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CS4954
CS4955
NTSC/PAL Digital Video Encoder
Features
Description
l Six DACs providing simultaneous composite,
S-video, and RGB or Component YUV
outputs
l Programmable DAC output currents for low
imped-ance (37.5 ) and high impedance
(150 ) loads.
l Multi-standard support for NTSC-M, NTSC-
JAPAN, PAL (B, D, G, H, I, M, N,
Combination N)
l ITU R.BT656 input mode supporting
EAV/SAV codes and CCIR601 Master/Slave
input modes
l Programmable HSYNC and VSYNC timing
l Multistandard Teletext (Europe, NABTS,
WST) support
l VBI encoding support
l Wide-Screen Signaling (WSS) support, EIA-J
CPX1204
l NTSC closed caption encoder with interrupt
l CS4955 supports Macrovision copy
protection Version 7
The CS4954/5 provides full conversion from digital video
formats YCbCr or YUV into NTSC and PAL Composite,
Y/C (S-video) and RGB, or YUV analog video. Input for-
mats can be 27 MHz 8-bit YUV, 8-bit YCbCr, or ITU
R.BT656 with support for EAV/SAV codes. Video output
can be formatted to be compatible with NTSC-M, NTSC-
J, PAL-B,D,G,H,I,M,N, and Combination N systems.
Closed Caption is supported in NTSC. Teletext is sup-
ported for NTSC and PAL.
Six 10-bit DACs provide two channels for an S-Video
output port, one or two composite video outputs, and
three RGB or YUV outputs. Two-times oversampling re-
duces the output filter requirements and guarantees no
DAC-related modulation components within the speci-
fied bandwidth of any of the supported video standards.
Parallel or high-speed I2C compatible control interfaces are
provided for flexibility in system design. The parallel interface
doubles as a general purpose I/O port when the CS4954/5 is
in I2C mode to help conserve valuable board area.
ORDERING INFORMATION
CS4954-CQ
CS4955-CQ
48-pin TQFP
48-pin TQFP
l Host interface configurable
for parallel or I2C
compatible operation
l On-chip voltage reference
generator
l +3.3 V or +5 V operation,
CMOS, low-power modes,
tri-state DACs
CLK
SCL
SDA
PDAT[7:0]
RD
WR
ADDR
XTAL_IN
XTAL_OUT
TTXDAT
TTXRQ
VD[7:0]
HSYNC
VSYNC
FIELD
INT
RESET
VAA
I2C Interface
Output LPF
Interpolate
10-Bit
DAC
8
Host
Parallel
Interface
Control
Registers
Color Sub-carrier Synthesizer
Teletext
Encoder
YCbCr to RBG
Color Space
Converter
8
Video Formatter
Chroma Amplifier Σ
Chroma Modulate
Burst Insert
Chroma Interpolate
U,V LPF
Y Luma Interpolate
10-Bit
DAC
10-Bit
DAC
10-Bit
DAC
10-Bit
DAC
10-Bit
DAC
Video Timing
Generator
RGB
Luma Amplifier
Y
Sync Insert
Y
RGB
Voltage
Reference
Current
Reference
C
CVBS
Y
R
G
B
VREF
ISET
DGND
TEST
Preliminary Product Information
Cirrus Logic, Inc.
