PAL-N PAL-Nc PAL-M PAL-60

1.3.14 Input Pixel Horizontal Sync

The HSYNC* pin provides the pixel synchronization for the pixel input data. It is
an output in master mode, and an input in slave mode. In master mode, it is a
pulse two CLK cycles in duration whose leading edge indicates the beginning of a
new line of pixel data. The period of the pulses is H_CLKI CLK cycles. The first
pixel should be presented to the device H_BLANKI minus the internal pipelined
clock (in CLK cycles) after a leading edge of HSYNC*. The next H_ACTIVE
pixels will be accepted as active pixels and used in the construction of the output
video. In slave mode, the period must be exactly the number of clocks required
for the desired overscan mode. Only the leading edge is used, and the high and
low times must be at least two CLK cycles in duration. HSYNC* is clocked by
the rising edge of CLKI. HSYNCI is clocked by the rising edge of CLKI.

The polarity of the HSYNC* pin can be programmed by the HSYNCI register
bit. The default convention is active low.

1-18 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

TM

Technology 1.3 Circuit Description

1.3.15 Input Pixel Vertical Sync

The VSYNC* pin provides the line synchronization for the pixel input data. It is
an output in master mode, and an input in slave mode.

For non-interlaced input timing in master mode, VSYNC* is a pulse one
horizontal line time in duration whose leading edge indicates the beginning of a
frame of input pixel data. The leading edge coincides with the leading edge of
HSYNC*. The period of the pulses is V_LINESI horizontal lines. The first line of
data should be presented to the device V_BLANKI lines after the leading edge of
VSYNC*. The next V_ACTIVEI lines are accepted as active lines and used in the
construction of the output video. In slave mode, the period must be exactly the
frame rate of the desired video format. Only the leading edge is used, and the high
and low duration must be at least two CLK cycles. The beginning of the frame of
data is indicated by the next leading edge of HSYNC* coincident with or after the
leading edge of VSYNC*.

For interlaced input timing, only slave mode is supported. The period must be
exactly the frame rate of the desired video format. If the leading edge of
HSYNC* and VSYNC* are coincident, which indicates the input is in odd field,
the internal line counter is reset to line 1 at the leading edge of VSYNC*. If the
leading edges of HSYNC* and VSYNC* are not coincident, which indicates the
input is in even field, the internal line counter will be reset to line 2 at the
beginning of the next line. Only the leading edge of VSYNC* is used, and the
high and low duration must be at least two CLK cycles. VSYNC* is clocked by
the rising edge of CLKI.

The polarity of the VSYNC* output can be programmed by the VSYNCI
register bit. The default convention is active low.

1.3.16 Input Pixel Blanking

The input pixel blanking can be controlled by either the BLANK* pin or by the
internal registers. It can be programmed independently of master/slave mode
using the EN_BLANKO register bit. In output mode (EN_BLANKO=1), the
pixel blanking is generated based on the active area defined by the H_BLANKI,
H_ACTIVE, V_BLANKI, and V_ACTIVEI registers, and the BLANK* pin will
be output in the proper relationship to the syncs to indicate the active pixels. In
input mode (EN_BLANKO=0), when the BLANK* pin goes high, it will indicate
start of active pixels at the pixel input pins. The duration of active pixel is still
determined by the H_ACTIVE register. BLANK* is clocked by the rising edge of
CLKI.

An additional function for the BLANK* pin is used if the EN_DOT register
bit is set. In this mode, the internally-generated blanking is used. The BLANK*
pin becomes an input whose rising edge defines the graphics controller character
clock boundary. This is used internally by the encoder to keep track of the exact
pixel count for controllers that cannot operate at pixel clock rates but instead
operate at VGA character clock rates.

100123B Conexant 1-19

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

TM

Technology

1.3.17 Overscan Compensation and Flicker Filtering

The resulting subsampled and optionally color-space-converted pixel data is
processed by the overscan compensation and flicker filtering logic. This process
converts the lines of input pixel data to the appropriate number of output lines for
producing a full-screen image on the television receiver. The image, which is
100% within the viewable area of the screen (overscan compensated), can
perform vertical filtering to reduce the effects of picture flicker due to the
interlacing of the output image. The amount of flicker filtering is programmable,
because this process trades off vertical resolution in order to reduce the flicker,
and allows the process to be optimized for the image. Horizontal scaling is
achieved by adjusting the encoder clock rate. No additional horizontal processing
is performed on the input pixels. This allows the full bandwidth of the input
image to be output, limited only by the 2x upsampling filter response, which is
nominally greater than 6 MHz.

The device can accept a wide variety of input image formats, from 640x480 to
800x600, and can output all NTSC and PAL video formats.

Figures A-1 through A-4 in Appendix A show the possible ranges of overscan

compensation for 640x480 and 800x600 NTSC and PAL formats, for graphics
controllers with synchronization resolutions of 1, 8, and 9 pixel clocks, using a
horizontal blanking interval of 20 pixel clocks. Tables A- 3 through A-10 show
representative values for the following:

• Input picture and frame and output picture and field sizes for 640x480 and
800x600 input picture size

• NTSC and PAL outputs using a horizontal blanking interval of 2.5

The DIS_FFILT register bit disables the flicker filter. The vertical scaling
should also be disabled by setting the VSCALE register to 4096 for
non-interlaced input, or 0 for interlaced input.

CONFIG[2:0] This field determines the configuration for the

automatic configuration process.
000 = NTSC 640 x 480 RGB input
001 = PAL 640 x 480 RGB input
010 = NTSC 800 x 600 RGB input
011 = PAL 800 x 600 RGB input
100 = NTSC 640 x 480 YCrCbYCrCb input
101 = PAL 640 x 480 YCrCb input
110 = NTSC 800 x 600 YCrCb input
111 = PAL 800 x 600 YCrCb input

LUMADLY[1:0] This 2-bit value can be used to program the luminance

delay in pixels for the CVBS_DLY and Y_DLY
output modes.
00 = no delay
01 = 1 pixel
10 = 2 pixels
11 = 3 pixels

µs.

1-20 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

1.3.18 VGA Compatibility

To achieve VGA compatibility, the controller must manipulate the VGA register
settings in order to produce a consistent output timing for all VGA modes. The
encoder has no way of knowing that a different VGA mode has been selected, and
therefore cannot make any adjustments to the timing. The extent of VGA
compatibility is entirely the controller’s responsibility.

1.3.19 Analog Horizontal Sync

The duration of the horizontal sync pulse is determined by the horizontal sync
width register (HSYNC_WIDTH[7:0]). The beginning of the horizontal sync
pulse corresponds to the reset of the internal horizontal pixel counter. The
horizontal line rate is determined by H_CLKI[11:0]. The internal horizontal
counter is reset to 1 at the beginning of the horizontal sync and counts up to
H_CLKI.

The sync rise and fall times are automatically controlled. The sync amplitude
is programmable over a range of values by SYNC_AMP[7:0]. Tab le 1 -8 lists the
range of sync values obtainable and the preferred values for various video
formats.

TM

Technology 1.3 Circuit Description

1.3.20 Analog Vertical Sync

The duration of the vertical sync is selectable as either 2.5 or 3 lines by register bit
VSYNC_DUR. If VSYNC_DUR = 0, 3 lines are selected; if VSYNC_DUR = 1,

2.5 lines are selected. The duration of the serration and equalization pulses are 1/2
the duration of the horizontal sync duration.

1.3.21 Analog Video Blanking

Analog video blanking is controlled by the H_BLANKO, V_BLANKO, and
V_ACTIVEO registers. Together they define an active region where pixels will be
displayed. V_BLANKO defines the number of lines from the leading edge of the
analog vertical sync to the first active output lines, per field; V_ACTIVEO
defines the number of active output lines. H_BLANKO defines the number of
output pixels from the leading edge of horizontal sync to the first active output
pixel; H_BLANKO defines the number of active output pixels.

The device will automatically blank the video from the start of the horizontal
sync interval through the end of the burst, as well as the vertical sync to prevent
erroneous video timing generation.

1.3.22 Video Standards

There are several bits (625LINE, SETUP, and VSYNC_DUR) and a PAL pin that
control the generation of various video standards. (These are summarized in

Table A -1 .) They allow the generation of all the NTSC and PAL video standards.

These bits control the specific encoding process parameter, and other registers
may also need to be modified to meet all the video parameters of the particular
video standard. Video timing diagrams are illustrated in Figures 1-5 through 1-13,
which summarize all the common video standards and the required register values
for typical input formats.

100123B Conexant 1-21

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

Figure 1-5. Interlaced 525-Line (NTSC) Video Timing

RESET*

Start

Analog
FIELD 1

of

VSYNC

TM

Technology

525524523

Analog
FIELD 2

Analog
FIELD 3

525524523

3

21

BURST PHASE

321

BURST PHASE

89

272271270269268267263262261 266265264

89

10

10

227654

285

227654

Analog
FIELD 4

272271270269268267263262261 266265264 285

Burst Begins with Positive Half-Cycle
Burst Phase = Reference Phase = 180° Relative to B–Y

Burst Begins with Negative Half-Cycle
Burst Phase = Reference Phase = 180° Relative to B–Y

NOTE(S): SMPTE line numbering convention is used rather than CCIR624.

1-22 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Figure 1-6. Interlaced 525-Line (PAL-M) Video Timing

Analog
FIELD 1

TM

Technology 1.3 Circuit Description

RESET*

Start

of

VSYNC*

525524523

Analog
FIELD 2

Analog
FIELD 3

525524523

Analog
FIELD 4

3

21

Burst Phase

321

Burst Phase

7654

89

272271270269268267263262261 266265264

89

272271270269268267263262261 266265264

10

10

273

273

11

11

12

274

12

274

227654

285

22

285

Burst Phase = Reference Phase = 135° Relative to U
PAL Switch = 0, +V Component

Burst Phase = Reference Phase + 90° = 225° Relative to U
PAL Switch = 1, –V Component

100123B Conexant 1-23

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

Figure 1-7. Interlaced 625-Line (PAL–B, D, G, H, I, Nc) Video Timing (Fields 1–4)

RESET*

Start

of

VSYNC

Analog
FIELD 1

TM

Technology

Burst
Blanking
Intervals

310 313

309 318310

625624623 23

21622621620

– U PHASE

Analog
FIELD 2

Analog
FIELD 3

Analog
FIELD 4

319

FIELD One

FIELD Two

FIELD Three

2476543

337320318317316315314309308 312311 336

247654321622621620 625624623 23

337320317316315314308 313312311 336319

FIELD Four

Burst Phase = Reference Phase = 135° Relative to U
PAL Switch = 0, +V Component

Burst Phase = Reference Phase + 90° = 225° Relative to U
PAL Switch = 1, –V Component

1-24 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Figure 1-8. Interlaced 625-Line (PAL–B, D, G, H, I, Nc) Video Timing (Fields 5–8)

TM

Technology 1.3 Circuit Description

RESET*

Start

of

VSYNC

Analog
FIELD 5

Burst
Blanking

Intervals

310 313

309 318310

625624623 23

21622621620

– U PHASE

Analog
FIELD 6

Analog
FIELD 7

Analog
FIELD 8

FIELD Five

FIELD Six

FIELD Seven

2476543

337320318317316315314309308 312311 336319

247654321622621620 625624623 23

337320317316315314308 313312311 336319

FIELD Eight

Burst Phase = Reference Phase = 135° Relative to U
PAL Switch = 0, +V Component

Burst Phase = Reference Phase + 90° = 225° Relative to U
PAL Switch = 1, –V Component

100123B Conexant 1-25

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

Figure 1-9. Interlaced 625-Line (PAL–N) Video Timing (Fields 1–4)

VSYNC*

Analog
FIELD 1

RESET*

– U PHASE

Analog
FIELD 2

TM

Technology

247654321622621620 625624623 23

Burst

Blanking

Intervals

310 313 319

Analog
FIELD 3

622

Analog
FIELD 4

310309

FIELD One

FIELD Two

FIELD Three

FIELD Four

Burst Phase = Reference Phase = 135° Relative to U
PAL Switch = 0, +V Component

Burst Phase = Reference Phase + 90° = 225° Relative to U
PAL Switch = 1, –V Component

318 319

337320318317316315314309308 312311 336

6

24754321621620 625624623 23

337320317316315314308 313312311 336

1-26 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Figure 1-10. Interlaced 625-Line (PAL–N) Video Timing (Fields 5–8)

TM

Technology 1.3 Circuit Description

VSYNC*

Analog
FIELD 5

Burst
Blanking
Intervals

310 313

309 318310

21622621620 625624623 23

– U PHASE

Analog
FIELD 6

Analog
FIELD 7

Analog
FIELD 8

FIELD Five

FIELD Six

FIELD Seven

2476543

337320318317316315314309308 312311 336319

247654321622621620 625624623 23

337320317316315314308 313312311 336319

FIELD Eight

Burst Phase = Reference Phase = 135° Relative to U
PAL Switch = 0, +V Component

Burst Phase = Reference Phase + 90° = 225° Relative to U
PAL Switch = 1, –V Component

100123B Conexant 1-27

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

Figure 1-11. Noninterlaced 262-Line (NTSC) Video Timing

START

of

VSYNC

TM

Technology

21262261

FIELD 1

START

of

VSYNC

263524523 268267266265264 272271270269

FIELD 2

Burst Begins with Positive Half-Cycle
Burst Phase = Reference Phase = 180° Relative to B-Y

Burst Begins with Negative Half-Cycle
Burst Phase = Reference Phase = 180° Relative to B-Y

Figure 1-12. Noninterlaced 262-Line (PAL–M) Video Timing

START

of

VSYNC

10 219876543

285

21525524

FIELD 1

START

of

VSYNC

266265264263262 274

FIELD 2

Burst Begins with Positive Half-Cycle
Burst Phase = Reference Phase = 180° Relative to B-Y

Burst Begins with Negative Half-Cycle
Burst Phase = Reference Phase = 180° Relative to B-Y

1-28 Conexant 100123B

10 219876543

273

11

12

285272271270269268267

Bt868/Bt869 1.0 Functional Description

Start

of

VSYNC

TM

Technology 1.3 Circuit Description

RESET*

Flicker-Free Video Encoder with Ultrascale

Figure 1-13. Noninterlaced 312-Line (PAL–B, D, G, H, I, N, Nc) Video Timing

Burst Phase = Reference Phase = 135° Relative to U
PAL Switch = 0, +V Component

Burst Phase = Reference Phase + 90° = 225° Relative to U
PAL Switch = 1, –V Component

1.3.23 Subcarrier Generation

The device uses a 32-bit-word to synthesize the subcarrier. The value of the
subcarrier increment required to generate the desired subcarrier frequency is
found with the following equation:

MSC[31:0] = (int) (2

or more directly, for NTSC:

MSC[31:0] = 2

and for PAL:

MSC[31:0] = 2

23 4

32

F

/ F

sc

*

32

* [455 * / (2 * H_CLKO)]

32

* [(1135/4 + 1/625) / (H_CLKO)]

+ 0.5)

clk

237651312311310309308

24

237651312311310309308 23 4 24

where F
subcarrier to enable the generation of any desired video standard. The 32-bit
subcarrier increment MSC[31:0] must be loaded by the serial interface before the
subcarrier can be enabled. The device is reset to disable chroma until the last byte
of the 32-bit increment is loaded, at which time the chroma will be enabled, unless
the DCHROMA bit is set.

