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DS90UB941AS-Q1: Configure I2C pass through between 941 and 948

Part Number: DS90UB941AS-Q1

Hi team,

In order to make I2C pass through between 941 and 948, which means that I2C signal can pass from 941 input to 948 output, which register do I need to setup?

Beside 0x03/0x17/0x70, are there another register I need to configure?

When my customer use the following code, I2C can't pass through between 941 and 948.... 

  if(ds90u941_write_reg(client,0x03, 0x08)<0) //I2C Pass-Through enable Port 0

  if(ds90u941_write_reg(client,0x17, 0x80)<0) //I2C_PASS_ALL

  if(ds90u941_write_reg(client,0x70, 0x1a<<1)<0) //7-bit Remote Slave Device ID 1 this 1a is touch IC address

Thanks!