We are using the AD9389b, to send HDCP encrypted signals to a TV.
We initialize the AD9389 according to your procedure described in AN-810 "EDID und HDCP users guide:
1. Initialy, the HPD is low.
2. After HPD went high, we can see that the AD9889 reads EDID segment 0 and sends an EDID Ready interrupt to the system.
3. We set HDCP Desired bit (0xAF) high.
4. After writing a one to bit 7 of Register 0xAF an HDCP Error Interrupt is issued and the "HDCP Controller Error register" (0xC8 [7:4]). indicates "RI Missmatch" (0b0010). Note: There is no Key reading Error 0xb8(4) = 0
What could be the reason why the RI Missmatch error bit is set?
Thanks in advance for your help