
S3C2440A RISC MICROPROCESSOR
MMC/SD/SDIO CONTROLLER
19-9
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
NOTE:
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)