Rainbow Electronics W90P710CDG - Manual (Page 238)

W90P710CD/W90P710CDG
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Continued.
BITS DESCRIPTIONS
[3] DMARd
DMA Read Enable
Set this bit high enables the DMA to transfer data from external
SDRAM to internal buffer. This bit will be cleared automatically after
DMA operation finished. Write 0 to this bit has no effect.
1’b0: No DMA operation (Default)
1’b1: Enable DMA read operation
[2] DMAWr
DMA Write Enable
Set this bit high enables the DMA to transfer data from internal buffer
into external SDRAM. This bit will be cleared automatically after DMA
operation finished. Write 0 to this bit has no effect.
1’b0: No DMA operation (Default)
1’b1: Enable DMA write operation
[1]
SWRST
Software Reset
Set this bit high will reset only the logic circuit of SD host controller and
has no effect on all control registers.
1’b0: No operation (Default)
1’b1: Enable software reset
[0] SDEN
SD Function Enable
Set this bit high enables the SD host controller operation. If this bit is
cleared, all operations are disabled and SD host controller only
responses to control register access.
1’b0: Disable SD host controller (Default)
1’b1: Enable SD host controller