TMS320F28335: How to determine the parameters of SPI input block in PSIM to interface SSI position encoder?

Hello,

I am using SPI pins of F28335 DSP to read SSI output of the encoder. For this purpose, I am using transceiver IC to interface the differential output signals of the SSI encoder (Clock signal and data signal) and the SPI pins of the DSP. The used encoder does not have incremental tracks. My question is how to determine the parameters of the SPI input block in PSIM; especially, start initial command value, received data command, data bit position, SPI initial command value.

 Thanks for your support.