i'm a german student and developing a Video Converter with the ADV7611 iC. I'm trying to set up the registers via I2C Interface from an AtMEGA-328p. After the reset (0x98,0xFF,0x80) a few register could be setting up (I/O MAP) then the ADV doesn't acknowledge the addresses sending...
Could it be a timing problem? The uC runs at 8Mhz, the I2C at 100kHz there are about 12uS between Stop- and Start Conditions. Sometimes a few register from the HDMI-MAP (0x68) are acknowledged so i would say the ADV accepts the addresses recommended in the datasheet.
Here is a picture from the Logic Analyzer: