Question
When I use the AD9882, it can automatically decrypt the incoming HDCP signal.
Also, this chip can process the normal non-HDCP signal too. Just a quick
question, how can I know whether the incoming signal is HDCP or not for AD9882.
How can I use i2c register to read those information.
Answer
for the AD9882 and can tell you that there is an external pin on the AD9882
which indicates if there is HDCP content - and that is the CTL3 pin (pin 25).
This CTL3 signal has been assigned to HDCP encoded data.
If you are designing a repeater using the AD9882, this will only work with a
non-HDCP signal as the HDCP transmitter must know of all the 'down-stream' Rx
devices and their keys. As far was we know, it is not possible to perform the
data collection and manipulation necessary for a valid DVI-HDCP repeater using
a receiver (such as the AD9882) which is not repeater enabled. If you wish to
re-transmit non-HDCP encoded data, that is permissible.