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DRV8353: SDO always output 0xff

Part Number: DRV8353

Hi Team,

The customer use DRV8353RS in motor control system,  trying to read from address 04h, but the output from MISO is always 0xffff,  vbuck is OK, output signals also OK. They use 4 GPIOs to connect to DRV8353 SPI pins, trying to control DRV8353 by SPI interface, but SDO always output 0xff, could you please help to check is there any problem in schemetic and final signal?

For the first waveform, yellow is nSCS, blue is clock.
For the second waveform, yellow is clock and blue is MOSI
There is no need for the third waveform because MISO is always high.

Could you help check this case? Thanks.

Best Regards,

Cherry