| USR_SRAM_DIO | For SPI0 In the spi sram mode spi dual I/O mode enable 1: enable 0:disable |
| USR_SRAM_QIO | For SPI0 In the spi sram mode spi quad I/O mode enable 1: enable 0:disable |
| USR_WR_SRAM_DUMMY | For SPI0 In the spi sram mode it is the enable bit of dummy phase for write operations. |
| USR_RD_SRAM_DUMMY | For SPI0 In the spi sram mode it is the enable bit of dummy phase for read operations. |
| CACHE_SRAM_USR_RCMD | For SPI0 In the spi sram mode cache read sram for user define command. |
| SRAM_BYTES_LEN | For SPI0 In the sram mode it is the byte length of spi read sram data. |
| SRAM_DUMMY_CYCLELEN | For SPI0 In the sram mode it is the length in bits of address phase. The register value shall be (bit_num-1). |
| SRAM_ADDR_BITLEN | For SPI0 In the sram mode it is the length in bits of address phase. The register value shall be (bit_num-1). |
| CACHE_SRAM_USR_WCMD | For SPI0 In the spi sram mode cache write sram for user define command |