參數(shù)資料
型號: CS4955-CQZR
廠商: Cirrus Logic Inc
文件頁數(shù): 15/60頁
文件大?。?/td> 0K
描述: IC VID ENCODER NTSC/PAL 48-TQFP
標(biāo)準(zhǔn)包裝: 2,000
類型: 視頻編碼器
電壓 - 電源,模擬: 3.15 V ~ 5.25 V
電壓 - 電源,數(shù)字: 3.15 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應(yīng)商設(shè)備封裝: 48-TQFP(7x7)
包裝: 帶卷 (TR)
CS4954 CS4955
22
DS278F6
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.
309
310
311
Analog
Field 1
Burst Phase = 135 degrees relative to U
Burst Phase = 225 degrees relative to U
312
313
1
2
3
4
5
6
7
23
24
309
Analog
Field 2
308
311
312
VSYNC Drops
12
3
4
5
6
7
23
24
310
309
310
311
Analog
Field 3
312
313
1
2
3
4
5
6
7
23
24
309
Analog
Field 4
308
311
312
12
3
4
5
6
7
23
24
310
Figure 10. PAL Video Non-Interlaced Progressive Scan Timing
Y
Cr Y FF 00 00 XY 80 10 80 10
80 10 80 10 80 10
80 10 80 10 FF 00 00 XY Cb Y Cr Cb Y Cr
1440 Clocks
Active Video
SAV Code
Composite
Video
Ancilliary Data
268 Clocks (NTSC)
280 Clocks (PAL)
Horizontal Blanking
EAV Code
4 Clocks
Active Video
V[7:0]
ITU R.BT656
4 Clocks
Figure 11. CCIR656 Input Mode Timing
DATA
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