(Discrete Time Oscillator) is reset every four fields for NTSC formats and every
eight fields for PAL formats.

100123B Conexant 1-29

is the encoder clock rate. This allows the generation of any desired

clk

In order to prevent any residual errors from accumulating, the subcarrier DTO

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

TM

Technology

1.3.24 Burst Generation

The subcarrier burst generation is a function of the video standard (e.g. NTSC or
PAL), the subcarrier frequency increment (MSC[31:03]), and the burst horizontal
begin and end register settings (HBURST_BEGIN[7:0] and
HBURST_END[7:0]). The value of HBURST_BEGIN[7:0] and
HBURST_END[7:0] is the desired pixel minus a value of 128. The burst will
automatically be blanked during the horizontal sync to prevent invalid sync pulses
from being generated. The burst blanking is automatically controlled by the
selected video format. The burst rise and fall times are automatically generated by
the device.

The burst amplitude can be programmed by BST_AMP[5:0]. Tabl e 1-8 shows
the ranges of burst values obtainable and the preferred values for various video
formats.

1.3.25 Chrominance Disable

The chrominance subcarrier can be turned off by setting the DCHROMA bit to a
logical 1. This kills burst as well, providing luminance-only signals on the CVBS
output and a static blank level on the C/R output.

1.3.26 Digital Processing

Once the input data is converted into internal YUV format, the UV components
are low-pass filtered with a filter response illustrated in Figure 1-14 (linearly
scalable by clock frequency). The Y and filtered UV components are upsampled
to CLK frequency by a digital filter whose response is illustrated in Figure 1-15.

Figure 1-14. Three-Stage Chroma Filter

5

0

– 5

– 10

– 15

– 20

Attenuation dB

– 25

– 30

– 35

– 40

0

1-30 Conexant 100123B

0.5 1 1.5 2
Frequency MHz
CLK = 27 MHz

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

Figure 1-15. Luminance Upsampling Filter Response

TM

Technology 1.3 Circuit Description

5

0

– 5

– 10

– 15

– 20

Attenuation dB

– 25

– 30

– 35

– 40

061224 810

Frequency MHz
(Internal Encoder CLK = 27 MHz)

1.3.27 Subcarrier Phasing

In order to maintain correct SC-H phasing, subcarrier phase is set to 0 on the
leading edge of the analog vertical sync every four (NTSC) or eight (PAL) fields,
unless the DIS_SCRESET bit is set to a logical 1. This is true for both interlaced
and non-interlaced outputs. The subcarrier phase can be adjusted from the
nominal 0 phase by the PHASE_OFF[7:0] register, where each LSB change
corresponds to a 360/256 degree change in the phase.

Setting DIS_SCRESET to 1 may be useful in situations where the ratio of
CLK/2 to HSYNC* edges in a color frame is noninteger, which could produce a
significant phase impulse by resetting to 0.

1.3.28 Noninterlaced Operation

When the Bt868/869 is programmed for noninterlaced master mode, it always
displays the odd field. FIELD will change state on the leading edge of the analog
vertical sync. A 30 Hz offset should be subtracted from the color subcarrier
frequency while in NTSC mode so that the color subcarrier phase will be inverted
from field to field. Transition from interlaced to noninterlaced in master mode
occurs during odd fields to prevent synchronization disturbance.

NOTE: Consumer VCRs can record noninterlaced video with minor noise

artifacts, but special effects (e.g., scan > 2x) may not function properly.

100123B Conexant 1-31

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

1.3.29 Closed Captioning

The Bt868/869 encodes NTSC/PAL–M closed captioning on scan line 21, and
NTSC/PAL–M extended data services on scan line 284. Four 8-bit registers
(CCF1B1, CCF1B2, CCF2B1, and CCF2B2) provide the data while bits ECCF1
and ECCF2 enable display of the data. A logical 0 corresponds to the blanking
level of 0 IRE, while a logical 1 corresponds to 50 IRE above the blanking level.

Closed captioning for PAL–B, D, G, H, I, N, Nc is similar to that for NTSC.
Closed-caption (CC) encoding is performed for 625-line systems according to the
system proposed by the National Captioning Institute; clock and data timing is
identical to that of NTSC system, except that encoding is provided on lines 22
and 335, for closed captioning and extended data services respectively.

The Bt868/869 generates the clock run-in and appropriate timing
automatically. Pixel inputs are ignored during CC encoding. See FCC Code of
Federal Regulations (CFR) 47 Section 15.119 (10/91 edition or later) for
programming information. EIA608 describes ancillary data applications for Field
2 Line 21 (line 284).

When CCF1B2 is written, CCSTAT_O is set; when CCF2B2 is written,
CCSTAT_E is set. After the CC bytes for the odd field are encoded, CCSTAT_O
is cleared; after the CC bytes for the even field are encoded, CCSTAT_E is
cleared. If the ECCGATE bit is set, no further encoding will be performed until
the appropriate registers are again written; a null will be transmitted on the
appropriate CC line in that case. If the ECCGATE bit is not set, the user must
rewrite the CC registers prior to reaching the CC line; otherwise the last bytes will
be re-encoded. The CC data bytes are double-buffered to prevent loss of data
during the encoding process.

TM

Technology

1.3.30 Internal Color Bars

The Bt868/869 can be configured to generate 100% amplitude, 75% saturation
(100/7.5/75/7.5 for NTSC/PAL-M with setup, 100/0/75/0 for PAL) color bars.
Color bars can be enabled or disabled by setting the ECBAR bit to a logical 1. The
device uses the H_BLANKO register value to determine the starting point of the
color bars, and the H_ACTIVE register value to determine the width. Eight bars
are displayed, with the colors and amplitudes being generated internally. The pixel
inputs are ignored in color bar mode. The MY, MCR, and MCB registers must be
programmed for RGB inputs prior to color bar operation.

1.3.31 Macrovision Encoding

The Bt869 device supports Version 7.xx of the Macrovision specification for
copy protection for all NTSC and PAL modes. The Bt868 does not support the
Macrovision feature.

1-32 Conexant 100123B

Bt868/Bt869 1.0 Functional Description

Flicker-Free Video Encoder with Ultrascale

1.3.32 Outputs

There are four modes for the analog outputs, selected by OUT_MODE[1:0]. The
first mode (OUT_MODE=0) generates Composite video (CVBS), Luma (Y),
Chroma (C), and Delayed Luma (Y_DLY). The second mode (OUT_MODE=1)
generates Luma-Delayed Composite video (CVBS_DLY), Luma (Y), Chroma
(C), and Delayed Luma (Y_DLY). The third mode (OUT_MODE=2) generates
Component YUV and Delayed Luma (Y_DLY). The fourth mode
(OUT_MODE=3) generates VGA-style RGB outputs. The LUMADLY[1:0]
register bits control the amount of delay for the delayed luma, from 0 to 3 pixel
clocks. For each mode, any of the four generated outputs can be muxed to any of
three output DACs by the register bits OUT_MUXA[1:0], OUT_MUXB[1:0],
and OUT_MUXC[1:0]. All digital-to-analog converters are designed to drive
standard video levels into a combined RLOAD of 37.5

Ω). Unused outputs should be disabled by setting the corresponding

75
DACDISX bit to minimize supply current, or connected directly to ground to
minimize supply switching currents.

1.3.33 Output Connection Status

TM

Technology 1.3 Circuit Description

Ω (doubly-terminated

The device can determine whether or not the DAC output is connected to a
monitor by verifying that the output is doubly-terminated. The MONSTATx bit
for the corresponding DAC is set to a 1 if the device senses a doubly-terminated
load on a reset condition or if the CHECK_STAT register bit is set. While
CHECK_STAT is set, the output is forced to 2/3 of VREF when terminated and
4/3 of VREF if unterminated. The MONSTATx bit reflects the condition when the
DAC output is less than or equal to VREF. The CHECK_STAT bit is
automatically cleared after two clock cycles.

1.3.34 Output Filtering and SINX/X Compensation

The DAC output response is a typical sinx/x response. For the composite video
output, this results in a slightly lower than desired burst and chroma amplitude
value. This can be compensated for, to some extent, by choosing an output filter
which boosts higher frequency response slightly. Another method which can be
used effectively, and is used by default in the auto configuration modes, is to
boost the burst and chroma gain as programmed by the BST_AMP and
MCR/MCB register values by x/sinx. The amount of sinx/x amplitude reduction
is calculated by:

π

sinx/x = sin (

Fsc/Fclk) / (π * Fsc/Fclk)

*

100123B Conexant 1-33

1.0 Functional Description Bt868/Bt869

1.3 Circuit Description Flicker-Free Video Encoder with Ultrascale

1.3.35 Power-Down Modes

The device can be placed in a low-power mode by the SLEEP pin. In this mode,
the analog circuitry is shut down, disabling the output video, and the internal
clock to the device is held constant, placing both the analog and digital current
draw to a minimum. Register states are preserved, but other chip functionality
(including the serial interface) is disabled. This mode achieves the greatest
reduction in power.

In addition, the entire analog subsection can be powered-down with the
DACOFF bit, allowing digital operations to continue while reducing the power in
the analog circuitry. This will achieve a significant reduction in power while
maintaining all digital functionality. Each individual DAC can also be powered
down by its corresponding DACDISx bit. This is useful only if some of the DACs
are being used, in order to minimize the power in the system.

1.3.36 Serial Interface

The device includes a 2-wire serial interface which is used for programming the
registers in the device. The interface is designed to operate with either 3.3 V or
5 V input levels by changing the supply voltage for the input and output drivers
with the VDD_SI pin.

TM

Technology

1-34 Conexant 100123B

2.0 Internal Registers

A register bit map is displayed in Tabl e 2-1 , and a read-back bit map is displayed
in Tabl e 2- 2. Bit descriptions and detailed programming information follow the
bit map. All registers are write-only and are set to 0 following a software reset. A
software reset is always performed at power-up; after power-up, a reset can be
triggered by writing the SRESET register bit.

Table 2-1. Register Bit Map (1 of 3)

2

8-Bit

Address

6C TIMING RESET RESERVED

6E HSYNOFFSET[7:0]

70 HSYNOFFSET[9:8] HSYNWIDTH[5:0]

72 VSYNOFFSET[7:0]

74 DATDLY DATSWP

76 H_CLKO[7:0]

78 H_ACTIVE[7:0]

7A HSYNC_WIDTH[7:0]

7C HBURST_BEGIN[7:0]

7E HBURST_END[7:0]

80 H_BLANKO[7:0]

82 V_BLANKO[7:0]

84 V_ACTIVEO[7:0]

86 V_ACTIVEO[8]

88 H_FRACT[7:0]

D7 D6 D5 D4 D3 D2 D1 D0

VSYNOFFSET[10:8]

Reserved H_ACTIVE[9:8] H_CLKO[11:8]

VSYNWIDTH[2:0]

8A H_CLKI[7:0]

8C H_BLANKI[7:0]

8E Reserved

90 V_LINESI[7:0]

92 V_BLANKI[7:0]

94 V_ACTIVEI[7:0]

96 CLPF[1:0]

100123B Conexant 2-1

Reserved Reserved VBLANKDLY H_BLANKI[8] H_CLKI[10:8]

YLPF[1:0] V_ACTIVEI[9:8] V_LINESI[9:8]

2.0 Internal Registers Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table 2-1. Register Bit Map (2 of 3)

TM

Technology

8-Bit

Address

98 V_SCALE[7:0]

9A H_BLANKO[9:8]

9C PLL_FRACT[7:0]

9E PLL_FRACT[15:8]

A0 EN_XCLK

A2 Reserved ECLIP PAL_MD DIS_SCRESET VSYNC_DUR625LINE SETUP NI_OUT

A4 SYNC_AMP[7:0]

A6 BST_AMP[7:0]

A8 MCR[7:0]

AA MCB[7:0]

AC MY[7:0]

AE MSC[7:0]

B0 MSC[15:8]

B2 MSC[23:16]

B4 MSC[31:24]

B6 PHASE_OFF[7:0]

B8 EN_PINCFG CONFIG[2:0]

D7 D6 D5 D4 D3 D2 D1 D0

V_SCALE[13:8]

BY_PLL PLL_INT[5:0]

BA SRESET CHECK_STAT SLAVER DACOFF Reserved DACDISCDACDISB DACDISA

BC CCF2B1[7:0]

BE CCF2B2[7:0]

C0 CCF1B1[7:0]

C2 CCF1B2[7:0]

C4 ESTATUS[1:0] ECCF2 ECCF1 ECCGATE ECBAR DCHROMAEN_OUT

C6 EN_BLANKO EN_DOT FIELDI VSYNCI HSYNCI IN_MODE[2:0]

C8 DIS_YFLPF DIS_FFILT F_SELC[2:0] F_SELY[2:0]

CA DIS_GMUSHY DIS_GMSHY YCORING[2:0] YATTENUATE[2:0]

CC DIS_GMUSHC DIS_GMSHC CCORING[2:0] CATTENUATE[2:0]

CE Reserved OUT_MUXC[1:0] OUT_MUXB[1:0] OUT_MUXA[1:0]

D0 CCR_START[7:0]

D2 CC_ADD[7:0]

D4 MODE2X DIV2 EN_ASYNC CCR_START[8] CC_ADD[11:8]

2-2 Conexant 100123B

Bt868/Bt869 2.0 Internal Registers

Flicker-Free Video Encoder with Ultrascale

Table 2-1. Register Bit Map (3 of 3)

TM

Technology 2.1 Essential Registers

8-Bit

Address

D6 Reserved Reserved Reserved Reserved OUT_MODE[1:0] LUMADLY[1:0]

D8 Reserved

D7 D6 D5 D4 D3 D2 D1 D0

2.1 Essential Registers

The power-up state is defined to be black burst CCIR601 NTSC video. To enable
active video, the EN_OUT register bit must be set. This bit enables CLKO,
HSYNC*, VSYNC*, BLANK*, and FIELD outputs. If this bit is not set, then
these pins are set to a high impedance.

