SPI0 external RAM DDR mode control register
| EN | 1: in DDR mode, 0 in SDR mode |
| SPI_SMEM_VAR_DUMMY | Set the bit to enable variable dummy cycle in spi DDR mode. |
| RDAT_SWP | Set the bit to reorder rx data of the word in spi DDR mode. |
| WDAT_SWP | Set the bit to reorder tx data of the word in spi DDR mode. |
| CMD_DIS | the bit is used to disable dual edge in command phase when DDR mode. |
| SPI_SMEM_OUTMINBYTELEN | It is the minimum output data length in the DDR psram. |
| SPI_SMEM_TX_DDR_MSK_EN | Set this bit to mask the first or the last byte in SPI0 ECC DDR write mode, when accesses to external RAM. |
| SPI_SMEM_RX_DDR_MSK_EN | Set this bit to mask the first or the last byte in SPI0 ECC DDR read mode, when accesses to external RAM. |
| SPI_SMEM_USR_DDR_DQS_THD | The delay number of data strobe which from memory based on SPI clock. |
| DQS_LOOP | 1: Do not need the input of SPI_DQS signal, SPI0 starts to receive data when spi0_slv_st is in SPI_MEM_DIN state. It is used when there is no SPI_DQS signal or SPI_DQS signal is not stable. 0: SPI0 starts to store data at the positive and negative edge of SPI_DQS. |
| SPI_SMEM_CLK_DIFF_EN | Set this bit to enable the differential SPI_CLK#. |
| SPI_SMEM_DQS_CA_IN | Set this bit to enable the input of SPI_DQS signal in SPI phases of CMD and ADDR. |
| SPI_SMEM_HYPERBUS_DUMMY_2X | Set this bit to enable the vary dummy function in SPI HyperBus mode, when SPI0 accesses flash or SPI1 accesses flash or sram. |
| SPI_SMEM_CLK_DIFF_INV | Set this bit to invert SPI_DIFF when accesses to external RAM. . |
| SPI_SMEM_OCTA_RAM_ADDR | Set this bit to enable octa_ram address out when accesses to external RAM, which means ADDR_OUT[31:0] = {spi_usr_addr_value[25:4], 6’d0, spi_usr_addr_value[3:1], 1’b0}. |
| SPI_SMEM_HYPERBUS_CA | Set this bit to enable HyperRAM address out when accesses to external RAM, which means ADDR_OUT[31:0] = {spi_usr_addr_value[19:4], 13’d0, spi_usr_addr_value[3:1]}. |