Hello,
I added some comments to the questions so that I would be more understandable for you. Would you please reply yo me ASAP since my customer has been waiting for a long time?
My customer uses UH927 and UH928 and has 2 issues right now and I have a couple of questions which are related to the tickets from our disty FAE.
http://e2e.ti.com/support/interface/high_speed_interface/f/138/t/375714.aspx
http://e2e.ti.com/support/interface/high_speed_interface/f/138/t/375719.aspx
The first issue is that my customer sees blue screen when the input source changes from HDCP digital to no HDCP analog. Their current system is that starting without HDCP(when it isn't a HDCP content), authenticating when HCDP content is connected and keeping protecting contents if the input source changes to analog. However if the source changes to analog like AUX input, they see IS_AUTH_FAIL=1 with blue screen.
Boot
-> No HDCP authentication (unless HDCP is required)
-> HDCP authentication when the source changes to HDCP
-> Continues protecting source if it is analog like AUX input
-> IS_AUTH_FAIL=1with blue screen
The other issue is KSV RDY bit in HDCP_STS register. They need to wait for around 5ms or so to get the correct KSV RDY bit when the interrupt is asserted. They don't need wait time for the other interrupt status bit.
Questions
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1. Does my customer need to perform authentication again if the input source changes even if it is analog? Would you please tell me the correct procedure for HDCP? I mean in which case, the authetication has to be performed and doesn't have to be done?
2. Is KSV RDY bit required a wait time unlike the other bits? If so, how long will it be? Do you see any issues on checking the interrupt status?