Samsung S3C2440A - Manual (Page 437)

S3C2440A RISC MICROPROCESSOR MMC/SD/SDIO CONTROLLER
19-1
19
MMC/SD/SDIO Controller
FEATURES
SD Memory Card Spec(ver 1.0) / MMC Spec(2.11) compatible
SDIO Card Spec(Ver 1.0) compatible
16 words(64 bytes) FIFO for data Tx/Rx
40-bit Command Register
136-bit Response Register
8-bit Prescaler logic(Freq = System Clock / (P + 1))
Normal, and DMA data transfer mode(byte, halfword, word transfer)
DMA burst4 access support(only word transfer)
1bit / 4bit(wide bus) mode & block / stream mode switch support
BLOCK DIAGRAM
CMD Reg
(5byte)
Resp Reg
(17byte)
CMD Control
8bit Shift Reg
CRC7
Prescaler
FIFO
(64byte)
DAT Control
8bit Shift Reg
CRC16*4
DMA
INT
APB
I/F
8
8
8
8
32
32
32
32
32
32
PADDR
PSEL
PCLK
PWDATA
[31:0]
PRDATA
[31:0]
DREQ
DACK
INT
TxCMD
RxCMD
SDCLK
TxDAT[3:0]
RxDAT[3:0]
Figure 19-1. SD Interface block diagram