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ADV7321 Datasheet(PDF) 68 Page - Analog Devices |
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ADV7321 Datasheet(HTML) 68 Page - Analog Devices |
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68 / 88 page  ADV7320/ADV7321 Rev. 0 | 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 of these bits 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 s 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 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 11.0 µs 38.4 µs 42.5 µs W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12 W13 Figure 97. WSS Waveform Diagram |
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