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TUSB4020BPHPEVM: SMBus Access Issue

Part Number: TUSB4020BPHPEVM

I'm using TUSB4020BPHP Evaluation Module, and I try to use a microcontroller to access to TUSB4020BPHPEVM through SMBus.

I connect the SDA and SCL pins on the EEPROM socket of the board to SMBus (with a microcontroller which is Master of SMBus). And I also grounded both TUSB4020BPHPEVM and my Microcontroller.

I use 1000 1110b as a Slave address for TUSB4020BPHPEVM and try to read the registers (0x1 to 0xA), but I couldn't get any data from TUSB4020BPHPEVM.

I can use my Microntroller to read/write a SMBus Slave device, but not TUSB4020BPHPEVM. Am I missing anything?

Any suggestion, advice and inputs will be appreciated!

 - David