Datasheet

ADV7320/ADV7321
Rev. A | Page 68 of 88
APPENDIX 2—SD WIDE SCREEN SIGNALING
[Subaddresses 0x59, 0x5A, 0x5B]
The ADV7320/ADV7321 support wide screen signaling (WSS)
conforming to the ETS 300 294 standard. WSS data is transmitted
on Line 23. WSS data can be transmitted only when the device
is configured in PAL mode. The WSS data is 14 bits long, and
the function of each bit is shown in
Table 40. The WSS data is
preceded by a run-in sequence and a start code (see
Figure 97).
If SD WSS [Address 0x59, Bit 7] is set to Logic 1, it enables the
WSS data to be transmitted on Line 23. The latter portion of
Line 23 (42.5 sec after the falling edge of
HSYNC
) is available
for the insertion of video. It is possible to blank the WSS
portion of Line 23 with Subaddress 0x61, Bit 7.
Table 40. Function of WSS Bits
Bit Description
Bit 0 to Bit 2 Aspect ratio/format/position
Bit 3 Odd parity check of Bit 0 to Bit 2
B0 B1 B2 B3 Aspect Ratio Format Position
0 0 0 1 4:3 Full format N/A
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 N/A N/A
1 1 1 0 16:9
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
ACTIVE
VIDEO
RUN-IN
SEQUENCE
START
CODE
500mV
11.0μs
38.4μs
42.5μs
W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12 W13
05067-097
Figure 97. WSS Waveform Diagram