2.2 Writing Addresses

Following a start condition, writing 0x88 initiates access to subaddresses.
Alternative address 0x8A must be written if the ALTADDR pin is high. If the data
is written in subaddress order, only the beginning subaddress needs to be written;
the internal address counter will automatically increment after each write to a
register.

2.3 Reading Information

Following a start condition, writing 0x89 initiates the read-back sequence, during
which 8 bits of information can be read from the SID pin, MSB first. Alternative
address 0x8B is required if the ALTADDR pin is high. For the case of
ESTATUS[1:0]=00 prior to the read sequence, the first three bits indicate the part
type (Bt868 or Bt869). The lower f ive bits indicate the version number or the
status bits. The instances where ESTATUS[1:0]=01 and ESTATUS[1:0]=10, the
bits read back from the VGA Encoder will contain information as specified by

Table 2 -2.

For software detection of a connected TV monitor on each DAC output,
ESTATUS[1:0] must equal 01 and the MONSTAT x bits should be read
accordingly after writing to CHECK_STAT.

Data details are defined in Ta ble 2 -3 ; bit and register definitions are displayed
in Tabl e 2- 4.

100123B Conexant 2-3

2.0 Internal Registers Bt868/Bt869

2.3 Reading Information Flicker-Free Video Encoder with Ultrascale

Table 2-2. Read-Back Bit Map

ESTATUS[1:0] 7 6 5 4 3 2 1 0

00 ID[2:0] VERSION[2:0]

TM

Technology

01

10 PLL_LOCK FIFO_OVER FIFO_UNDER PAL BUSY

Table 2-3. Data Details Defined

Bit Names Data Definition

ID[2:0] Indicates the part number: 000 is returned from the Bt868; 001 is returned from the Bt869.

VERSION[4:0] Version number; for this revision, these bits are 00001.

MONSTAT_A Monitor connection status for DACA output, 1 denotes monitor connected to DACA.

MONSTAT_B Monitor connection status for DACB output, 1 denotes monitor connected to DACB.

MONSTAT_C Monitor connection status for DACC output, 1 denotes monitor connected to DACC.

CCSTAT_E

CCSTAT_O

FIELD[2:0] Field number, where 000 indicates the first field, 111 indicates the 8th field.

PLL_LOCK High when PLL is locked.

MONSTAT_

A

High if closed-caption data has been written for the even field; it is low immediately after the clock run-in on
line 21(NTSC) or 22(PAL).

High if closed-caption data has been written for the odd field; it is low immediately after the clock run-in on
line 284(NTSC) or 335(PAL).

MONSTAT_B MONSTAT_C CCSTAT_E CCSTAT_O FIELD[2:0]

FIFO_OVER Set to one if FIFO overflows. Reset on read.

FIFO_UNDER Set to one if FIFO underflows. Reset on read.

PAL Indicates status of PAL pin.

BUSY

Table 2-4. Programming Detail (1 of 7)

Bit/Register Names Bit/Register Definition

H_CLKO[11:0] Number of output CLKs/line

H_ACTIVE[9:0] Number of active input and output pixels

HSYNC_WIDTH[7:0] Analog sync width in clocks

HBURST_BEGIN[7:0] Beginning of burst 50% point in number of clock cycles from analog hsync falling edge

HBURST_END[7:0] End of burst 50% point in number of clock cycles—128 from analog sync falling edge

H_BLANKO[9:0] Number of output CLKs between leading edge of horizontal sync and active video

V_BLANKO[7:0] Line number of first active line (number of blank lines + 1)

V_ACTIVEO[8:0] Number of active output lines/field

Indicates that the device is in the process of initializing the registers and that the registers cannot be written.
This bit remains high for 512 CLK-0 after an auto configuration cycle begins.

2-4 Conexant 100123B

Bt868/Bt869 2.0 Internal Registers

Flicker-Free Video Encoder with Ultrascale

Table 2-4. Programming Detail (2 of 7)

Bit/Register Names Bit/Register Definition

H_FRACT[7:0] Fractional number of input clocks per line

H_CLKI[10:0] Number of clocks per line between successive HSYNC* edges

H_BLANKI[8:0] Number of input pixels between HSYNC* leading edge and first active pixel

VBLANKDLY If set, the effective vertical blanking value in the second field is V_BLANKI+1.

V_LINESI[9:0] Number of vertical input lines

V_BLANKI[7:0] Number of input lines between VSYNC* leading and first active line

V_ACTIVEI[9:0] Number of active input lines

CLPF[1:0] Chroma Horizontal Low Pass Filter

00 = Bypass
01 = Reserved
10 = Chroma Horizontal LPF2
11 = Chroma Horizontal LPF3

YLPF[1:0] Luma Post-FlickerFilter/Scaler Horizontal Low Pass Filter

TM

Technology 2.3 Reading Information

00 = Bypass
01 = Luma Horizontal LPF1
10 = Luma Horizontal LPF2
11 = Luma Horizontal LPF3

V_SCALE[13:0] Vertical scaling coefficient

PLL_FRACT[15:0] Fractional portion of PLL multiplier

PLL_INT[5:0] Integer portion of PLL multiplier

EN_XCLK

BY_PLL

Reserved Reserved for future software compatibility; should be set to zero for normal operation.

ECLIP

PAL_MD

DIS_SCRESET

0 = Encoder generates pixel clock
1 = Use CLKI pin as pixel clock source

0 = Use PLL
1 = Bypass PLL (encoder clock is crystal frequency)

0 = Normal operation
1 = Enable clipping; DAC values less than 31 are made 31

Video output switch bit. If PAL pin = 0, this controls analog output format
0 = Changes video output to NTSC mode

1 = Changes video output to PAL mode (even if PAL pin = 0)

0 = Normal operation. The subcarrier phase is reset to 0 at the beginning of each color field

sequence

1 = Disables subcarrier reset event at beginning of field sequence

VSYNC_DUR

625LINE

SETUP

NI_OUT

100123B Conexant 2-5

0 = Generates 2.5-line VSYNC analog output
1 = Generates 3-line VSYNC analog output

0 = 525-line format
1 = 625-line format

1 = Setup on. The 7.5–IRE setup is enabled for active video lines.
0 = Setup off. The 7.5–IRE setup is disabled for active video lines.

0 = Interlaced analog video output
1 = Noninterlaced analog video output

2.0 Internal Registers Bt868/Bt869

2.3 Reading Information Flicker-Free Video Encoder with Ultrascale

Table 2-4. Programming Detail (3 of 7)

Bit/Register Names Bit/Register Definition

SYNC_AMP[7:0] Multiplication factor for sync amplitude

BST_AMP[7:0] Burst amplitude multiplication factor

MCR[7:0] Multiplication factor for CR (or R-Y) component prior to subcarrier modulation

MCB[7:0] Multiplication factor for CB (or B-Y) component prior to subcarrier modulation

MY[7:0] Multiplication factor for Y component

MSC[31:0] Subcarrier increment

PHASE_OFF[7:0] Subcarrier phase offset

TM

Technology

EN_PINCFG

CONFIG[2:0]

SRESET

CHECK_STAT

DACOFF

DACDISC

DACDISB

When set, this will enable the auto configuration to be controlled by P[23:21]. Whenever a change
is detected on these pins, the mode is reconfigured.

This field determines the configuration for the automatic configuration process

000 = NTSC 640x480 RGB input
001 = PAL 640x480 RGB input
010 = NTSC 800x600 RGB input
011 = PAL 800x600 RGB input
100 = NTSC 640x480 YCrCb input
101 = PAL 640x480 YCrCb input
110 = NTSC 800x600 YCrCb input
111 = PAL 800x600 YCrCb input

Writing a 1 to this bit performs a software reset; all registers are reset to 0s unless the
CONFIG[2:0] field is non-0; in that case, the automatic configuration process is begun and the
BUSY status bit is set. This bit is automatically cleared.

Writing a 1 to this bit checks the status of the monitor connections at the DAC output. This is also
automatically performed on any reset condition, including a software reset. This bit is automatically
cleared.

0 = Normal operation
1 = Disables DAC output current and internal voltage reference. This will limit power consumption

to just the digital circuits.

0 = Normal operation
1 = Disables DAC output. Current is set to 0; output will go to 0 V.

0 = Normal operation
1 = Disables DACB output. Current is set to 0; output will go to 0 V.

DACDISA

CCF2B1[7:0]

CCF2B2[7:0]

CCF1B1[7:0]

CCF1B2[7:0]

ESTATUS[1:0] Serial read-back status bit selection. (See Tabl e 2 -2.)

2-6 Conexant 100123B

0 = Normal operation
1 = Disables DACA output. Current is set to 0; output will go to 0 V.

This is the first byte of closed-caption information for the even field, line 284 for NTSC or line 335
for PAL. Data is encoded LSB first.

This is the second byte of closed-caption information for the even field, line 284 for NTSC or line
335 for PAL. Data is encoded LSB first.

This is the first byte of closed-caption information for the odd field, line 21 for NTSC or line 22 for
PAL. Data is encoded LSB first.

This is the second byte of closed-caption information for the odd field, line 21 for NTSC or line 22
for PAL. Data is encoded LSB first.

Bt868/Bt869 2.0 Internal Registers

Flicker-Free Video Encoder with Ultrascale

Table 2-4. Programming Detail (4 of 7)

Bit/Register Names Bit/Register Definition

TM

Technology 2.3 Reading Information

ECCF2

ECCF1

ECCGATE

ECBAR

DCHROMA

EN_OUT

EN_BLANKO Enables BLANK* pin as an output.

EN_DOT Enables dot clock synchronization on BLANK* pin.

FIELDI

VSYNCI

HSYNCI

0 = Disables closed-caption encoding on field 2.
1 = Enables closed-caption encoding on field 2.

0 = Disables closed-caption encoding on field 1.
1 = Enables closed-caption encoding on field 1.

0 = Normal closed-caption encoding.
1 = Enables closed-caption encoding constraints. After encoding, future encoding is disabled until

a complete pair of new data bytes is received. This prevents encoding of redundant or
incomplete data.

0 = Normal operation
1 = Enables color bars.

0 = Normal operation
1 = Blank chroma

0 = Three-states all outputs.
1 = Allows outputs to be enabled (depending upon EN_BLANKO register bit and SLAVE pin).

0 = Logical 1 on FIELD indicates an even field.
1 = Logical 1 on FIELD indicates an odd field.

0 = Active low VSYNC*
1 = Active high VSYNC*

0 = Active low HSYNC*
1 = Active high HSYNC*

IN_MODE[2:0] Format of pixels at input of encoder:

000 = 24-bit RGB multiplexed
001 = 16-bit RGB multiplexed
010 = 15-bit RGB multiplexed
011 = 24-bit RGB non-multiplexed
100 = 24-bit YCrCb multiplexed
101 = 16-bit YCrCb multiplexed
110 = Reserved
111 = 24-bit YCrCb non-multiplexed

DIS_YFLPF Luma Initial Horizontal Low Pass Filter

0 = Enable
1 = Disable

DIS_FFILT

F_SELC[2:0] Chroma FlickerFilter:

0 = Enables FlickerFilter
1 = Disables FlickerFilter

000 = 5 Line
001 = 2 Line
010 = 3 Line
011 = 4 Line
100 = Alternate 5 Line
101 = Alternate 5 Line
110 = Alternate 5 Line
111 = Alternate 5 Line

100123B Conexant 2-7

2.0 Internal Registers Bt868/Bt869

2.3 Reading Information Flicker-Free Video Encoder with Ultrascale

Table 2-4. Programming Detail (5 of 7)

Bit/Register Names Bit/Register Definition

F_SELY[2:0] Luma FlickerFilter:

000 = 5 Line
001 = 2 Line
010 = 3 Line
011 = 4 Line
100 = Alternate 5 Line
101 = Alternate 5 Line
110 = Alternate 5 Line
111 = Alternate 5 Line

TM

Technology

DIS_GMUSHY

DIS_GMSHY

YCORING[2:0] Luma Coring:

YATTENUATE[2:0] Luma Attenuation

DIS_GMUSHC

0 = Enables Luma Anti-Psuedo Gamma Removal.
1 = Disables Luma Anti-Psuedo Gamma Removal.

0 = Enables Luma Psuedo Gamma Removal.
1 = Disables Luma Psuedo Gamma Removal.

000 = Bypass
001 = 1/128 of range
010 = 1/64 of range
011 = 1/32 of range
100 = 1/16 of range
101 = 1/8 of range
110 = 1/4 of range
111 = Reserved

000 = 1.0 gain (no attenuation)
001 = 15/16 gain
010 = 7/8 gain
011 = 3/4 gain
100 = 1/2 gain
101 = 1/4 gain
110 = 1/8 gain
111 = 0 gain (Force Luma to 0)

0 = Enables Chroma Anti-Psuedo Gamma Removal.

1 =Disables Chroma Anti-Psuedo Gamma Removal.

DIS_GMSHC

CCORING[2:0] Chroma Coring:

000 = Bypass

2-8 Conexant 100123B

0 = Enables Chroma Psuedo Gamma Removal.
1 = Disables Chroma Psuedo Gamma Removal.

