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ADV7174BCP-REEL View Datasheet(PDF) - Analog Devices

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ADV7174BCP-REEL Datasheet PDF : 52 Pages
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ADV7174/ADV7179
APPENDIX 4—WIDE SCREEN SIGNALING (WSS)
The ADV7174/ADV7179 supports WSS, conforming to the
standard. WSS data is transmitted on Line 23. WSS data can
only be transmitted when the ADV7174/ ADV7179 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 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 WSS BITS
Table 22. Bit 0–Bit 2 Bit 3 is the odd parity check of Bit 0–Bit 2
Aspect
B0 B1 B2 B3 Ratio Format
Position
0 0 0 1 4:3
Full
Format
Not
Applicable
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
Not
Not
Applicable Applicable
Table 23. Bit 4–Bit 7
Bit
Value Description
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
B8
0
No Teletext Subtitles
1
Teletext Subtitles
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
11.0μs
38.4μs
42.5μs
Figure 58. WSS Waveform Diagram
Rev. B | Page 43 of 52
 

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