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DS90UH927QEVM: How to use DS90UH927QEVM and pair with DS90UB928Q to access others ICs by I2C

Part Number: DS90UH927QEVM
Other Parts Discussed in Thread: DS90UB928Q

Dear TI team:

I had a trouble to access ICs by I2C.

1. I used TI 927EVM board and paired with DS90UB928Q by FPD-link III cable.

2. Deserializer 928 board has Temperature IC, LED driver IC, EEPROM. and all of them use same I2C channel and I2C channel are connected to Deserializer SDA & SCL(pin 4 & 5).

3. I want to access Temperature IC & LED driver IC & EEPROM in Serializer side.

4. Set Serializer 927 register 0x03 = DAH to enable I2C pass-through.

5. But there is no any response from Serializer or Deserializer.

Above actions, Could TI support me how I can access Deserializer peripheral ICs in Serializer side? or whether do I miss something?

Looking forward to your feedback.