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TVP5151: Which Pin or register indicates Video Input exist?

Part Number: TVP5151

Hi, 

I have a design with TVP5151IPBSR with miscellaneous controls register set to 00001001.

Analog Side is connected to PAL video

Digital Side is connected to DSP.

Which Signal or register May indicate I have a valid video input?

What happens if no Anlog Video exist? do i still get Hsync/Vsync?

What value does output frames contain when there is no video in the input?

Best Regards

Eyal