I am using ADV7611 for HDMI source chip , I met a problem , most kind of HDMI source device can be recognized correctly such as Gopro camara and HDMI hub , but when I use STB box , adv7611 can't output right waveform , I tried to read register , and found HDMI/DVI status bit ( 0x68 0x06) is 0 ,which means its DVI source? other register such as clock detect , pll lock is right.
I use oscilloscope to test the DDCL signal , found there is only few signals when I plug into the cable ,then there is nothing but hign level input . for comparing , I test the right source and found there is always DDCL signal after I plug the cable.
Hope for your reply , thanks a lot.