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.crystal.com
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright © Cirrus Logic, Inc. 1999
(All Rights Reserved)
APR ‘99
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CS4954 CS4955
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ..................................................................5
AC & DC PARAMETRIC SPECIFICATIONS ......................................................................5
RECOMMENDED OPERATING CONDITIONS ..................................................................... 5
DC CHARACTERISTICS ....................................................................................................5
AC CHARACTERISTIC .......................................................................................................7
TIMING CHARACTERISTICS .............................................................................................8
2. ADDITIONAL CS4954/5 FEATURES ...............................................................................10
3. CS4954 INTRODUCTION .................................................................................................10
4. FUNCTIONAL DESCRIPTION .........................................................................................10
4.1. Video Timing Generator .........................................................................................10
4.2. Video Input Formatter .............................................................................................11
4.3. Color Subcarrier Synthesizer ..................................................................................11
4.4. Chroma Path ..........................................................................................................11
4.5. Luma Path ..............................................................................................................12
4.6. RGB Path and Component YUV Path ....................................................................12
4.7. Digital to Analog Converters ...................................................................................12
4.8. Voltage Reference ..................................................................................................13
4.9. Current Reference ..................................................................................................13
4.10. Host Interface .........................................................................................................13
4.11. Closed Caption Services ........................................................................................13
4.12. Teletext Services ....................................................................................................14
4.13. Wide-Screen Signaling Support and CGMS ...........................................................14
4.14. VBI Encoding ..........................................................................................................14
4.15. Control Registers ....................................................................................................14
4.16. Testability ...............................................................................................................14
5. OPERATIONAL DESCRIPTION .......................................................................................14
5.1. Reset Hierarchy ......................................................................................................14
5.2. Video Timing ...........................................................................................................15
5.2.1. Slave Mode Input Interface ..........................................................................15
5.2.2. Master Mode Input Interface ........................................................................15
5.2.3. Vertical Timing .............................................................................................16
5.2.4. Horizontal Timing .........................................................................................16
5.2.5. NTSC Interlaced ..........................................................................................16
5.2.6. PAL Interlaced .............................................................................................16
5.2.7. Progressive Scan .........................................................................................17
5.2.8. NTSC Progressive Scan ..............................................................................17
5.2.9. PAL Progressive Scan .................................................................................18
5.3. ITU-R.BT656 ..........................................................................................................18
5.4. Digital Video Input Modes .......................................................................................21
5.5. Multi-standard Output Format Modes .....................................................................21
5.6. Subcarrier Generation ............................................................................................21
5.7. Subcarrier Compensation .......................................................................................21
5.8. Closed Caption Insertion ........................................................................................22
5.9. Programmable H-sync and V-sync .........................................................................22
5.10. Wide Screen Signaling (WSS) and CGMS .............................................................23
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:
http://www.cirrus.com/corporate/contacts/
Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product infor-
mation describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure that the information
contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of
any kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights
of third parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of
this publication may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or
otherwise) without the prior written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user. However, no
part of the printout or electronic files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical,
photographic, or otherwise) without the prior written consent of Cirrus Logic, Inc.Furthermore, no part of this publication may be used as a basis for manufacture
or sale of any items without the prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing
in this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trade-
marks and service marks can be found at http://www.cirrus.com.
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5.11. Teletext Support ..................................................................................................... 23
5.12. Color Bar Generator ............................................................................................... 25
5.13. VBI encoding .......................................................................................................... 25
5.14. Super White/Super Black support .......................................................................... 26
5.15. Interrupts ................................................................................................................ 26
5.16. General Purpose I/O Port ....................................................................................... 26
6. FILTER RESPONSES ...................................................................................................... 27
7. ANALOG .......................................................................................................................... 30
7.1. Analog Timing ........................................................................................................ 30
7.2. VREF ...................................................................................................................... 30
