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ADV7174 Datasheet(PDF) 43 Page - Analog Devices

Part # ADV7174
Description  Chip Scale PAL/NTSC Video Encoder with Advanced Power Management
PDF  52 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADV7174 Datasheet(HTML) 43 Page - Analog Devices

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ADV7174/ADV7179
Rev. A | Page 43 of 52
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
B0
B1
B2
B3
Aspect
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
Applicable
Not
Applicable
Table 23. Bit 4–Bit 7
Bit
Value
Description
B4
0
1
Camera Mode
Film Mode
B5
0
1
Standard Coding
Motion Adaptive Color Plus
B6
0
1
No Helper
Modulated Helper
B7
Reserved
B8
0
1
No Teletext Subtitles
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
1
No Surround Sound Information
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
Figure 58. WSS Waveform Diagram



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