SPI0 external RAM DDR read command control register
SPI_MEM_CACHE_SRAM_USR_RD_CMD_VALUE | For SPI0,When cache mode is enable it is the read command value of command phase for sram. |
SPI_MEM_CACHE_SRAM_USR_RD_CMD_BITLEN | For SPI0,When cache mode is enable it is the length in bits of command phase for sram. The register value shall be (bit_num-1). |