CDB4955A Cirrus Logic Inc, CDB4955A Datasheet - Page 22

• Manufacturer Part Number: CDB4955A
• Description: EVALUATION BOARD FOR CS4955A
• Manufacturer: Cirrus Logic Inc

Specifications of CDB4955A

• Main Purpose: Video, Video Processing
• Embedded: Yes, Other
• Utilized Ic / Part: CS4955
• Primary Attributes: NTSC/PAL Digital Video Encoder
• Secondary Attributes: Graphical User Interface, RS-232 Interface
• Operating Frequency: 27 MHz
• Interface Type: RS-232, Composite, RGB, S-Video
• Operating Supply Voltage: 3.3 V, 5 V
• Software: Software Included
• Silicon Manufacturer: Cirrus Logic
• Silicon Core Number: CS4955
• Kit Application Type: Audio / Video / TV
• Application Sub Type: Encoder / Decoder
• Kit Contents: Evaluation Board
• Rohs Compliant: No
• For Use With/related Products: CS4954
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

5.6
The CS4954/5 automatically synthesizes NTSC
and PAL color subcarrier clocks using the CLK fre-
quency
(SC_SYNTH0/1/2/3). The NTSC subcarrier syn-
thesizer is reset every four fields (every eight fields
for PAL).
22
ITU R.BT656
DATA
Subcarrier Generation
V[7:0]
and
309
309
Active Video
308
308
Y
310
310
Cr
309
309
Burst Phase = 135 degrees relative to U
four
Y FF 00 00 XY 80 10 80 10
311
311
310
310
Figure 10. PAL Video Non-Interlaced Progressive Scan Timing
EAV Code
4 Clocks
312
312
311
311
control
Figure 11. CCIR656 Input Mode Timing
312
312
VSYNC Drops
313
313
Analog
Field 1
Analog
Field 2
Analog
Field 3
Analog
Field 4
1
1
1
1
registers
Composite
Video
2
2
2
2
80
268 Clocks (NTSC)
280 Clocks (PAL)
Horizontal Blanking
Ancilliary Data
10 80 10 80 10
3
3
3
3
The SC_SYNTH0/1/2/3 registers used together
provide a 32-bit value that defaults to NTSC
(43E0F83Eh) following RESET. Table
the 32-bit value required for each of the different
broadcast formats.
4
4
4
4
Burst Phase = 225 degrees relative to U
5
5
5
5
80 10 80 10 FF 00 00 XY Cb Y Cr Cb Y Cr
6
6
6
6
7
7
7
7
SAV Code
4 Clocks
CS4954 CS4955
23
23
23
23
Active Video
24
24
24
24
1440 Clocks
4
DS278F6
shows