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DS90UB929 - Using the I2C Interface for SPI

Hello,

I need to pass SPI to a remote device on the other end of my SerDes; I am using the DS90UB929 and the DS90UB926Q. I have a 3-wire SPI with SDA and SCL connected to the respective SDA and SCL of the serializer. The chip-select is connected to a GPIO. Will the SerDes pass the SPI data, or will it reject the communication with a NAK?

Our controller is bit-banging SPI, so that gives us some flexibility.