I plan on using the ADV7612 but only need one input. Should I ground the unused inputs or let them float. The 7611 does not offer the 20 bit pixel I/F?
Appendix B in the hardware guide has unused pin recommendations. You generally float unused TMDS pins, check the appendix for the others.
ADV7611 has a 24 bit pixel bus. If by 20-bit you mean 10-bit YCbCr 4:2:2 then yes.. it can do that. What it can't do is 10-bit 4:4:4 RGB/YCbCr.
Just to clarify..I do want to use 422 YCbCr and prefer 20 bit over 10 ..are you saying the 7611 will support this? I must be missing something as it is clearly specified in the 7612 data sheet but not the 7611? From the 7612 I want mode 0 with op sel set to 0x81 (table6)
There is no such thing as 20-bit per sample in HDMI. That would be a 40-pin output bus. It's 8-bit/10-bit/12-bit. So to clarify-- are you asking about 10-bit YCbCr 4:2:2 which means 10-bits for Y and 10-bits for Cb/Cr leading to a need for a 20-bit output bus?
I'm pretty sure this is not a problem with ADV7611 but I'm checking to be certain since I also see no mention of it in the docs.
Yes that is what I mean. 10 bit video on a 20 bit bus. I like 20 bit for the slower speed especially at 1080p.
I was wrong-- you'll have to use ADV7612 for 10-bit. For YCbCr 4:2:2-- you *can* use 12-bit (or 8-bit) but not 10-bit.
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