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ADV7612 12-bit 1080p input

Question asked by jl.qc on Nov 29, 2011
Latest reply on Dec 1, 2011 by mattp

On the 7612, I’m having some problems with 12-bit 1080p input signals.  The TTL output seems to become unstable and even the HDMI measurement registers are changing values.  I don’t notice this issue on lower resolutions or for 8 or 10 bit inputs.  On some other ADI receivers, I remember there used to be some bits that needed to be set for higher bandwidth modes, but I couldn’t find anything in the 7612 register spec.

 

The only register I found was IO 0x14[4:3] for DR_STR_CLK, which I set to 11b (for pixel clock > 100MHz).

 

Are there other registers that I'm missing?

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