ADV7194KSTZ Datasheet, PDF (49/69 Pages) Analog Devices – Professional Extended-10 Video Encoder with 54 MHz Oversampling

APPENDIX 4
WIDE SCREEN SIGNALING
ADV7194
The ADV7194 supports Wide Screen Signalling (WSS) conform-
ing to the standard. WSS data is transmitted on Line 23. WSS
data can only be transmitted when the ADV7194 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 97. 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 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–Bit 2
Aspect Ratio/Format/Position
Bit 3
Is Odd Parity Check of Bit 0–Bit 2
Aspect Format
Position
B0, B1, B2, B3 Ratio Format
Position
0 0 0 1 4:3 Full Format Nonapplicable
1 0 0 0 14:9 Letterbox
Center
0 1 0 0 14:9 Letterbox
Top
1 1 0 1 16:9 Letterbox
Center
0 0 1 0 16:9 Letterbox
Top
1 0 1 1 >16:9 Letterbox
Center
0 1 1 1 14:9 Full Format Center
1 1 1 0 16:9 Nonapplicable 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 0 No Open Subtitles
1 0 Subtitles in Active Image Area
0 1 Subtitles Out of Active Image Area
1 1 RESERVED
B11
0 No Surround Sound Information
1 Surround Sound Mode
B12 RESERVED
B13 RESERVED
500mV
RUN-IN
SEQUENCE
START
CODE
W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12 W13
ACTIVE
VIDEO
11.0␮s
38.4␮s
42.5␮s
Figure 97. WSS Waveform Diagram
REV. A
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