ST STM32F412

RM0402 Rev 6 919/1163
RM0402 Secure digital input/output interface (SDIO)
921
27.8.15 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
Res. Res. Res. Res. Res. Res. Res. Res. FIFOCOUNT[23:16]
rrrrrrrr
1514131211109876543210
FIFOCOUNT[15:0]
rrrrrrrrrrrrrrrr
Bits 31:24 Reserved, must be kept at reset value.
Bits 23:0 FIFOCOUNT: Remaining number of words to be written to or read from the FIFO.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIF0Data[31:16]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
FIF0Data[15:0]
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.