AnsweredAssumed Answered

ADV7850 Output HDCP

Question asked by Anthony on Sep 19, 2014
Latest reply on Sep 27, 2014 by GuenterL

Hi All,


I have encountered a really strange problem with ADV7850.


There is no picture when I use nonHdcp monitor and the the output signal is DVI, EXT_HDMI_MODE is set to 0, and the HDCP_ENABLE (AF[7]) set to 1. When I set the output to HDMI mode the picture appears again. With Hdcp capable monitor everything is working fine.


The only difference that I found the DDC communication on the output port. When the output mode is HDMI the ADV7850 tries the HDCP authentication more often than when the output mode is DVI. In the first case cycle is approximately 1 ms and in the second case the cycle is approximately 240 ms.


I tried to use ADV7850 eval board and everything was the same.


Does anybody encountered with this problem?

Any help would be appreciated.


Best regards,

Antal Bánovics.