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ADV7342 数据表(PDF) 75 Page - Analog Devices |
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ADV7342 数据表(HTML) 75 Page - Analog Devices |
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75 / 88 page ![]() ADV7342/ADV7343 Rev. 0 | Page 75 of 88 APPENDIX 5—SD TIMING Mode 0 (CCIR-656)—Slave Option (Subaddress 0x8A = X X X X X 0 0 0) The ADV7342/ADV7343 are controlled by the SAV (start of active video) and EAV (end of active video) time codes embedded in the pixel data. All timing information is transmitted using a 4-byte synchronization pattern. A synchronization pattern is sent immediately before and after each line during active picture and retrace. If the S_VSYNC and S_HSYNC pins are not used, they should be tied high during this mode. Y Cr Y F F 0 0 0 0 X Y 8 0 1 0 8 0 1 0 F F 0 0 F F A B A B A B 8 0 1 0 8 0 1 0 F F 0 0 0 0 X Y C b Y C r C b Y C b Y C r EAV CODE SAV CODE ANCILLARY DATA (HANC) 4 CLOCK 4 CLOCK 268 CLOCK 1440 CLOCK 4 CLOCK 4 CLOCK 280 CLOCK 1440 CLOCK END OF ACTIVE VIDEO LINE START OF ACTIVE VIDEO LINE ANALOG VIDEO INPUT PIXELS NTSC/PAL M SYSTEM (525 LINES/60Hz) PAL SYSTEM (625 LINES/50Hz) Y Figure 100. SD Slave Mode 0 Mode 0 (CCIR-656)—Master Option (Subaddress 0x8A = X X X X X 0 0 1) The ADV7342/ADV7343 generate H and F signals required for the SAV and EAV time codes in the CCIR656 standard. The H bit is output on S_HSYNC and the F bit is output on S_VSYNC. 522 523 524 525 8 9 10 11 20 21 22 DISPLAY DISPLAY VERTICAL BLANK ODD FIELD EVEN FIELD H F 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 283 284 285 ODD FIELD EVEN FIELD DISPLAY DISPLAY VERTICAL BLANK H F 7 6 5 4 3 2 1 Figure 101. SD Master Mode 0, NTSC |
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