Samsung S3C2440A - Manual (Page 444)

MMC/SD/SDIO CONTROLLER S3C2440A RISC MICROPROCESSOR
19-8
SDI Data Control Register(SDIDatCon)
Register Address R/W Description Reset Value
SDIDatCon 0x5A00002C R/W SDI Data control Register 0x0
SDIDatCon Bit Description Initial Value
Reserved [31:25]
Burst4 enable
(Burst4)
[24] Enable Burst4 mode in DMA mode. This bit should be set only
when Data Size is word.
0 = disable, 1 = Burst4 enable
0
Data Size
(DataSize)
[23:22] Indicates the size of the transfer with FIFO, which is typically byte,
halfword or word.
00 = Byte transfer, 01 = Halfword transfer
10 = Word transfer, 11 = reserved
0
SDIO Interrupt
Period Type
(PrdType)
[21] Determines whether SDIO Interrupt period is 2 cycle or extend
more cycle when data block last is transferred (for SDIO).
0 = exactly 2 cycle, 1 = more cycle(likely single block)
0
Transmit After
Response
(TARSP)
[20] Determines when data transmit start after response receive or not
0 = directly after DatMode set,
1 = after response receive(assume DatMode sets to 2’b11)
0
Receive After
Command
(RACMD)
[19] Determines when data receive start after command sent or not
0 = directly after DatMode set,
1 = after command sent (assume DatMode sets to 2’b10)
0
Busy After
Command
(BACMD)
[18] Determines when busy receive start after command sent or not
0 = directly after DatMode set,
1 = after command sent (assume DatMode sets to 2’b01)
0
Block mode
(BlkMode)
[17] Data transfer mode
0 = stream data transfer, 1 = block data transfer
0
Wide bus enable
(WideBus)
[16] Determines enable wide bus mode
0 = standard bus mode(only SDIDAT[0] used),
1 = wide bus mode(SDIDAT[3:0] used)
0
DMA Enable
(EnDMA)
[15] Enable DMA
0 = disable(polling), 1 = dma enable
When DMA operation is completed, this bit should be disabled.
0
Data Transfer
Start(DTST)
[14] Determines whether data transfer start or not. . This bit is auto-
matically cleared.
0 = data ready, 1 = data start
0
Data Transfer
Mode (DatMode)
[13:12] Determines which direction of data transfer
00 = no operation, 01 = only busy check mode
10 = data receive mode, 11 = data transmit mode
00
BlkNum [11:0] Block Number(0~4095), don’t care when stream mode 0x000
* If you want one of TARSP, RACMD, BACMD bits(SDIDatCon[20:18]) to “1”, you need to write on SDIDatCon
register ahead of on SDICmdCon register.(always need for SDIO)