001 = 1/128 of range (+/- 1/256 of range)
010 = 1/64 of range (+/- 1/128 of range)
011 = 1/32 of range (+/- 1/64 of range)
100 = 1/16 of range (+/- 1/32 of range)
101 = 1/8 of range (+/- 1/16 of range)
110 = 1/4 of range (+/- 1/8 of range)
111 = Reserved

Bt868/Bt869 2.0 Internal Registers

Flicker-Free Video Encoder with Ultrascale

Table 2-4. Programming Detail (6 of 7)

Bit/Register Names Bit/Register Definition

CATTENUATE[2:0] Chroma Attenuation:

000 = 1.0 gain (No Attenuation)
001 = 15/16 gain
010 = 7/8 gain
011 = 3/4 gain
100 = 1/2 gain
101 = 1/4 gain
110 = 1/8 gain
111 = 0 gain (Force Chroma to 0)

00 = Output Video[0] on DACA

OUT_MUXA[1:0]

OUT_MUXB[1:0]

OUT_MUXC[1:0]

01 = Output Video[1] on DACA
10 = Output Video[2] on DACA
11 = Output Video[3] on DACA

00 = Output Video[0] on DACB
01 = Output Video[1] on DACB
10 = Output Video[2] on DACB
11 = Output Video[3] on DACB

00 = Output Video[0] on DACC
01 = Output Video[1] on DACC
10 = Output Video[2] on DACC
11 = Output Video[3] on DACC

TM

Technology 2.3 Reading Information

CCR_START[8:0] Closed-captioning clock run-in start in clock cycles from leading edge of HSYNC*

CC_ADD[11:0] Closed-captioning DTO increment

DIV2 Divides input pixel rate by two (for CCIR601 interlaced timing input.

MODE2X Divides selected input clock by two (allows for 2x rather than double-edge clock input).

EN_ASYNC Set to 0 for normal operation.

00 = Video[0-3] is CVBS/ Y/ C/ Y_DLY

OUT_MODE[1:0]

LUMADLY[1:0]

HSYNOFFSET[9:0]

01 = Video[0-3] is CVBS_DLY/ Y/ C/ Y_DLY
10 = Video[0-3] is V/ Y/ U/ Y_DLY
11 = Video[0-3] is R/ G/ B/ X (VGA mode)

This 2-bit value can be used to program the luminance delay in pixels for the CVBS_DLY and
Y_DLY output modes.

00 = No delay
01 = 1 pixel
10 = 2 pixels
11 = 3 pixels

A 2s-complement number. The values range from –512 pixels to +511 pixels. This register manip­ulates the falling edge position of the digital HSYNC output from Bt868. The default value is 0 and
denotes the standard position of the HSYNC leading edge.

100123B Conexant 2-9

2.0 Internal Registers Bt868/Bt869

2.3 Reading Information Flicker-Free Video Encoder with Ultrascale

Table 2-4. Programming Detail (7 of 7)

Bit/Register Names Bit/Register Definition

A 2s-complement number. The values range from –HCLKI pixels to +HCLKI pixels. This register

VSYNOFFSET[10:0]

HSYNWIDTH[5:0]

VSYNWIDTH[2:0]

DATDLY

causes the falling edge position of the Bt868’s digital VSYNC output to occur earlier (– value) or
later (+) in time compared to the standard position for NTSC or PAL. The default value is 0 and
denotes the standard position of the VSYNC leading edge.

Controls the duration/width of the digital HSYNC output pulse. Value will be hexadecimal and its
units are in terms of pixels. A value of 0 is a disallowed condition. The acceptable range is 2 pixels
to 3F pixels (=63 decimal). The default value is 2.

Controls the width of the VSYNC output pulse. Denotes the number of lines the VSYNC digital sig­nal remains low on field transitions. Value will be hexadecimal value and its units are in terms of
lines. A value of 0 is a disallowed condition. The acceptable range is 1 line to (2
default value is 1.

Delays the falling edge pixel data by 1 full clock period when the falling edge data precedes the ris­ing edge data. Ensures that the Bt868 moves the falling edge data after the rising edge data. The
correct sequence of rising edge data/falling edge data/rising edge data will then be encoded by
Buteo. The default value for this bit is 0 because most graphics controllers already transmit data in
the expected rising edge data/falling edge data sequence.

TM

Technology

3

–1) lines. The

Swaps the falling edge pixel data with the rising edge pixel data at the input of the pixel port. The

DATSWP

NOTE(S): VSYNWIDTH, HSYNWIDTH, VSYNOFFSET, and HSYNOFFSET are active only when the Bt868/869 is in the master

timing mode when the encoder outputs HSYNC and VSYNC pulses. In the slave timing mode, these registers are ignored.
VSYNCWIDTH and HSYNCWIDTH should never be set to 0.

default value for this bit is 0 which tells the VGA Encoder to expect an order of rising edge data/fall­ing edge data coming from the graphics controller.

2-10 Conexant 100123B

3

3.0 PC Board Considerations

For optimum performance of the Bt868/869, proper CMOS layout techniques
should be studied in the Bt451/457/458 Evaluation Module Operation and
Measurements Application Note (AN-16), before PC board layout is begun.

The layout should be optimized for lowest noise on the power and ground
planes by providing good decoupling. The trace length between groups of VAA
and GND pins should be as short as possible to minimize inductive ringing.

A well-designed power distribution network is critical to eliminating digital
switching noise. The ground plane must provide a low-impedance return path for
the digital circuits. A PC board with a minimum of four layers is recommended,
with layers 1 (top) and 4 (bottom) for signals, and layers 2 and 3 for ground and
power, respectively.

3.1 Component Placement

Components should be placed as close as possible to the associated pin in order
for traces to be connected point to point. The optimum layout enables the
Bt868/869 to be located close to the power supply connector and the video output
connector. For an illustration, see Figure 3-1.

3.2 Power and Ground Planes

For optimum performance, a common digital and analog ground plane and a
common digital and analog power plane are recommended. The power plane
should provide power to all Bt868/869 power pins, reference voltage (Vref)
circuitry, and COMP decoupling.

The Bt868/869 power plane should be connected to the graphics system power
plane (VCC) at a single point through a ferrite bead, as illustrated in Figures 3-1
and 3-2. This bead should be located within 3 inches of the Bt868/869. The bead
provides resistance to switching currents, acting as a resistor at high frequencies.
A low-resistance bead should be used, such as Ferroxcube 5659065-3B, Fair-Rite
2723021447, or TDK BF45-4001. See Tabl e 3- 1 for a typical parts list for key
passive components and Figure 3-3 for a schematic diagram of the recommended
layout.

100123B Conexant 3-1

3.0 PC Board Considerations Bt868/Bt869

3.2 Power and Ground Planes Flicker-Free Video Encoder with Ultrascale

Figure 3-1. Power Plane Illustration

Bracket

3V

Bt868

Ferrite Bead

TM

Technology

Analog

Bt decoder

5V

3VAA-Bt868 o

Oscillator

Clocks

PCI or AGP Connector

o VCC3

o VCC3

Data

3 V

4 layer board

plane order:

TOP

BOTTOM

Signals

GND

PWR

Signals

3-2 Conexant 100123B

Bt868/Bt869 3.0 PC Board Considerations

Flicker-Free Video Encoder with Ultrascale

Figure 3-2. Connection Diagram for Output Filters and Other Key Passive Components

TM

Technology 3.2 Power and Ground Planes

Bt868/869

FSADJUST

1.8 µH

270 pF

VAA

COMP
VBIAS

VREF

GND

DACA

DACB

DACC

LPF

22 pF

C7

C8

DAC Output

330 pF

C9

RSET =

100 Ω,1%

VAA

P

GND

Bt868/869 Power Plane

C2–C6

Ω, 75 Ω,

75

1%

Schottky Diodes

To Filter

Schottky Diodes

22 pF

1.8 µH

270 pF

1%

+

75 Ω,

1%

RF Mod/CVBS

P

P

RF Modulator/CVBS Out

75

330 pF

82

C10

LPF

LPF

L1

Buffer

TRAP

C1

RF

Modulator

ZIN = 1 K

Audio

+3.3 V (VCC)

Ground
(Power Supply
Connector)

To V i de o
Connector

CVBS

P

RF

(1)

(1)

Some modulators may require AC coupling capacitors (10 µF).

Table 3-1. Typical Parts List for Key Passive Components

Location Description Vendor Part Number

C1–C9 0.1 µF Ceramic Capacitor Erie RPE112Z5U104M50V

C10 47 µF Capacitor Mallory CSR13F476KM

L1 Ferrite Bead–Surface Mount Fair-Rite 2743021447

RSET 1% Metal Film Resistor Dale CMF-55C

TRAP Ceramic Resonator Murata TPSx.xMJ or MB2 (where x.x = sound carrier frequency in MHz)

Schottky Diodes BAT85 (BAT54F Dual) HP 5082-2305 (1N6263) Siemens BAT 64-04 (Dual)

NOTE(S): Vendor numbers are listed only as a guide. Substitution of devices with similar characteristics will not affect

Bt868/869 performance.

100123B Conexant 3-3

3.0 PC Board Considerations Bt868/Bt869

3.2 Power and Ground Planes Flicker-Free Video Encoder with Ultrascale

Figure 3-3. Complete Bt868/Bt869 Recommended Layout

TM

Technology

3-4 Conexant 100123B

Bt868/Bt869 3.0 PC Board Considerations

Flicker-Free Video Encoder with Ultrascale

TM

Technology 3.3 Decoupling

3.3 Decoupling

3.3.1 Device Decoupling

For optimum performance, all capacitors should be located as close as possible to
the device, and the shortest possible leads (consistent with reliable operation)
should be used to reduce the lead inductance. Chip capacitors are recommended
for minimum lead inductance. Radial lead ceramic capacitors can be substituted
for chip capacitors and are better than axial lead capacitors for self-resonance.
Values are chosen to have self-resonance above the pixel clock.

3.3.2 Power Supply Decoupling

The best power supply performance is obtained with a 0.1 µF ceramic capacitor
decoupling each group of VAA pins and each group of VDD pins to GND. The
capacitors should be placed as close as possible to the device VAA/VDD pins and
GND pins and connected with short, wide traces.

The 47
ripple; the 0.1

When a linear regulator is used, the proper power-up sequence must be
verified to prevent latchup. A linear regulator is recommended to filter the analog
power supply if the power supply noise is greater than or equal to 200 mV. This is
especially important when a switching power supply is used, and the switching
frequency is close to the raster scan frequency. About 5% of the power supply
hum and ripple noise less than 1 MHz will couple onto the analog outputs.

µF capacitor shown in Figure 3-2 is for low-frequency power supply

µF capacitors are for high-frequency power supply noise rejection.

3.3.3 COMP Decoupling

The COMP pin must be decoupled to the closest VAA pin, typically with a 0.1 µF
ceramic capacitor. Low-frequency supply noise will require a larger value. The
COMP capacitor must be as close as possible to the COMP and VAA pins. A
surface-mount ceramic chip capacitor is preferred for minimal lead inductance.
Lead inductance degrades the noise rejection of the circuit. Short, wide traces will
also reduce lead inductance.

3.3.4 VREF Decoupling

A 0.1 µF ceramic capacitor should be used to decouple this input to GND.

3.3.5 VBIAS Decoupling

A 0.1 µf ceramic capacitor should be used to decouple this output to GND.

100123B Conexant 3-5

3.0 PC Board Considerations Bt868/Bt869

3.4 Signal Interconnect Flicker-Free Video Encoder with Ultrascale

TM

Technology

3.4 Signal Interconnect

3.4.1 Digital Signal Interconnect

The digital inputs to the Bt868/869 should be isolated as much as possible from
the analog outputs and other analog circuitry. Also, these input signals should not
overlay the analog power plane or analog output signals.

Most of the noise on the analog outputs will be caused by excessive edge rates
(less than 3 ns), overshoot, undershoot, and ringing on the digital inputs.

The digital edge rates should not be faster than necessary, as feedthrough
noise is proportional to the digital edge rates. Lower-speed applications will
benefit from using lower-speed logic (3–5 ns edge rates) to reduce data-related
noise on the analog outputs.

Transmission lines will mismatch if the lines do not match the source and
destination impedance. This will degrade signal fidelity if the line length
reflection time is greater than one-fourth the signal edge time (refer to
Application Notes AN-11 and AN-12). Line termination or line-length reduction
is the solution. For example, logic edge rates of 2 ns require line lengths of less
than 4 inches without use of termination. Ringing can be reduced by damping the
line with a series resistor (30–300

Radiation of digital signals can also be picked up by the analog circuitry. This
is prevented by reducing the digital edge rates (rise/fall time), minimizing ringing
with damping resistors, and minimizing coupling through PC board capacitance
by routing the digital signals at a 90-degree angle to any analog signals.

The clock driver and all other digital devices must be adequately decoupled to
prevent noise generated by the digital devices from coupling into the analog
circuitry.

Ω).

3.4.2 Analog Signal Interconnect

The Bt868/869 should be located as close as possible to the output connectors to
minimize noise pickup and reflections caused by impedance mismatch.

The analog outputs are susceptible to crosstalk from digital lines; digital traces
must not be routed under or adjacent to the analog output traces.

To maximize the high-frequency power supply rejection, the video output
signals should overlay the ground plane.

For maximum performance, the analog video output impedance, cable
impedance, and load impedance should be the same. The load resistor connection
between the video outputs and GND should be as close as possible to the
Bt868/869 to minimize reflections. Unused analog outputs should be connected
to GND.

3-6 Conexant 100123B

Bt868/Bt869 3.0 PC Board Considerations

Flicker-Free Video Encoder with Ultrascale

TM

Technology 3.5 Applications Information

3.5 Applications Information

3.5.1 Electrostatic Discharge and Latchup Considerations

Correct electrostatic discharge (ESD)-sensitive handling procedures are required
to prevent device damage. Device damage can produce symptoms of catastrophic
failure or erratic device behavior with leaky inputs.

All logic inputs should be held low until power to the device has settled to the
specified tolerance. DAC power decoupling networks with large time constants
should be avoided; they could delay VAA and VDD power to the device. Ferrite
beads must be used only for analog power VAA decoupling. Inductors cause a
time-constant delay that induces latchup, and should not be substituted for a
ferrite bead.

