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BQ76PL536: 536 doesn't response to host

Part Number: BQ76PL536

Hello,

      In my application, only one BQ76PL536 is connected to DSP28035, so it works as device to host mode.

      I didn't change the address for BQ76PL536, so the address is 0, and the clock frequency was 250kHz.

      I capture the SPI waveform and found that BQ76PL536 doesn't response any host's command:

      For example, the waveform below shows the read IO register operation, the data is 0x00, 0x31, 0x01, 0x55(dumy write to keep CS and clock for 536 response 1 byte )

1: MOSI  2:CS  3: Clock 4: MISO

      

Any special setting to enable device to host mode?