ADV7172 datasheet(45/59 Pages) AD

Part #	ADV7172

Description	Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management

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ADV7172/ADV7173

–45–

REV. A

APPENDIX 4

WIDE SCREEN SIGNALING

The ADV7172/ADV7173 supports Wide Screen Signaling (WSS) conforming to the standard. WSS data is transmitted on Line 23.

WSS data can only be transmitted when the ADV7172/ADV7173 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 71).

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

B0 B1 B2 B3

Aspect Ratio

Format

Position

0001

4:3

Full Format

Nonapplicable

1000

14:9

Letterbox

Center

0100

14:9

Letterbox

Top

1101

16:9

Letterbox

Center

0010

16:9

Letterbox

Top

1011

>16:9

Letterbox

Center

0111

14:9

Full Format

Center

1110

16:9

Nonapplicable

11.0 s

W0

W1 W2

W3 W4

W5

W6 W7

W8 W9 W10 W11 W12 W13

500mV

RUN-IN

SEQUENCE

START

CODE

ACTIVE

VIDEO

38.4 s

42.5 s

Figure 71. WSS Waveform Diagram

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

No Open Subtitles

1

0

Subtitles In Active Image Area

0

1

Subtitles Out of Active Image Area

1

Reserved

B11

0

No Surround Sound Information

1

Surround Sound Mode

B12

RESERVED

B13

RESERVED

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