Latchup can be prevented by ensuring that all VAA and all GND pins are at
the same potential and that the VAA and VDD supply voltage is applied before
the signal pin voltages. The correct power-up sequence ensures that any signal pin
voltage will never exceed the power supply voltage.

3.5.2 Clock and Subcarrier Stability

The color subcarrier is derived directly from the CLKO (derived from
XTALIN/XTALOUT) CLKI when EN_XCLK=1 input, hence any jitter or
frequency deviation of CLKO (XTALIN/XTALOUT) or CLKI when
EN_XCLK=1 will be transferred directly to the color subcarrier. Jitter within the
valid CLKO cycle interval will result in hue noise on the color subcarrier on the
order of 0.9–1.6 degrees per nanosecond. Random hue noise can result in
degradation in AM/PM noise ratio (typically around 40 dB for consumer media
such as Videodiscs and VCRs). Periodic or coherent hue noise can result in
differential phase error (which is limited to 10 degrees by FCC cable TV
standards).

Any frequency deviation of CLKO from nominal will challenge the subcarrier
tracking capability of the destination receiver. This may range from a few
parts-per-million (ppm) for broadcast equipment to 100 ppm for industrial
equipment, to a few hundred ppm for consumer equipment. Greater subcarrier
tracking range generally results in poorer subcarrier decoding dynamic range, so
that receivers that tolerate jitter and wide subcarrier frequency deviation will
introduce more noise in the decoded image. Crystal-based clock sources with a
maximum total deviation of 50 ppm (NTSC) or 25 ppm (PAL) across the
temperature range of 0
industrial applications. In rare cases, temperature-compensated clock sources
with tighter tolerances may be warranted for broadcast or more stringent PAL
(e.g., type I) applications.

Some applications call for maintaining correct Subcarrier-Horizontal (SC-H)
phasing for correct color framing. This requires subcarrier coherence within
specified tolerances over a four-field interval for 525-line systems or 8 fields for
625-line systems. Any clock interruption (even during vertical blanking interval)
which results in mis-registration of the CLKI input or nonstandard pixel counts
per line, can result in SC-H excursions outside the NTSC limit of ±40 degrees

°C to 70°C produce the best results for consumer and

100123B Conexant 3-7

3.0 PC Board Considerations Bt868/Bt869

3.5 Applications Information Flicker-Free Video Encoder with Ultrascale

(reference EIA RS170A) or the PAL limit of ±20 degrees (reference EBU
D23-1984).

In slave mode, any deviation exceeding the 50 ppm (NTSC) or 25 ppm (PAL)
limits of the number CLKO cycles between HSYNC* falling edges when in slave
mode may result in a switch to Master Mode.

TM

Technology

3.5.3 Filtering Radio Frequency Modulator Connection

The Bt868/869’s internal upsampling filter alleviates external filtering
requirements by moving significant sampling alias components above 19 MHz
and reducing the sinx/x aperture loss up to the filters passband cutoff of 5.75
MHz. While typical chrominance subcarrier decoders can handle the Bt868/869
output signals without analog filtering, the higher frequency alias products pose
some EMI concerns and may create troublesome images when introduced to a
radio frequency (RF) modulator. When the video is presented to an RF modulator,
it should be free of energy in the region of the aural subcarrier (4.5 MHz for
NTSC, 5.5–6.5 MHz for PAL). Hence some additional frequency traps may be
necessary when the video signal contains fundamental or harmonic energy (as
from unfiltered character generators) in that region. Where better frequency
response flatness is required, some peaking in the analog filter is appropriate to
compensate for residual digital filter losses with sufficient margin to tolerate 10%
reactive components.

A three-pole elliptic filter (one inductor, three capacitors) with a 6.75 MHz
passband can provide at least 45 dB attenuation (including sinx/x loss) of
frequency components above 20 MHz and provide some flexibility for mild
peaking or special traps. An inductor value with a self-resonant frequency above
80 MHz is chosen so that its intrinsic capacitance contributes less than 10% of the
total effective circuit value. The inductor itself may induce 1% (0.1 dB) loss. Any
additional ferrites introduced for EMI control should have less than 5
impedance below 5 MHz to minimize additional losses. The capacitor to ground
at the Bt868/869 output pin is compensating for the parasitic capacitance of the
chip plus any protection diodes and lumped circuit traces (about 22 pF +
5 pF/diode). Some filter peaking can be accomplished by splitting the 75
source impedance across the reactive PI filter network. However, this will also
introduce some chrominance-luminance delay distortion in the range of 10–20 ns
for a maximum of 0.5 dB boost at the subcarrier frequency.

The filter network feeding an RF modulator may include the aforementioned
trap, which could take two forms depending on the depth of attenuation and type
of resonator device employed.

The trap circuitry can interact with the lowpass filter, compromising
frequency response flatness. A simple PNP buffer can preserve the benefits of an
oversampling encoder when simultaneous Composite Video Baseband Signals
(CVBS) are required for driving external cables. In addition, an active video
buffer, serves to isolate the RF modulator signal amplitude from anomalies in the
external termination. This buffer can be implemented with a transistor array or
video amplify IC which provides a gain of two (before series termination),
capable of driving 740 µA into the 75
input/output compliance range. When simultaneous Y/C (s-video) outputs are not
required, a second CVBS signal can be created (with a 600 mV sync to tip offset)
by tying these pins together with a single termination resistor (typically 75
driving the lowpass filter circuit.

Ω

Ω

Ω destination, and is biased within its

Ω) and

3-8 Conexant 100123B

Bt868/Bt869 3.0 PC Board Considerations

Flicker-Free Video Encoder with Ultrascale

The RF modulator typically has a high input impedance (about 1k Ω ±30%)
and loose tolerance. Consequently, the amplitude variation at the modulator input
will be greater, especially when the trap is properly terminated at the modulator
input for maximum effect. Some modulators, video or aural fidelity, degrade
dramatically when overdriven, so the value of the effective termination
(nominally 37.5
linearity (or depth of modulation margin) in the RF signal.

A two-section trap (with associated inductor) may be warranted to achieve
better than 20 dB attenuation when stereo, SAP, or AM aural carriers are
generated, or when > 40 dB audio dynamic range is desired. Some impedance
isolation (e.g., buffer) may be required before the trap to obtain the flattest
frequency response. See Figure 3-2.

TM

Technology 3.6 Bt868/Bt869 Evaluation Board

Ω) may need to be adjusted downward to maintain sufficient

3.6 Bt868/Bt869 Evaluation Board

See Figure 3-4 for a schematic diagram of the Bt868 EVK evaluation card. This is
a reference design intended to facilitate implementation of Conexant’s VGA
Encoder into a graphics card. The Bt868EVK may be obtained through your local
Conexant Semiconductor sales office.

100123B Conexant 3-9

3.0 PC Board Considerations Bt868/Bt869

3.6 Bt868/Bt869 Evaluation Board Flicker-Free Video Encoder with Ultrascale

Figure 3-4. Bt868/Bt869 Evaluation Board (1 of 6)

TM

Technology

3-10 Conexant 100123B

Bt868/Bt869 3.0 PC Board Considerations

Flicker-Free Video Encoder with Ultrascale

Figure 3-4. Bt868/Bt869 Evaluation Board (2 of 6)

TM

Technology 3.6 Bt868/Bt869 Evaluation Board

100123B Conexant 3-11

3.0 PC Board Considerations Bt868/Bt869

3.6 Bt868/Bt869 Evaluation Board Flicker-Free Video Encoder with Ultrascale

Figure 3-4. Bt868/Bt869 Evaluation Board (3 of 6)

TM

Technology

3-12 Conexant 100123B

Bt868/Bt869 3.0 PC Board Considerations

Flicker-Free Video Encoder with Ultrascale

Figure 3-4. Bt868/Bt869 Evaluation Board (4 of 6)

TM

Technology 3.6 Bt868/Bt869 Evaluation Board

100123B Conexant 3-13

3.0 PC Board Considerations Bt868/Bt869

3.6 Bt868/Bt869 Evaluation Board Flicker-Free Video Encoder with Ultrascale

Figure 3-4. Bt868/Bt869 Evaluation Board (5 of 6)

TM

Technology

3-14 Conexant 100123B

Bt868/Bt869 3.0 PC Board Considerations

Flicker-Free Video Encoder with Ultrascale

Figure 3-4. Bt868/Bt869 Evaluation Board (6 of 6)

TM

Technology 3.6 Bt868/Bt869 Evaluation Board

100123B Conexant 3-15

3.0 PC Board Considerations Bt868/Bt869

3.7 Serial Interface Flicker-Free Video Encoder with Ultrascale

TM

Technology

3.7 Serial Interface

3.7.1 Data Transfer on the Serial Interface Bus

Figure 3-5 illustrates the relationship between SID (Serial Interface Data) and

SIC (Serial Interface Clock) to be used when programming the internal registers
via the Serial Interface bus. If the bus is not being used, both SID and SIC lines
must be left high.

Every byte put onto the SID line should be 8 bits long (MSB first), followed
by an acknowledge bit, which is generated by the receiving device. Each data
transfer is initiated with a start condition and ended with a stop condition. The
first byte after a start condition is always the slave address byte. If this is the
device’s own address, the device will generate an acknowledge by pulling the SID
line low during the ninth clock pulse, then accept the data in subsequent bytes
(auto-incrementing the subaddress) until another stop condition is detected.

The eighth bit of the address byte is the read/write bit (high = read from
addressed device; low = write to the addressed device) so, for the Bt868/869, the
subaddress is only considered valid if the R/W bit is low. Data bytes are always
acknowledged during the ninth clock pulse by the addressed device. Note that
during the acknowledge period, the transmitting device must leave the SID line
high.

Premature termination of the data transfer is allowed by generating a stop
condition at any time. When this happens, the Bt868/869 will remain in the state
defined by the last complete data byte transmitted and any master acknowledge
subsequent to reading the chip ID (subaddress 0x89) is ignored.

Figure 3-5. SID/SIC Diagram

SIC

1

23456789

SID

MSB

Start Condition

(1)

Acknowledge generated by Bt868/869.

Main Address

Slave

(XX)

123456789

LSB

(1)

Subaddress

(XX)

Subsequent Bytes and Acknowledge
Interpreted as Data Values for
Auto-Incrementing Subaddress Locations

1234 56 789

(1) (1)

Data

(XX)

Stop Condition

3-16 Conexant 100123B

4.0 Parametric Information

4.1 DC Electrical Parameters

DC electrical parameters are defined in Tabl es 4 -1 through 4-3. AC electrical
parameters are defined in

Table 4 -4. Timing diagrams are in Figures 4-1 through 4-3.

Table 4-1. Recommended Operating Conditions

Parameter Symbol Min Typ Max Units

4

Power Supply VAA, VDD 3.00 3.30 3.60 V

Serial Input Supply VDD_SI 3.00 5.25 V

Ambient Operating Temperature TA 0 70 °C

DAC Output Load RL 37.5 W

Nominal RSET RSET 100.0 W

Table 4-2. Absolute Maximum Rating (1 of 2)

Parameter Symbol Min Typ Max Units

VAA, VDD (measured to GND) 7.0 V

VDD_SI (measured to GND) 7.0 V

100123B Conexant 4-1

4.0 Parametric Information Bt868/Bt869

4.1 DC Electrical Parameters Flicker-Free Video Encoder with Ultrascale

Table 4-2. Absolute Maximum Rating (2 of 2)

Parameter Symbol Min Typ Max Units

Voltage on Any Signal Pin

(1) GND – 0.5 VDD_SI+ 0.5 V

TM

Technology

Analog Output Short Circuit Duration to Any Power
Supply or Common

Storage Temperature TS – 65 +150 °C

Junction Temperature TJ +125 °C

Vapor Phase Soldering (1 Minute) TVSOL 220 °C

(1)

This device employs high-impedance CMOS devices on all signal pins. It should be handled as an ESD-sensitive device.
Voltage on any signal pin that exceeds the power supply or ground voltage by more than 0.5 V can cause destructive latchup.

Stresses above those listed under “Absolute Maximum Ratings” can cause permanent damage to the device. This
is a stress rating only, and functional operation of the device at these or any other conditions above those listed in
the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods can affect device reliability.

Table 4-3. DC Characteristics (1 of 2)

Parameter Symbol Min Typ Max Units

Video D/A Resolution 10 10 10 Bits

Output Current-DAC Code 1023 (Iout Full Scale) 34.13 mA

Output Voltage-DAC Code 1023 1.28 V

Video Level Error (Nominal Resistors) 5 %

Output Capacitance (of DAC output) 22 pF

ISC Indefinite

Digital Inputs (Except those specified below)

Input High Voltage VIH 2.0

Input Low Voltage VIL GND – 0.5 0.8 V

Input High Current (Vin = 2.4 V) IIH 1 µA

Input Low Current (Vin = 0.4 V) IIL – 1µA

Input Capacitance (f =1 MHz, Vin = 2.4 V) CIN 7 pF

SID, SDO

Input High Voltage VIH 0.7

Input Low Voltage VIL GND – 0.5 0.3 * VDD_SI V

CLKI Input

Input High Voltage VIH 2.4

Input Low Voltage VIL GND – 0.5 0.8 V

VDD_SI

*

VDD_I

VDD_SI

VDD_I

+ 0.5

+ 0.5

+ 0.5

V

V

V

4-2 Conexant 100123B

Bt868/Bt869 4.0 Parametric Information

Flicker-Free Video Encoder with Ultrascale

Table 4-3. DC Characteristics (2 of 2)

Parameter Symbol Min Typ Max Units

Digital Outputs

Output High Voltage (IOH = –400 µA) VOH 2.4 VDD V

Output Low Voltage (IOL = 3.2 mA) VOL GND 0.4 V

Three-State Current IOZ 50 µA

Output Capacitance CDOUT 10 pF

NOTE(S): Recommended Operating Conditions, NTSC CCIR 601 operation, and internal clock frequency = 27 MHz. As the above

parameters are guaranteed over the full temperature range (0°C to 70°C), temperature coefficients are not specified or required.
Typical values are based on nominal temperature, i.e., room temperature, and nominal voltage, i.e., 3.3 V.

