DRV8244S-Q1LEVM: SPI communication data read and write

Hi Team,

When writing data to the drive chip DRV8244S, pull NSCs low first, then SDI writes A1 and D1 data, where A1 contains the read/write flag bits, the data address, and D1 is the data to be written.

When reading data from the driver DRV8244S, pull NSCs low first, then SDI writes A1 and D1 data, where A1 contains the read/write flag, data address, and D1 is null and has no effect. Then read the data S1, R1 above SDO, where S1 is the fault condition and R1 is the data value to read the corresponding address. 

Are the above understanding correct? Or could you help tell what's the correct process? Thanks.