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Re: Less lines in ADV7180 free run mode NTSC embedded sync capture

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Dear Dave,

 

I have following observations regarding NTSC capture:

1. In case Extended output control register (0x04 bit [7]) is set to 1 (ITU-R BT.656-4 compatible) then ADV7180 behaves as follows:

     a. When NTSC source is connected - The size of each field is (720 X 243) or (720 X 244).

     b. When in free-run mode (previously NTSC source connected) - The size of each field is (720 X 233) or (720 X 234).

 

2. In case Extended output control register (0x04 bit [7]) is set to 0 (ITU-R BT.656-3 compatible) then ADV7180 behaves as follows:

     a. When NTSC source is connected - The size of each field is (720 X 243) or (720 X 244).

     b. When in free-run mode (previously NTSC source connected) - The size of each field is (720 X 243) or (720 X 244).

 

Why ADV7180 is behaving differently when video source is connected and in free-run mode when set in ITU-R BT.656-4 compatible mode?

 

Thanks and Regards,

Varun


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