TM

Technology 4.1 DC Electrical Parameters

100123B Conexant 4-3

4.0 Parametric Information Bt868/Bt869

4.2 AC Electrical Parameters Flicker-Free Video Encoder with Ultrascale

TM

Technology

4.2 AC Electrical Parameters

Table 4-4. AC Characteristics (1 of 2)

Parameter

Hue Accurac(1, 2)

Color Saturation Accuracy

Chroma AM/PM Noise

Differential Gain

Differential Phase(2)

SNR (Unweighted 100 IRE Y Ramp
Tilt Correct)

RMS 6.3.1 dB rms

Peak Per iodic 6.3.2 dB p–p

100 IRE Multiburst

(2) 6.2.2.1 C3.4.1.3 % p–p

(2)

(1, 2)

(3)

(3)

EIA/TIA

250C Ref

1 MHz

Red Field

6.2.2.2 C3.4.1.4

6.1.1

CCIR 567 Symbol Min Typ Max Units

Gain/frequency C3.5.4.1

Chroma/Luma Gain Ineq

Chroma/Luma Delay Ineq

Short Time Distortion
100 IRE/PIXEL(3)

(3)

(3) 6.1.2 C3.5.3.2 ns

6.1.2.2 C3.5.3.1

6.1.6 %

± ×

± %

dB rms

× p–p

± IRE

± IRE

Luminance Nonlinearity(2) 6.2.1 %

Chroma/Luma Intermod(2)

Chroma Nonlinear Gain

Chroma Nonlinear Phase

Pixel/Control Setup Time

Pixel/Control Hold Time(2) 2 .35 ns

Control Output Delay Time(4) 315ns

Control Output Hold Time(4) 42 ns

CLKI/O Frequency 40.5 MHz

CLKI/O Pulse Width Low Duty
Cycle

CLKI/O Pulse Width High Duty
Cycle

4-4 Conexant 100123B

(2)

(2)

(2) 13 12 ns

6.2.3

6.2.4.1

6.2.4.2

± IRE

± IRE

± ×

40 50 60 %

40 50 60 %

Bt868/Bt869 4.0 Parametric Information

Flicker-Free Video Encoder with Ultrascale

Table 4-4. AC Characteristics (2 of 2)

TM

Technology 4.2 AC Electrical Parameters

Parameter

CLKO to CLKI Delay 7 0.8 CLKO cycles

SLAVE to HSYNC*/VSYNC*
Three-state

SLAVE to HSYNC*/VSYNC* Active 6 2 CLKI cycles

VAA Supply Current 132 mA

VAA Power-Down Current 1 mA

VDD Supply Current 118 mA

VDD Power-Down Current 1 mA

Total Supply Current 250 mA

(1)

5/7.5/75/7.5 Color bars normalized to burst.

(2)

Guaranteed by characterization.

(3)

Without post filter. Guaranteed by design.

(4)

Control pins are defined as: P[11:0], BLANK*, HSYNC*, VSYNC*, FIELD, CLKDIR, RESET*, PAL, and SLAVE.

5. “Recommended Operating Conditions,” NTSC CCIR 601 operation, and CLK frequency = 27 MHz. Analog output load <
pF. HSYNC*, VSYNC*, BLANK*, and FIELD output load <
temperature range, temperature coefficients are not specified or required. Typical values are based on nominal temperature,
i.e., room temperature, and nominal voltage, i.e., 3.3 V. Video input and output timing is shown in Figure 4-1.

EIA/TIA

250C Ref

CCIR 567 Symbol Min Typ Max Units

5 2 CLKI cycles

75

75 pF. As the above parameters are guaranteed over the full

100123B Conexant 4-5

4.0 Parametric Information Bt868/Bt869

4.2 AC Electrical Parameters Flicker-Free Video Encoder with Ultrascale

Figure 4-1. Interface Timing

CLKO

7

CLKI

P[11:0]

1

2

HSYNC*,VSYNC*,

BLANK* (Input)

1

CLKO/CLKI

(Internal/External

Clock Source)

2

1

2

TM

Technology

HSYNC*,VSYNC*

BLANK* (Output)

SLAVE

HSYNC*,VSYNC*

2.4
.8

4

3

6

5

4-6 Conexant 100123B

Bt868/Bt869 4.0 Parametric Information

Flicker-Free Video Encoder with Ultrascale

Figure 4-2. Master Mode with Flicker Filter Interface Timing

CLKI

P[11:0]

(Mux Mode)

P[23:0]

(Non-

Mux Mode)

BLANK*

(Input)

CLKO

HSYNC*

(Output)

TM

Technology 4.2 AC Electrical Parameters

POL

POH

H_BLANKI - 3

P1L P1H P2L

P0 P1 P2 Pn

P2H

PnH

Internal
Sample

Counter

VSYNC*

(Output)

Internal

Counter

BLANK*
(Output)

Line

Sample1 Sample2Sample2Sample1

Line 1 Line V_BLANK1+1

Sample
H_Blank

Sample
H_Blank

Sample
H_Blank

Sample
H_Blank

100123B Conexant 4-7

4.0 Parametric Information Bt868/Bt869

4.2 AC Electrical Parameters Flicker-Free Video Encoder with Ultrascale

Figure 4-3. Slave Mode with Flicker Filter Interface Timing

CLKO

CLKI

POL

POH

P1L

P1H

P2L PnL

H_BLANK

P0 P1 P2 Pn

BLANK*

(Input)

HSYNC*

(Input)

PnH

TM

Technology

Internal
Sample

Counter

VSYNC*

(Input)

BLANK*

(Output)

Sample

HCLKI

Sample1

Sample

H_BLANKI

-2

Sample

H_BLANKI

-1

Sample

H_BLANKI

Sample
H_Blank

4-8 Conexant 100123B

Bt868/Bt869 4.0 Parametric Information

Flicker-Free Video Encoder with Ultrascale

TM

Technology 4.3 Mechanical Drawing

4.3 Mechanical Drawing

A detailed mechanical diagram is shown in Figure 0-1.

Figure 0-1. 80 MQFP Package Diagram

80 MQFP - 1.6/0.15mm FORM

TOP VIEW

D

D2

BOTTOM VIEW

D1

E

E2

e

SIDE VIEW

DETAIL A

A2

A1

1.60

(.063)

b

A

L

REF.

S
Y

M

B
O
L

MIN. NOM. MAX.

---

A

0.05

A1

A2

16.95

D

D1

D2

16.95

E

E1

E2

L

0.73

L1

e

b

0.25

ALL DIMENSIONS IN

MILLIMETERS

---

---

2.0 REF.

---

14.0 REF.

12.35 REF.

---

14.0 REF.

12.35 REF.

0.80

16 REF.

0.65 BSC

---

2.4

0.35

17.45

17.45

1.03

0.45

E1

100123B Conexant 4-9

4.0 Parametric Information Bt868/Bt869

4.3 Mechanical Drawing Flicker-Free Video Encoder with Ultrascale

TM

Technology

4-10 Conexant 100123B

A

Appendix A. Scaling and I/O Timing Register Calculations

The calculated values are used to program the registers controlling the total active
pixels and lines in the input frame and the output field, as well as the vertical
scaling register and the clock PLL registers. These calculations assume pixel
resolution for synchronizing the graphics controller, and master mode operation
unless otherwise stated, and require the following input values:

MFP—Minimum Front Porch Blanking in the Input in Clocks = max
(12, Controller_Minimum_Front_Porch_Blanking_Clocks);
MBP—Minimum Back Porch Blanking in the Input in Clocks = max
(4, Controller_Minimum_Back_Porch_Blanking_Clocks);

VOC—desired Vertical Overscan Compensation (e.g., 0.15)
HOC—desired Horizontal Overscan Compensation (e.g., 0.15)
V_ACTIVEI—Active Lines per Input Frame (e.g., 480 or 600)
H_ACTIVE—Active Pixels per Input Line (e.g., 640 or 800)
ALO—Target Active Lines per Output Field (See Table A-2)
TLO—Total Lines per Output Field (See Tab le A-2 )
AT O—Active Time per Output Line (See Tabl e A -2)
TTO—Total Time per Output Line (See Tabl e A- 2)

Table A -1 displays details of the video formats. Tabl e A- 2 details the constant

values dependent on encoding modes. Figures A-1 through A-4 diagram overscan
compensation. Tab le s A-3 through A-10 display overscan values.

Table A-1. Video Formats

Mode NTSC

FSC (Hz) 3,579,545 3,579,545 4,433,618.75 4,433,618.75 3,582,056.25 3,575,611.88 3,575,611.88 4,433,619.49

Burst Start 5.3 µs5.3 µs5.60 µs5.60 µs5.60 µs5.80 µs5.80 µs5.60 µs

Burst End 7.82 µs7.82µs7.85 µs7.85 µs8.11 µs8.32 µs8.32 µs7.85 µs

HSYNC
Width

HSYNC
Frequency

Active Begin 9.40 µs9.40 µs 10.5 µs9.40 µs 10.5 µs9.40 µs9.40 µs 10.5 µs

Image
Center

Front Porch 1.50 µs1.50 µs1.50 µs1.50 µs1.50 µs1.50 µs1.50 µs1.50 µs

4.70 µs4.70 µs4.70 µs4.70 µs4.70 µs4.70 µs4.70 µs4.70 µs

63.555 µs64 µs64 µs64 µs64 µs 63.555 µs64 µs64 µs

35.667 µs 35.667 µs 36.407 µs 35.667 µs 36.407 µs 35.667 µs 35.667 µs 36.407 µs

NTSC-

60Hz

PAL-

BDGHI

PAL-N PAL-Nc PAL-M PAL-M60Hz PAL-60

100123B Conexant A-1

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-2. Constant Values Dependent on Encoding Mode

Modes Interlaced Non-Interlaced

PAL NTSC PAL NTSC

ALO 288 243 288 243

TLO 312.5 262.5 312 262

ATO 52.0 µs 52.65556 µs52.0 µs 52.65556 µs

TTO 64.0 µs 63.55556 µs64.0 µs 63.55556 µs

Figure A-1. Overscan Compensation, 640x480 NTSC, 20 Clock Hblank

Overscan Compensation Pecentage Pairs for 640x480 NTSC w/ Character Clock 1 +, 8 *, 9 o

22

20

TM

Technology

18

16

14

12

Horizontal Overscan Compensation Percentage

10

8

8 10 12 14 16 18 20 22

Vertical Overscan Compensation Percentage

A-2 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Figure A-2. Overscan Compensation, 640x480 PAL, 20 Clock Hblank

Overscan Compensation Pecentage Pairs for 640x480 PAL w/ Character Clock 1 +, 8 *, 9 o

24

22

20

18

16

14

TM

Technology

12

Horizontal Overscan Compensation Percentage

10

8

8 10 12 14 16 18 20 22

Vertical Overscan Compensation Percentage

100123B Conexant A-3

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Figure A-3. Overscan Compensation, 800x600 NTSC

Overscan Compensation Percentage Pairs for 800x600 NTSC w/ Character Clock 1 +, 8 *, 9 o

24

3 us

22

20

2 us

18

16

1 us

14

.75 us

TM

Technology

12

0 us Horizontal Blanking

Horizontal Overscan Compensation Percentage

10

8

8 10 12 14 16 18 20 22

Vertical Overscan Compensation Percentage

A-4 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Figure A-4. Overscan Compensation, 800x600 PAL

Overscan Compensation Pecentage Pairs for 800x600 PAL w/ Character Clock 1 +, 8 *, 9 o

22

20

18

16

14

TM

Technology

12

Horizontal Overscan Compensation Percentage

10

8

8 10 12 14 16 18 20 22

Vertical Overscan Compensation Percentage

Table A-3. Overscan Values, 640x480 NTSC, 1 Pixel Resolution, 2.5 Ps Hblank (1 of 3)

Controller Pixels Encoder Pixels

Total Active Total

H_CLKI V_LINESI V_ACTIVEO H_CLKO H V Delta

780 665 190 988 21.81 21.81 0.00

780 595 212 884 12.61 12.76 –0.14

784 600 210 896 13.79 13.58 0.21

780 630 200 936 17.47 17.70 –0.23

Overscan (Percent)

777 575 220 851 9.23 9.47 –0.24

785 630 200 942 18.00 17.70 0.30

777 625 202 925 16.49 16.87 –0.38

777 650 194 962 19.70 20.16 –0.46

775 588 215 868 11.00 11.52 –0.52

775 651 194 961 19.62 20.16 –0.55

100123B Conexant A-5

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-3. Overscan Values, 640x480 NTSC, 1 Pixel Resolution, 2.5 Ps Hblank (2 of 3)

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H_CLKI V_LINESI V_ACTIVEO H_CLKO H V Delta

777 600 210 888 13.01 13.58 –0.57

775 609 207 899 14.07 14.81 –0.74

775 630 200 930 16.94 17.70 –0.76

790 630 200 948 18.51 17.70 0.82

791 600 210 904 14.55 13.58 0.97

770 645 196 946 18.34 19.34 –1.00

770 585 216 858 9.97 11.11 –1.14

770 660 191 968 20.20 21.40 –1.20

770 615 205 902 14.36 15.64 –1.28

TM

Technology

770 630 200 924 16.40 17.70 –1.30

795 630 200 954 19.03 17.70 1.33

770 600 210 880 12.22 13.58 –1.36

795 595 212 901 14.26 12.76 1.51

765 665 190 969 20.28 21.81 –1.53

798 650 194 988 21.81 20.16 1.65

798 600 210 912 15.30 13.58 1.72

798 625 202 950 18.69 16.87 1.81

800 630 200 960 19.53 17.70 1.84

765 630 200 918 15.85 17.70 –1.84

765 595 212 867 10.90 12.76 –1.86

800 609 207 928 16.76 14.81 1.94

798 575 220 874 11.62 9.47 2.15

763 600 210 872 11.41 13.58 –2.17

800 588 215 896 13.79 11.52 2.26

805 630 200 966 20.03 17.70 2.34

760 630 200 912 15.30 17.70 –2.40

805 615 205 943 18.08 15.64 2.44

805 600 210 920 16.03 13.58 2.45

805 645 196 989 21.89 19.34 2.55

756 650 194 936 17.47 20.16 –2.69

A-6 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Table A-3. Overscan Values, 640x480 NTSC, 1 Pixel Resolution, 2.5 Ps Hblank (3 of 3)

