ADV7344 datasheet(72/88 Pages) AD

72 / 88 page

ADV7344

Rev. 0 | Page 72 of 88

APPENDIX 2—SD WIDE SCREEN SIGNALING

Subaddress 0x99, Subaddress 0x9A, Subaddress 0x9B

The ADV7344 supports wide screen signaling (WSS)

conforming to the ETSI 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. The function of each of these bits is shown in Table 55.

The WSS data is preceded by a run-in sequence and a start code

(see Figure 98). If SD WSS (Subaddress 0x99, 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 from 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 0xA1, Bit 7.

Table 55. Function of WSS

Bit Number

Bit Description

Setting

4:3, full format, N/A

14:9, letterbox, center

14:9, letterbox, top

16:9, letterbox, center

16:9, letterbox, top

>16:9, letterbox, center

14:9, full format, center

Aspect Ratio, Format, Position

16:0, N/A, N/A

Camera mode

Mode

Film mode

Normal PAL

Color Encoding

Motion Adaptive ColorPlus

Not present

Helper Signals

Present

Reserved

Teletext Subtitles

Yes

Subtitles in active image area

Subtitles out of active image area

Open Subtitles

Reserved

Surround Sound

Yes

No copyright asserted or unknown

Copying not restricted

Copy Protection

Copying restricted

ACTIVE

VIDEO

RUN-IN

SEQUENCE

START

CODE

500mV

11.0µs

38.4µs

42.5µs

W9 W10 W11 W12 W13

Figure 98. WSS Waveform Diagram

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