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Article Can FORCE_VIDEO be used to generate a test pattern on the MAX9281?

The FORCE_VIDEO bit in register 0x95 is a way to mask video coming into the serializer with some known value, i.e. a blue screen.  You need valid sync signals (HS, VS, DE) and PCLK in order for the serializer to send video data specified by DFORCE in registers 0x9D-0x9F.  So, you can generate a solid color with the DFORCE bits, but that color will only be transmitted when PCLK and valid sync signals are present.
 

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