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ADV7842 and ADV7511 Aspect Ratio

Question asked by raymondcarter Employee on Oct 31, 2013
Latest reply on Nov 6, 2013 by chickenfeet

We want to detect aspect ratio (4:3 and 16:9) in the 7842 for analog 480/576 video. We can select aspect ratios of 4:3 and 16:9 from our video sources, but I haven’t been able to detect aspect ratio changes in the 7842. The Hardware Manual discusses Wide Screen Signaling and CGMS, but I don’t have the bit definitions (I don’t have the WSS Standard) and I’m not sure I have the 7842 set up correctly for detection.

 

I looked at the ADI scripts and I don’t see anything for analog aspect ratio. It looks like they always set up the 7511 for 4:3. We also tried the 7842/7511 Eval Board and it looks like it always transmits 4:3 for analog.

 

Do you have information on how to set up and detect (Picture) Aspect Ratio for analog input to the 7842?

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