ADV7170SU AD [Analog Devices], ADV7170SU Datasheet - Page 34

• Manufacturer Part Number: ADV7170SU
• Manufacturer: AD [Analog Devices]

ADV7170/ADV7171
The ADV7170/ADV7171 supports Wide Screen Signalling (WSS) conforming to the standard. WSS data is transmitted on Line 23.
WSS data can only be transmitted when the ADV7170/ADV7171 is 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 the bit C/W07 is set to a Logic “1” it enables the WSS data to transmitted on Line 23. The latter portion of Line
23 (42.5 s from the falling edge of HSYNC) is available for the insertion of video.
Function of CGMS Bits
Bit 0–Bit 2
Bit 3 is odd parity check of Bit 0–Bit 2
B0 B1 B2 B3
0
1
0
1
0
1
0
1
B4
0
1
B5
0
1
B6
0
1
B7
500mV
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
0
0
1
0
1
1
0
Camera Mode
Film Mode
Standard Coding
Motion Adaptive Color Plus
No Helper
Modulated Helper
RESERVED
11.0 s
Aspect Ratio
4:3
14:9
14:9
16:9
16:9
>16:9
14:9
16:9
Aspect Ratio/Format/Position
SEQUENCE
RUN-IN
Full Format
Letterbox
Full Format
Format
Letterbox
Letterbox
Letterbox
Letterbox
Nonapplicable Nonapplicable
START
CODE
Figure 58. WSS Waveform Diagram
WIDE SCREEN SIGNALING
38.4 s
42.5 s
W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12 W13
Center
Top
Center
Top
Center
Position
Nonapplicable
Center
APPENDIX 4
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B9
0
1
0
1
B11
0
1
B12
B13
B10
0
0
1
1
No Open Subtitles
Subtitles In Active Image Area
Subtitles Out of Active Image Area
Reserved
No Surround Sound Information
Surround Sound Mode
RESERVED
RESERVED
ACTIVE
VIDEO
REV. 0