CS4955-CQZ 查看數據表（PDF） - Cirrus Logic
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CS4955-CQZ Datasheet PDF : 60 Pages
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CS4954 CS4955
VSYNC Drops
Analog
Field 1
309 310 311 312 313 1
2
3
4
5
Analog
Field 2
6
7
308 309 310 311 312
1
2
3
4
5
6
7
23
24
23
24
Analog
Field 3
309 310 311 312 313 1
2
3
4
5
Analog
Field 4
6
7
23
24
308 309 310 311 312
1
2
3
4
5
6
7
23
24
Burst Phase = 135 degrees relative to U
Burst Phase = 225 degrees relative to U
Figure 10. PAL Video Non-Interlaced Progressive Scan Timing
Composite
Video
ITU R.BT656
DATA
V[7:0]
Y Cr Y FF 00 00 XY 80 10 80 10
EAV Code
80 10 80 10 80 10
Ancilliary Data
80 10 80 10 FF 00 00 XY Cb Y Cr Cb Y Cr
SAV Code
Active Video
4 Clocks
268 Clocks (NTSC)
280 Clocks (PAL)
Horizontal Blanking
4 Clocks
1440 Clocks
Active Video
Figure 11. CCIR656 Input Mode Timing
5.6 Subcarrier Generation
The CS4954/5 automatically synthesizes NTSC
and PAL color subcarrier clocks using the CLK fre-
quency and four control registers
(SC_SYNTH0/1/2/3). The NTSC subcarrier syn-
thesizer is reset every four fields (every eight fields
for PAL).
The SC_SYNTH0/1/2/3 registers used together
provide a 32-bit value that defaults to NTSC
(43E0F83Eh) following RESET. Table 4 shows
the 32-bit value required for each of the different
broadcast formats.
22
DS278F6
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