Advance Information
This document contains information on a product under development. The para-
metric information contains target parameters that are subject to change.
Bt829A/827A
VideoStream II Decoders
Bt829A–
Video Capture Processor & Scaler for
TV/VCR Analog Input
Bt827A–
Composite Video and S-Video Decoder
The Bt829A and Bt827A VideoStream™ Decoders are a family of single-chip, pin-
and register-compatible, composite NTSC/PAL/SECAM video and S-Video decod-
ers. They are also pin and register backward compatible with the Bt829/827 family
of products. Low operating power consumption and power-down capability make
them ideal low-cost solutions for PC video capture applications on both desktop and
portable system platforms. They support square pixel and CCIR601 resolutions for
NTSC, PAL and SECAM video. They have a flexible pixel port which supports a
variety of system interface configurations, and they are offered in 100-pin PQFP and
100-pin TQFP packages.
Distinguishing Features
• Single-chip composite/S-Video
NTSC/PAL/SECAM to YCrCb digitizer
• On-chip Ultralock
™
• Square pixel and CCIR601 resolution for:
– NTSC (M)
– NTSC (M) without 7.5IRE pedestal
– PAL (B, D, G, H, I, M, N, N
combination)
– SECAM
• Chroma comb filter
• Arbitrary horizontal and 5-tap vertical
filtered scaling
• Hardware closed-caption decoder
• Vertical Blanking Interval (VBI) data
pass-through
• Arbitrary temporal decimation for a
reduced frame-rate video sequence
• Programmable hue, brightness, saturation,
and contrast
• User-programmable cropping of the video
window
• 2x oversampling to simplify external
analog filtering
• Two-wire Inter-Integrated Circuit (I
2
C)
bus interface
• 8- or 16-bit pixel interface
• YCrCb (4:2:2) output format
• Software selectable four-input analog
MUX
• 4 fully programmable GPIO bits
• Auto NTSC/PAL format detect
• Automatic Gain Control (AGC)
• Typical power consumption 0.85 W
• IEEE 1149.1 Joint Test Action Group
(JTAG) interface
• 100-Pin PQFP and TQFP packages
Functional Block Diagram
XT0
MUX0
MUX1
MUX2
MUX3
MUXOUT
SYNCDET
REFOUT
YREF+
YIN
YREF–
CREF+
CIN
CREF–
XT1
Analog
MUX
AGC
Decimation LPF
Output Formatting
Ultralock™
and
Clock
Generation
I
2
C
JTAG
Video
Timing
Video
Timing
Unit
40 MHz
ADC
Output
Control
40 MHz
ADC
Luma-Chroma
Separation
and
Chroma
Demodulation
Spatial and
Temporal
Scaling
16
Output
Data
Related Products
• Bt819A, Bt829, Bt856/857, Bt864/865,
Bt866/867, Bt852
Applications
•
•
•
•
•
•
Multimedia
Image processing
Desktop video
Video phone
Teleconferencing
Interactive video
Ordering Information
Model Number
Bt829AKRF
Bt827AKRF
Bt829AKTF
Package
100-pin PQFP
100-pin PQFP
100-pin TQFP
Ambient Temperature Range
0˚C to +70˚C
0˚C to +70˚C
0˚C to +70˚C
Copyright © 1997 Rockwell Semiconductor Systems. All rights reserved.
Print date: November, 1997
Rockwell reserves the right to make changes to its products or specifications to improve performance, reliability, or
manufacturability. Information furnished by Rockwell Semiconductor Systems is believed to be accurate and reliable. However, no
responsibility is assumed by Rockwell Semiconductor Systems for its use; nor for any infringement of patents or other rights of
third parties which may result from its use. No license is granted by its implication or otherwise under any patent or patent rights of
Rockwell Semiconductor Systems.
Rockwell products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a
Rockwell product can reasonably be expected to result in personal injury or death. Rockwell customers using or selling Rockwell
products for use in such applications do so at their own risk and agree to fully indemnify Rockwell for any damages resulting from
such improper use or sale.
Bt is a registered trademark of Rockwell Semiconductor Systems. Product names or services listed in this publication are for
identification purposes only, and may be trademarks or registered trademarks of their respective companies. All other marks
mentioned herein are the property of their respective holders.
Specifications are subject to change without notice.
PRINTED IN THE UNITED STATES OF AMERICA
T
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List of Figures
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
List of Tables
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x
Functional Description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Functional Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Bt829A Video Capture Processor for TV/VCR Analog Input. . . . . . . . . . . . . . . . . . . .
Bt827A Composite/S-Video Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bt829A Architecture and Partitioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UltraLock
™
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scaling and Cropping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VBI Data Pass-through . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Closed Caption Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
2
C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
3
4
4
4
5
5
5
5
Pin Descriptions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Differences Between Bt829/827 and Bt829A/827A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
UltraLock™
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
The Challenge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operation Principles of UltraLock™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Composite Video Input Formats
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Y/C Separation and Chroma Demodulation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Video Scaling, Cropping, and Temporal Decimation
. . . . . . . . . . . . . . . . . . . . . . . . . . 18
Horizontal and Vertical Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Luminance Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peaking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chrominance Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scaling Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Image Cropping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cropping Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temporal Decimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
18
21
23
23
26
28
29
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VideoStream II Decoders
Video Adjustments
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
The Hue Adjust Register (HUE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Contrast Adjust Register (CONTRAST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Saturation Adjust Registers (SAT_U, SAT_V) . . . . . . . . . . . . . . . . . . . . . . . . . .
The Brightness Register (BRIGHT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VBI Line Output Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VBI Frame Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
31
31
31
32
32
34
34
38
Bt829A VBI Data Output Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Closed Captioning and Extended Data Services Decoding
. . . . . . . . . . . . . . . . . . . . 39
Automatic Chrominance Gain Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Low Color Detection and Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Coring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Electrical Interfaces
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Input Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Analog Signal Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiplexer Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Autodetection of NTSC or PAL/SECAM Video . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash A/D Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/D Clamping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-up Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Gain Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crystal Inputs and Clock Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2X Oversampling and Input Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
YCrCb Pixel Stream Format, SPI Mode 8- and 16-bit Formats. . . . . . . . . . . . . . . . .
Synchronous Pixel Interface (SPI, Mode 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synchronous Pixel Interface (SPI, Mode 2, ByteStream™) . . . . . . . . . . . . . . . . . . .
CCIR601 Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting and Stopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Addressing the Bt829A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading and Writing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
43
43
44
44
44
44
47
50
51
51
53
54
57
58
58
59
61
Output Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
I
2
C Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
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VideoStream II Decoders
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JTAG Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Need for Functional Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JTAG Approach to Testability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Device ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Verification with the Tap Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example BSDL Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
62
62
62
63
64
PC Board Layout Considerations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Ground Planes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Planes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Signal Interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Signal Interconnect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Latch-up Avoidance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sample Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67
68
68
70
70
70
70
L829A_B
v
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