7.3. ISET ....................................................................................................................... 30
7.4. DACs ...................................................................................................................... 30
7.4.1. Luminance DAC .......................................................................................... 30
7.4.2. Chrominance DAC ...................................................................................... 30
7.4.3. CVBS DAC .................................................................................................. 31
7.4.4. Red DAC ..................................................................................................... 31
7.4.5. Green DAC .................................................................................................. 31
7.4.6. Blue DAC ..................................................................................................... 31
8. PROGRAMMING .............................................................................................................. 32
8.1. Host Control Interface ............................................................................................ 32
8.1.1. I2C Interface ................................................................................................ 32
8.1.2. 8-bit Parallel Interface ................................................................................. 33
8.2. Register Description ............................................................................................... 34
8.2.1. Control Registers ......................................................................................... 34
9. BOARD DESIGN AND LAYOUT CONSIDERATIONS .................................................... 50
9.1. Power and Ground Planes ..................................................................................... 50
9.2. Power Supply Decoupling ...................................................................................... 50
9.3. Digital Interconnect ................................................................................................ 50
9.4. Analog Interconnect ............................................................................................... 50
9.5. Analog Output Protection ....................................................................................... 51
9.6. ESD Protection ....................................................................................................... 51
9.7. External DAC Output Filter ..................................................................................... 51
10. PIN DESCRIPTION ......................................................................................................... 53
11. PACKAGE DRAWING ...................................................................................................... 55
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CS4954 CS4955
TABLE OF FIGURES
1. Video Pixel Data and Control Port Timing .........................................................................7
2. I2C Host Port Timing ..........................................................................................................8
3. Reset Timing ......................................................................................................................9
4. ITU R.BT601 Input Slave Mode Horizontal Timing ..........................................................15
5. ITU R.BT601 Input Master Mode Horizontal Timing ........................................................15
6. Vertical Timing .................................................................................................................17
7. NTSC Video Interlaced Timing ........................................................................................18
8. PAL Video Interlaced Timing ...........................................................................................19
9. NTSC Video Non-Interlaced Progressive Scan Timing ...................................................20
10. PAL Video Non-Interlaced Progressive Scan Timing ......................................................20
11. CCIR656 Input Mode Timing ...........................................................................................21
12. Teletext Timing (Pulsation Mode) ....................................................................................24
13. Teletext Timing (Window Mode) ......................................................................................24
14. 1.3 Mhz Chrominance low-pass filter transfer characteristic ...........................................27
15. 1.3 Mhz Chrominance low-pass filter transfer characterstic (passband) .........................27
16. 650 kHz Chrominance low-pass filter transfer characteristic ...........................................27
17. 650 kHz Chrominance low-pass filter transfer characteristic (passband) ........................27
18. Chrominance output interpolation filter transfer characteristic (passband) ......................28
19. Luminance interpolation filter transfer characteristic .......................................................28
20. Luminance interpolation filter transfer characterstic (passband) .....................................28
21. Chrominance interpolation filter transfer characteristic for RGB datapath .......................28
22. Chroma Interpolator for RGB Datapath when rgb_bw=1 (Reduced Bandwidth) .............29
23. Chroma Interpolator for RGB Datapath when rgb_bw=1 (Reduced Bandwidth) .............29
24. Chroma Interpolator for RGB Datapath when rgb_bw=0 -3 dB .......................................29
25. Chroma Interpolator for RGB Datapath when rgb_bw=0 (Full Scale) ..............................29
26. I2C Protocol .....................................................................................................................32
27. 8-bit Parallel Host Port Timing: Read-Write/Write-Read Cycle ........................................33
28. 8-bit Parallel Host Port Timing: Address Read Cycle ......................................................33
29. 8-bit Parallel Host Port Timing: Address Write Cycle .......................................................34
30. External Low Pass Filter C2 should be chosen so that C1 = C2 + Ccable .........................51
31. Typical Connection Diagram ............................................................................................52
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1. CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
AC & DC PARAMETRIC SPECIFICATIONS (AGND,DGND = 0 V, all voltages with respect to 0 V)
Parameter
Symbol
Min
Max Units
Power Supply
VAA/VDD -0.3
6.0
V
Input Current Per Pin (Except Supply Pins)
-10 10 mA
Output Current Per Pin (Except Supply Pins)
-50 +50 mA
Analog Input Voltage
-0.3 VAA + 0.3
V
Digital Input Voltage
-0.3 VDD + 0.3
V
Ambient Temperature Power Applied
-55 + 125 °C
Storage Temperature
-65 + 150 °C
WARNING: Operating beyond these limits can result in permanent damage to the device. Normal operation is not
guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS (AGND,DGND = 0 V, all voltages with respect to 0 V.)
Parameter
Power Supplies: Digital Analog
Operating Ambient Temperature
Symbol
VAA/VDD
TA
Min
3.15
4.75
0
Typ
3.3
5.0
+ 25
Max
3.45
5.25
+ 70
Units
V
°C
Note: Operation outside the ranges is not recommended.
DC CHARACTERISTICS (TA = 25° C; VAA, VDD = 5 V; GNDA, GNDD = 0 V.)
Parameter
Symbol Min Typ
Digital Inputs
High level Input Voltage
V [7:0], PDAT [7:0], Hsync/Vsync/Field/CLKIN
VIH 2.2 -
High Level Input Voltage I2C
VIH 0.7 VDD -
Low level Input Voltage All Inputs
- -0.3 -
Input Leakage Current
- -10 -
Digital Outputs
High Level Output Voltage lo = -4 mA
VOH
2.4
-
Low level Output Voltage lo = 4 mA
VOL - -
Low Level Output Voltage SDA pin only, lo = 6mA
VOL - -
Output Leakage Current High -Z Digital Outputs
- -10 -
Max Units
VDD+0.3 V
-V
0.8 V
+10 µA
VDD
0.4
0.4
+ 10
V
V
V
µA
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