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?