参数资料
型号: ADV7171KSUZ
厂商: Analog Devices Inc
文件页数: 37/64页
文件大小: 0K
描述: IC DAC VIDEO ENC NTSC 44TQFP
产品培训模块: Interfacing AV Converters to Blackfin Processors
标准包装: 1
类型: 视频编码器
应用: 机顶盒,视频播放器
电压 - 电源,模拟: 4.75 V ~ 5.25 V
安装类型: 表面贴装
封装/外壳: 44-TQFP
供应商设备封装: 44-TQFP(10x10)
包装: 托盘
产品目录页面: 786 (CN2011-ZH PDF)
ADV7170/ADV7171
Rev. C | Page 42 of 64
APPENDIX 4—WIDE SCREEN SIGNALING
The ADV7170/ADV7171 support wide screen signaling (WSS) conforming to the standard. WSS data is transmitted on Line 23.
WSS data can only be transmitted when the ADV7170/ADV7171 are configured in PAL mode. The WSS data is 14 bits long; the function
of each of these bits is as shown below.
The WSS data is preceded by a run-in sequence and a start code (see Figure 58). The bits are output from the configuration registers in
the following order:
C/W20 = W0, C/W21 = W1, C/W22 = W2, C/W23 = W3, C/W24 = W4, C/W25 = W5, C/W26 = W6, C/W27 = W7, C/W10 = W8,
C/W11 = W9, C/W12 = W10, C/W13 = W11, C/W14 = W12, C/W15 = W13.
If Bit C/W07 is set to a Logic Level 1, it enables the WSS data to be transmitted on Line 23. The latter portion of Line 23 (42.5 μs from the
falling edge of HSYNC) is available for the insertion of video.
Function of CGMS Bits
Bit 0 to Bit 2
Aspect Ratio/Format/Position
Bit 3 is odd parity check of Bit 0 to Bit 2
B0
B1
B2
B3
Aspect Ratio
Format
Position
0
1
4:3
Full format
Nonapplicable
1
0
14:9
Letterbox
Center
0
1
0
14:9
Letterbox
Top
1
0
1
16:9
Letterbox
Center
0
1
0
16:9
Letterbox
Top
1
0
1
>16:9
Letterbox
Center
0
1
14:9
Full format
Center
1
0
16:9
Nonapplicable
B4
0
Camera Mode
1
Film Mode
B5
0
Standard Coding
1
Motion Adaptive Color Plus
B6
0
No Helper
1
Modulated Helper
B7
RESERVED
B9
B10
0
No open subtitles
1
0
Subtitles in active image area
0
1
Subtitles out of active image area
1
Reserved
B11
0
No surround sound information
1
Surround sound mode
B12
RESERVED
B13
RESERVED
11.0
μs
W0
W1 W2
W3 W4
W5 W6
W7
W8 W9 W10 W11 W12 W13
500mV
RUN-IN
SEQUENCE
START
CODE
ACTIVE
VIDEO
38.4
μs
42.5
μs
00221-058
Figure 58. WSS Waveform Diagram
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