Controller Pixels Encoder Pixels

Total Active Total

H_CLKI V_LINESI V_ACTIVEO H_CLKO H V Delta

756 625 202 900 14.17 16.87 –2.70

805 585 216 897 13.88 11.11 2.77

810 630 200 972 20.53 17.70 2.83

755 630 200 906 14.74 17.70 –2.96

805 570 222 874 11.62 8.64 2.97

756 600 210 864 10.59 13.58 –2.99

Table A-4. Overscan Values, 640x480 NTSC, 8 Pixel Resolution, 2.5 Ps Hblank

Controller Pixels Encoder Pixels

Total Active Total

TM

Technology

Overscan (Percent)

Overscan (Percent)

H_CLKI V_LINESI V_ACTIVEO H_CLKO H V Delta

784 600 210 896 13.79 13.58 0.21

800 630 200 960 19.53 17.70 1.84

800 609 207 928 16.76 14.81 1.94

800 588 215 896 13.79 11.52 2.26

760 630 200 912 15.30 17.70 –2.40

840 615 205 984 21.50 15.64 5.86

840 600 210 960 19.53 13.58 5.95

840 610 207 976 20.85 14.81 6.04

840 595 212 952 18.86 12.76 6.10

840 605 209 968 20.20 13.99 6.21

840 590 214 944 18.17 11.93 6.23

840 585 216 936 17.47 11.11 6.36

840 580 218 928 16.76 10.29 6.47

720 665 190 912 15.30 21.81 –6.51

840 575 220 920 16.03 9.47 6.57

840 570 222 912 15.30 8.64 6.66

720 630 200 864 10.59 17.70 –7.10

100123B Conexant A-7

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-5. Overscan Values, 640x480 NTSC, 9 Pixel Resolution, 2.5 Ps Hblank

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H V V H H V Delta

765 665 190 969 20.28 21.81 –1.53

765 630 200 918 15.85 17.70 –1.84

765 595 212 867 10.90 12.76 –1.86

756 650 194 936 17.47 20.16 –2.69

756 625 202 900 14.17 16.87 –2.70

810 630 200 972 20.53 17.70 2.83

756 600 210 864 10.59 13.58 –2.99

810 595 212 918 15.85 12.76 3.09

819 600 210 936 17.47 13.58 3.89

TM

Technology

819 625 202 975 20.77 16.87 3.90

819 575 220 897 13.88 9.47 4.42

720 665 190 912 15.30 21.81 –6.51

720 630 200 864 10.59 17.70 –7.10

855 595 212 969 20.28 12.76 7.52

693 650 194 858 9.97 20.16 –10.20

882 575 220 966 20.03 9.47 10.57

900 574 220 984 21.50 9.47 12.03

675 665 190 855 9.65 21.81 –12.16

Table A-6. Overscan Values, 640x480 PAL, 1 Pixel Resolution, 2.5 Ps Hblank (1 of 4)

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta

945 625 240 945 16.65 16.67 –0.02

946 625 240 946 16.73 16.67 0.07

Overscan (Percent)

944 625 240 944 16.56 16.67 –0.11

947 625 240 947 16.82 16.67 0.16

943 625 240 943 16.47 16.67 –0.20

948 625 240 948 16.91 16.67 0.24

942 625 240 942 16.38 16.67 –0.29

949 625 240 949 17.00 16.67 0.33

A-8 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Table A-6. Overscan Values, 640x480 PAL, 1 Pixel Resolution, 2.5 Ps Hblank (2 of 4)

TM

Technology

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta

941 625 240 941 16.29 16.67 –0.37

950 625 240 950 17.09 16.67 0.42

950 600 250 912 13.63 13.19 0.44

940 625 240 940 16.20 16.67 –0.46

950 650 231 988 20.27 19.79 0.48

950 575 261 874 9.88 9.38 0.50

951 625 240 951 17.17 16.67 0.51

939 625 240 939 16.11 16.67 –0.55

952 625 240 952 17.26 16.67 0.59

938 625 240 938 16.02 16.67 –0.64

953 625 240 953 17.35 16.67 0.68

937 625 240 937 15.93 16.67 –0.73

954 625 240 954 17.43 16.67 0.77

Overscan (Percent)

936 625 240 936 15.84 16.67 –0.82

955 625 240 955 17.52 16.67 0.85

935 625 240 935 15.75 16.67 –0.91

956 625 240 956 17.61 16.67 0.94

934 625 240 934 15.66 16.67 –1.00

957 625 240 957 17.69 16.67 1.02

933 625 240 933 15.57 16.67 –1.09

958 625 240 958 17.78 16.67 1.11

932 625 240 932 15.48 16.67 –1.18

959 625 240 959 17.86 16.67 1.20

931 625 240 931 15.39 16.67 –1.27

960 625 240 960 17.95 16.67 1.28

930 625 240 930 15.30 16.67 –1.36

961 625 240 961 18.03 16.67 1.37

962 625 240 962 18.12 16.67 1.45

929 625 240 929 15.21 16.67 –1.46

963 625 240 963 18.20 16.67 1.54

928 625 240 928 15.12 16.67 –1.55

964 625 240 964 18.29 16.67 1.62

100123B Conexant A-9

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-6. Overscan Values, 640x480 PAL, 1 Pixel Resolution, 2.5 Ps Hblank (3 of 4)

TM

Technology

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta

927 625 240 927 15.03 16.67 –1.64

925 650 231 962 18.12 19.79 –1.67

965 625 240 965 18.37 16.67 1.71

926 625 240 926 14.94 16.67 –1.73

966 625 240 966 18.46 16.67 1.79

925 625 240 925 14.84 16.67 –1.82

967 625 240 967 18.54 16.67 1.88

925 600 250 888 11.30 13.19 –1.90

924 625 240 924 14.75 16.67 –1.91

968 625 240 968 18.63 16.67 1.96

923 625 240 923 14.66 16.67 –2.01

969 625 240 969 18.71 16.67 2.04

922 625 240 922 14.57 16.67 –2.10

Overscan (Percent)

970 625 240 970 18.79 16.67 2.13

921 625 240 921 14.47 16.67 –2.19

971 625 240 971 18.88 16.67 2.21

920 625 240 920 14.38 16.67 –2.29

972 625 240 972 18.96 16.67 2.30

973 625 240 973 19.04 16.67 2.38

919 625 240 919 14.29 16.67 –2.38

974 625 240 974 19.13 16.67 2.46

918 625 240 918 14.19 16.67 –2.47

975 625 240 975 19.21 16.67 2.54

917 625 240 917 14.10 16.67 –2.57

976 625 240 976 19.29 16.67 2.63

975 600 250 936 15.84 13.19 2.65

916 625 240 916 14.01 16.67 –2.66

977 625 240 977 19.38 16.67 2.71

915 625 240 915 13.91 16.67 –2.75

A-10 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Table A-6. Overscan Values, 640x480 PAL, 1 Pixel Resolution, 2.5 Ps Hblank (4 of 4)

TM

Technology

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta

978 625 240 978 19.46 16.67 2.79

975 575 261 897 12.19 9.38 2.81

914 625 240 914 13.82 16.67 –2.85

979 625 240 979 19.54 16.67 2.87

913 625 240 913 13.72 16.67 –2.94

980 625 240 980 19.62 16.67 2.96

Table A-7. Overscan Values, 640x480 PAL, 8 Pixel Resolution, 2.5 Ps Hblank (1 of 2)

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta

944 625 240 944 16.56 16.67 –0.11

952 625 240 952 17.26 16.67 0.59

936 625 240 936 15.84 16.67 –0.82

960 625 240 960 17.95 16.67 1.28

928 625 240 928 15.12 16.67 –1.55

Overscan (Percent)

Overscan (Percent)

968 625 240 968 18.63 16.67 1.96

920 625 240 920 14.38 16.67 –2.29

976 625 240 976 19.29 16.67 2.63

912 625 240 912 13.63 16.67 –3.04

984 625 240 984 19.95 16.67 3.28

904 625 240 904 12.87 16.67 –3.80

992 625 240 992 20.60 16.67 3.93

1000 625 240 1000 21.23 16.67 4.56

896 625 240 896 12.09 16.67 –4.58

1000 620 242 992 20.60 15.97 4.62

1000 615 244 984 19.95 15.28 4.67

1000 610 246 976 19.29 14.58 4.71

1000 605 248 968 18.63 13.89 4.74

1000 600 250 960 17.95 13.19 4.75

1000 630 239 1008 21.86 17.01 4.84

1000 575 261 920 14.38 9.38 5.01

100123B Conexant A-11

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-7. Overscan Values, 640x480 PAL, 8 Pixel Resolution, 2.5 Ps Hblank (2 of 2)

TM

Technology

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta

1000 580 259 928 15.12 10.07 5.05

1000 585 257 936 15.84 10.76 5.08

1000 590 255 944 16.56 11.46 5.10

1000 595 253 952 17.26 12.15 5.11

1008 625 240 1008 21.86 16.67 5.19

888 625 240 888 11.30 16.67 –5.37

880 625 240 880 10.49 16.67 –6.18

872 625 240 872 9.67 16.67 –7.00

Table A-8. Overscan Values, 640x480 PAL, 9 Pixel Resolution, 2.5 Ps Hblank

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta

945 625 240 945 16.65 16.67 –0.02

954 625 240 954 17.43 16.67 0.77

936 625 240 936 15.84 16.67 –0.82

Overscan (Percent)

Overscan (Percent)

963 625 240 963 18.20 16.67 1.54

927 625 240 927 15.03 16.67 –1.64

972 625 240 972 18.96 16.67 2.30

918 625 240 918 14.19 16.67 –2.47

981 625 240 981 19.71 16.67 3.04

909 625 240 909 13.35 16.67 –3.32

990 625 240 990 20.44 16.67 3.77

900 650 231 936 15.84 19.79 –3.95

900 625 240 900 12.48 16.67 –4.19

999 625 240 999 21.15 16.67 4.49

891 625 240 891 11.59 16.67 –5.07

1008 625 240 1008 21.86 16.67 5.19

882 625 240 882 10.69 16.67 –5.97

873 625 240 873 9.77 16.67 –6.89

A-12 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Table A-9. Overscan Values, 800x600 NTSC (1 of 5)

TM

Technology

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta Hblank Resol

800 777 203 1184 18.45 16.46 1.98 0.00 1

800 819 193 1248 22.63 20.58 2.05 0.00 1

800 798 198 1216 20.59 18.52 2.07 0.00 1

800 756 209 1152 16.18 13.99 2.19 0.00 1

800 714 221 1088 11.25 9.05 2.20 0.00 1

800 735 215 1120 13.79 11.52 2.26 0.00 1

805 825 191 1265 23.67 21.40 2.27 0.13 1

805 780 202 1196 19.26 16.87 2.39 0.13 1

805 750 210 1150 16.03 13.58 2.45 0.14 1

805 765 206 1173 17.68 15.23 2.45 0.14 1

805 810 195 1242 22.25 19.75 2.50 0.13 1

805 720 219 1104 12.54 9.88 2.66 0.14 1

805 795 199 1219 20.79 18.11 2.68 0.13 1

805 735 215 1127 14.32 11.52 2.80 0.14 1

810 805 196 1242 22.25 19.34 2.91 0.26 1

Overscan (Percent)

Hblank and Character Clock

Resolution

810 770 205 1188 18.72 15.64 3.08 0.27 1

812 750 210 1160 16.76 13.58 3.18 0.33 1

810 735 215 1134 14.85 11.52 3.33 0.28 1

819 800 197 1248 22.63 18.93 3.70 0.48 1

815 735 215 1141 15.37 11.52 3.85 0.42 1

819 750 210 1170 17.47 13.58 3.89 0.52 1

819 775 204 1209 20.13 16.05 4.08 0.50 1

825 805 196 1265 23.67 19.34 4.33 0.63 1

819 725 218 1131 14.62 10.29 4.34 0.53 1

825 784 201 1232 21.62 17.28 4.34 0.64 1

820 735 215 1148 15.89 11.52 4.37 0.55 1

825 777 203 1221 20.92 16.46 4.46 0.65 1

825 798 198 1254 23.00 18.52 4.48 0.63 1

825 770 205 1210 20.20 15.64 4.56 0.66 1

826 750 210 1180 18.17 13.58 4.59 0.70 1

825 791 200 1243 22.32 17.70 4.62 0.64 1

825 763 207 1199 19.47 14.81 4.65 0.66 1

100123B Conexant A-13

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-9. Overscan Values, 800x600 NTSC (2 of 5)

TM

Technology

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H V V H H V Delta Hblank Resol

825 756 209 1188 18.72 13.99 4.73 0.67 1

825 749 211 1177 17.96 13.17 4.79 0.67 1

825 742 213 1166 17.19 12.35 4.84 0.68 1

825 735 215 1155 16.40 11.52 4.88 0.69 1

825 714 221 1122 13.94 9.05 4.89 0.71 1

825 728 217 1144 15.59 10.70 4.89 0.69 1

825 721 219 1133 14.77 9.88 4.90 0.70 1

833 750 210 1190 18.86 13.58 5.28 0.88 1

830 735 215 1162 16.90 11.52 5.38 0.82 1

840 780 202 1248 22.63 16.87 5.76 1.02 1

840 785 201 1256 23.12 17.28 5.84 1.01 1

835 735 215 1169 17.40 11.52 5.88 0.95 1

840 765 206 1224 21.11 15.23 5.88 1.04 1

Hblank and Character Clock

Resolution

840 790 200 1264 23.61 17.70 5.91 1.01 1

840 750 210 1200 19.53 13.58 5.95 1.06 1

840 770 205 1232 21.62 15.64 5.99 1.03 1

840 755 209 1208 20.07 13.99 6.07 1.05 1

840 775 204 1240 22.13 16.05 6.08 1.03 1

840 740 213 1184 18.45 12.35 6.10 1.07 1

840 760 208 1216 20.59 14.40 6.19 1.05 1

840 730 216 1168 17.33 11.11 6.22 1.09 1

840 745 212 1192 18.99 12.76 6.24 1.07 1

840 720 219 1152 16.18 9.88 6.30 1.10 1

840 735 215 1176 17.89 11.52 6.37 1.08 1

840 725 218 1160 16.76 10.29 6.47 1.10 1

840 715 221 1144 15.59 9.05 6.54 1.11 1

847 750 210 1210 20.20 13.58 6.62 1.23 1

850 777 203 1258 23.24 16.46 6.78 1.26 1

845 735 215 1183 18.38 11.52 6.85 1.21 1

850 756 209 1224 21.11 13.99 7.12 1.30 1

854 750 210 1220 20.85 13.58 7.27 1.41 1

850 735 215 1190 18.86 11.52 7.33 1.34 1

A-14 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Table A-9. Overscan Values, 800x600 NTSC (3 of 5)

