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MISO is always high

Other Parts Discussed in Thread: CC1200

Hi All

my platform is CC1200+DK-TM4C129X,

 MRFI_SPI_DRIVE_CSN_LOW();
  Mrfi_DelayUsec(10);
  MRFI_SPI_DRIVE_CSN_HIGH();

  /* hold CSn high for at least 40 microseconds */
  Mrfi_DelayUsec(40);

  /* pull CSn low and wait for SO to go low */
  MRFI_SPI_DRIVE_CSN_LOW();
  while(MRFI_SPI_SO_IS_HIGH());

when execute this, the MISO pin is always high after the CSN pin change to low, I use the oscilloscope can see the CSN change normally, but  MISO just remain high,

first , I think problem is reset, but I connect the RESET pin to VDD, just have no influence on this problem ,MISO just remian high,