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DS92LX1621: Forward channel working, but I2C control of deserialize not working

Part Number: DS92LX1621


We have a display configuration, both sides have CAD set to 0V. 

All of the forward data is working and the display lights up, and we can address the Serializer at address x58. We can read and write to the Serializer registers.

However, we can not detect the Deserializer at address x60, nor can we detect any other address on the bus. (All NAK except x58)

We have set the slave ID, and tried that, but no activity is detected at the I2C on the Deserializer.

Here are the registers at the Serializer 

b0 00 20 f1 80 40 c0 48 00 01 00 00 05 13 03 03
03 03 03 00

M/S on the Serializer  is 3.3V and on the Deserializer  0V