TM

Technology

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H V V H H V Delta Hblank Resol

855 770 205 1254 23.00 15.64 7.36 1.39 1

850 714 221 1156 16.47 9.05 7.42 1.37 1

855 735 215 1197 19.33 11.52 7.81 1.46 1

861 750 210 1230 21.50 13.58 7.92 1.58 1

861 775 204 1271 24.03 16.05 7.98 1.53 1

860 735 215 1204 19.80 11.52 8.28 1.58 1

861 725 218 1189 18.79 10.29 8.50 1.63 1

868 750 210 1240 22.13 13.58 8.55 1.74 1

865 735 215 1211 20.26 11.52 8.74 1.71 1

875 762 207 1270 23.97 14.81 9.15 1.88 1

875 750 210 1250 22.75 13.58 9.17 1.91 1

870 735 215 1218 20.72 11.52 9.20 1.83 1

875 759 208 1265 23.67 14.40 9.26 1.88 1

Hblank and Character Clock

Resolution

875 747 211 1245 22.44 13.17 9.27 1.91 1

875 744 212 1240 22.13 12.76 9.37 1.92 1

875 756 209 1260 23.36 13.99 9.37 1.89 1

875 741 213 1235 21.81 12.35 9.47 1.93 1

875 753 210 1255 23.06 13.58 9.48 1.90 1

875 726 217 1210 20.20 10.70 9.50 1.97 1

875 738 214 1230 21.50 11.93 9.56 1.94 1

875 723 218 1205 19.87 10.29 9.58 1.98 1

875 735 215 1225 21.18 11.52 9.65 1.95 1

875 720 219 1200 19.53 9.88 9.66 1.99 1

875 717 220 1195 19.20 9.47 9.73 1.99 1

875 732 216 1220 20.85 11.11 9.74 1.95 1

882 750 210 1260 23.36 13.58 9.78 2.07 1

875 714 221 1190 18.86 9.05 9.80 2.00 1

875 729 217 1215 20.53 10.70 9.83 1.96 1

880 735 215 1232 21.62 11.52 10.10 2.06 1

889 750 210 1270 23.97 13.58 10.39 2.23 1

882 725 218 1218 20.72 10.29 10.43 2.14 1

885 735 215 1239 22.07 11.52 10.54 2.18 1

100123B Conexant A-15

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-9. Overscan Values, 800x600 NTSC (4 of 5)

TM

Technology

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H V V H H V Delta Hblank Resol

890 735 215 1246 22.50 11.52 10.98 2.30 1

895 735 215 1253 22.94 11.52 11.41 2.41 1

900 735 215 1260 23.36 11.52 11.84 2.52 1

900 728 217 1248 22.63 10.70 11.93 2.55 1

900 721 219 1236 21.88 9.88 12.00 2.57 1

900 714 221 1224 21.11 9.05 12.06 2.60 1

905 735 215 1267 23.79 11.52 12.27 2.63 1

903 725 218 1247 22.57 10.29 12.28 2.62 1

910 720 219 1248 22.63 9.88 12.75 2.80 1

925 714 221 1258 23.24 9.05 14.19 3.16 1

800 777 203 1184 18.45 16.46 1.98 0.00 8

800 819 193 1248 22.63 20.58 2.05 0.00 8

800 798 198 1216 20.59 18.52 2.07 0.00 8

Hblank and Character Clock

Resolution

800 756 209 1152 16.18 13.99 2.19 0.00 8

800 714 221 1088 11.25 9.05 2.20 0.00 8

800 735 215 1120 13.79 11.52 2.26 0.00 8

840 780 202 1248 22.63 16.87 5.76 1.02 8

840 785 201 1256 23.12 17.28 5.84 1.01 8

840 765 206 1224 21.11 15.23 5.88 1.04 8

840 790 200 1264 23.61 17.70 5.91 1.01 8

840 750 210 1200 19.53 13.58 5.95 1.06 8

840 770 205 1232 21.62 15.64 5.99 1.03 8

840 755 209 1208 20.07 13.99 6.07 1.05 8

840 775 204 1240 22.13 16.05 6.08 1.03 8

840 740 213 1184 18.45 12.35 6.10 1.07 8

840 760 208 1216 20.59 14.40 6.19 1.05 8

840 730 216 1168 17.33 11.11 6.22 1.09 8

840 745 212 1192 18.99 12.76 6.24 1.07 8

840 720 219 1152 16.18 9.88 6.30 1.10 8

840 735 215 1176 17.89 11.52 6.37 1.08 8

840 725 218 1160 16.76 10.29 6.47 1.10 8

840 715 221 1144 15.59 9.05 6.54 1.11 8

A-16 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Table A-9. Overscan Values, 800x600 NTSC (5 of 5)

TM

Technology

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H V V H H V Delta Hblank Resol

880 735 215 1232 21.62 11.52 10.10 2.06 8

810 805 196 1242 22.25 19.34 2.91 0.26 9

810 770 205 1188 18.72 15.64 3.08 0.27 9

810 735 215 1134 14.85 11.52 3.33 0.28 9

819 800 197 1248 22.63 18.93 3.70 0.48 9

819 750 210 1170 17.47 13.58 3.89 0.52 9

819 775 204 1209 20.13 16.05 4.08 0.50 9

819 725 218 1131 14.62 10.29 4.34 0.53 9

855 770 205 1254 23.00 15.64 7.36 1.39 9

855 735 215 1197 19.33 11.52 7.81 1.46 9

882 750 210 1260 23.36 13.58 9.78 2.07 9

882 725 218 1218 20.72 10.29 10.43 2.14 9

900 735 215 1260 23.36 11.52 11.84 2.52 9

Hblank and Character Clock

Resolution

900 728 217 1248 22.63 10.70 11.93 2.55 9

900 721 219 1236 21.88 9.88 12.00 2.57 9

900 714 221 1224 21.11 9.05 12.06 2.60 9

Table A-10. Overscan Values, 800x600, PAL, > 2.5 Ps Hblank (1 of 3)

Controller Pixels Encoder Pixels

Total Active Total

H V V H H V Delta Resol

945 750 250 1134 13.17 13.19 –0.02 1

950 750 250 1140 13.63 13.19 0.44 1

950 775 242 1178 16.42 15.97 0.44 1

940 750 250 1128 12.71 13.19 –0.48 1

950 725 259 1102 10.65 10.07 0.58 1

950 800 235 1216 19.03 18.40 0.63 1

950 825 228 1254 21.48 20.83 0.65 1

955 750 250 1146 14.08 13.19 0.89 1

Overscan (Percent)

Character

Clock

935 750 250 1122 12.24 13.19 –0.95 1

960 750 250 1152 14.53 13.19 1.34 1

930 750 250 1116 11.77 13.19 –1.42 1

100123B Conexant A-17

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Table A-10. Overscan Values, 800x600, PAL, > 2.5 Ps Hblank (2 of 3)

TM

Technology

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H V V H H V Delta Resol

925 825 228 1221 19.36 20.83 –1.47 1

925 800 235 1184 16.84 18.40 –1.56 1

965 750 250 1158 14.97 13.19 1.78 1

925 775 242 1147 14.16 15.97 –1.81 1

925 750 250 1110 11.30 13.19 –1.90 1

970 750 250 1164 15.41 13.19 2.22 1

920 750 250 1104 10.81 13.19 –2.38 1

975 775 242 1209 18.56 15.97 2.59 1

975 750 250 1170 15.84 13.19 2.65 1

975 800 235 1248 21.10 18.40 2.70 1

915 750 250 1098 10.33 13.19 –2.87 1

975 725 259 1131 12.94 10.07 2.87 1

980 750 250 1176 16.27 13.19 3.08 1

Character

Clock

910 750 250 1092 9.83 13.19 –3.36 1

985 750 250 1182 16.70 13.19 3.50 1

900 825 228 1188 17.12 20.83 –3.71 1

905 750 250 1086 9.34 13.19 –3.86 1

900 800 235 1152 14.53 18.40 –3.87 1

990 750 250 1188 17.12 13.19 3.93 1

900 775 242 1116 11.77 15.97 –4.20 1

995 750 250 1194 17.54 13.19 4.34 1

1000 785 239 1256 21.61 17.01 4.59 1

1000 775 242 1240 20.60 15.97 4.62 1

1000 750 250 1200 17.95 13.19 4.75 1

1000 780 241 1248 21.10 16.32 4.79 1

1000 760 247 1216 19.03 14.24 4.79 1

1000 770 244 1232 20.08 15.28 4.80 1

1000 745 252 1192 17.40 12.50 4.90 1

1000 730 257 1168 15.70 10.76 4.94 1

1000 755 249 1208 18.49 13.54 4.95 1

1000 765 246 1224 19.56 14.58 4.97 1

960 750 250 1152 14.53 13.19 1.34 8

A-18 Conexant 100123B

Bt868/Bt869 Appendix A . Scaling and I/O Timing Register Calculations

Flicker-Free Video Encoder with Ultrascale

Table A-10. Overscan Values, 800x600, PAL, > 2.5 Ps Hblank (3 of 3)

TM

Technology

Controller Pixels Encoder Pixels

Overscan (Percent)

Total Active Total

H V V H H V Delta Resol

920 750 250 1104 10.81 13.19 –2.38 8

1000 785 239 1256 21.61 17.01 4.59 8

1000 775 242 1240 20.60 15.97 4.62 8

1000 750 250 1200 17.95 13.19 4.75 8

1000 780 241 1248 21.10 16.32 4.79 8

1000 760 247 1216 19.03 14.24 4.79 8

1000 770 244 1232 20.08 15.28 4.80 8

1000 745 252 1192 17.40 12.50 4.90 8

1000 730 257 1168 15.70 10.76 4.94 8

1000 755 249 1208 18.49 13.54 4.95 8

1000 765 246 1224 19.56 14.58 4.97 8

1000 740 254 1184 16.84 11.81 5.03 8

1000 725 259 1160 15.12 10.07 5.05 8

Character

Clock

1000 720 261 1152 14.53 9.38 5.15 8

1000 735 256 1176 16.27 11.11 5.16 8

1000 715 263 1144 13.93 8.68 5.25 8

1040 750 250 1248 21.10 13.19 7.91 8

945 750 250 1134 13.17 13.19 –0.02 9

900 825 228 1188 17.12 20.83 –3.71 9

900 800 235 1152 14.53 18.40 –3.87 9

990 750 250 1188 17.12 13.19 3.93 9

900 775 242 1116 11.77 15.97 –4.20 9

1035 750 250 1242 20.72 13.19 7.53 9

100123B Conexant A-19

Appendix A . Scaling and I/O Timing Register Calculations Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

TM

Technology

A-20 Conexant 100123B

B

Appendix B. Approved Crystal Vendors

Conexant conducted a series of internal tests and used the results to generate this
list of approved crystal vendors. Contact your local Conexant Field Applications
Engineer for additional details.

Standard Crystal (El Monte, CA)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: AAK13M500000GXE20A
Half-Height/50 ppm: AAL13M500000GXE20A
Full Height/25 ppm: Did Not Qualify

MMD Components (Irvine, CA)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50ppm Total Tolerance: A20BA1-13.500 MHz.
Half-Height/50 ppm: B20BA1-13,500 MHz
Full Height/25 ppm: Did Not Qualify

General Electronics (San Marcos, CA)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: PKHC49/U-13.500-.020-.005
Half-Height/50 ppm: PKHC49/US-13.500-.020-.005
Full Height/25 ppm: PKHC49/U-13.500-.0025-15R

Fox Electronics (Fort Myers, FL)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: HC49U-13.500 MHz-/50/0/70/20 pF
Half Height/50 ppm: HC49S 13.500-/50/0/70/20 pF
Full Height/25 ppm: HC49U 13.500-/25/0/70/20 pF

100123B Conexant B-1

Appendix B . Approved Crystal Vendors Bt868/Bt869

Flicker-Free Video Encoder with Ultrascale

Bomar (Middlesex, NJ)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: BRC1C14F-13.50000
Half Height/50 ppm: ACR-49S012025-13.50000
Full Height/25 ppm: BRCIE14F-13.50000

HY-Q (Erlanger, Kentucky)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: HT81818/01

Half Height/50 ppm: SC30002/01

Full Height/25 ppm:

Phone Number: [phone] / [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: HC49U-25/25-13.500-20
Half Height/50 ppm: HC49US-FB1F20-13.500
Full Height/25 ppm: Did Not Qualify

HT81819/01

ILSI America (Kirkland, WA)

TM

Technology

Cardinal Components (Wayne, NJ)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: C49-A4BRC7-25-13.5D20
Half Height/50 ppm: CLP-A4B6C4-50-13.5D20
Full Height/25 ppm: C49-A4B6C4-25-13.5D20

Raltron Electronics Corp. (Miami, FL)

Phone Number: [phone]
FAX Number: [phone]
E-mail: [e-mail]
Part Numbers for 13.500 MHz, Fundamental, 20pF Load Crystal with an HC49U Type of Package:
Full Height/50 ppm Total Tolerance: A-13.500-20-RS1
Half Height/50 ppm: AS-13.500-20-RS1
Full Height/25 ppm: A-13.500-20-RS1

Valpey-Fisher (Hopkinton, MA)

Phone Number: [phone]
FAX Number: [phone]

B-2 Conexant 100123B