Field STATUS_EXT reader - In the slave mode,it is the status for master to read out.
Field STATUS_EXT writer - In the slave mode,it is the status for master to read out.
Field STATUS reader - In the slave mode, it is the status for master to read out.
Field STATUS writer - In the slave mode, it is the status for master to read out.
Field WB_MODE reader - Mode bits in the flash fast read mode, it is combined with spi_fastrd_mode bit.
Field WB_MODE writer - Mode bits in the flash fast read mode, it is combined with spi_fastrd_mode bit.