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Stuck bit in adv7612 BSTATUS register

Question asked by Michael.Wilson on Apr 17, 2014
Latest reply on Apr 18, 2014 by Michael.Wilson

This question is regarding the BSTATUS_2 register, offset 0x42 in the Repeater page of the ADV7612.

When I read this register bit 4 is always set.

For example I write 0x02 to the register and read back 0x12, write 0x24 and read back 0x34.

The bit is only set with an HDMI input connected. I have tried an HDMI signal generator, Chromecast, and a Bluray player.

I have verified the same behavior on two boards, so it is not a damaged chip.

 

Per the HDCP spec the field comprised by bits [6:0] of this register are the number of downstream devices & I should be

able to set this to any value from 0x00 to 0x7F.

 

Perhaps this is a known issue? Anyone else seen this?

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