DRV8334-Q1: Gate driver status fault occurred

Tool/software:

1) Fault occurrence in SPI communication
2) FAULT bit 1, SDO B31bit 1 of IC_STAT1 register (0x00h) when reading status register
3) No flag occurred when reading other status registers
4) The bit corresponding to Reserved in IC_STAT6 is set to 1

Q. Why is the reserved bit set to 1?  Please tell me how to solve this.

MCU : TMS320F2800156-Q1

MCU SPI option