DRV8353R: Reading Don't Care Bits for additional diagnostic

Hi BLDC Team, 

I would have a question regarding the SPI  communication of DRV8353RS. Are the Don't Care Bits ( B15-B11) of the SDO output Data word  always 0 when reading and could this be used as an additional  diagnostic e.g. to ensure that you are actually receiving feedback when reading the status registers? 

Thanks and best regards, 

Angelika