Hi Yihe:
Since we need to comply with MCTP for rule of address, so we add a address translator (LTC4317CDHC, XOR) on SMBUS.
Here's the topology.

Hardware setting of UCD90320 is 0x33.
On the host side, address of UCD90320 is 0x6C.
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We found UCD90320 can't be found by GPI from host side.
So we want to check with you:
1. If 0x6C is a acceptable address for GUI?
2. For hardware connection, do we need to connect Alert pin to USB-to-GPIO Adapter?