Secure digital input/output interface (SDIO)
RM0008
20.9.15
SDIO data FIFO register (SDIO_FIFO)
Address offset: 0x80
Reset value: 0x0000 0000
The receive and transmit FIFOs can be read or written as 32-bit wide registers. The FIFOs
contain 32 entries on 32 sequential addresses. This allows the CPU to use its load and store
multiple operands to read from/write to the FIFO.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
FIF0Data
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
bits 31:0 FIFOData: Receive and transmit FIFO data
The FIFO data occupies 32 entries of 32-bit words, from address:
SDIO base + 0x080 to SDIO base + 0xFC.
20.9.16
SDIO register map
The following table summarizes the SDIO registers.
Table 151. SDIO register map
Offset
0x00
0x04
Register
SDIO_POWER
SDIO_CLKCR
0x08
0x0C
SDIO_ARG
SDIO_CMD
CMDARG
0x10
0x14
0x18
0x1C
0x20
0x24
SDIO_RESPCM
D
SDIO_RESP1
SDIO_RESP2
SDIO_RESP3
SDIO_RESP4
SDIO_DTIMER
Reserved
CARDSTATUS1
CARDSTATUS2
CARDSTATUS3
CARDSTATUS4
DATATIME
RESPCMD
0x28
0x2C
0x30
SDIO_DLEN
SDIO_DCTRL
SDIO_DCOUNT
Reserved
Reserved
DATALENGTH
DATACOUNT
0x34
510/995
SDIO_STA
Doc ID 13902 Rev 9
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