Sdio Data Control Register (Sdio_Dctrl) - STMicroelectronics STM32F405 Reference Manual

Secure digital input/output interface (SDIO)
31.9.9

SDIO data control register (SDIO_DCTRL)

Address offset: 0x2C
Reset value: 0x0000 0000
The SDIO_DCTRL register control the data path state machine (DPSM).
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
Bits 31:12 Reserved, must be kept at reset value
Bit 11 SDIOEN: SD I/O enable functions
Bit 10 RWMOD: Read wait mode
Bit 9 RWSTOP: Read wait stop
Bit 8 RWSTART: Read wait start
Bits 7:4 DBLOCKSIZE: Data block size
Define the data block length when the block data transfer mode is selected:
Bit 3 DMAEN: DMA enable bit
1058/1731
Reserved
If this bit is set, the DPSM performs an SD I/O-card-specific operation.
0: Read Wait control stopping SDIO_D2
1: Read Wait control using SDIO_CK
0: Read wait in progress if RWSTART bit is set
1: Enable for read wait stop if RWSTART bit is set
If this bit is set, read wait operation starts.
0000: (0 decimal) lock length = 2
0001: (1 decimal) lock length = 2
0010: (2 decimal) lock length = 2
0011: (3 decimal) lock length = 2
0100: (4 decimal) lock length = 2
0101: (5 decimal) lock length = 2
0110: (6 decimal) lock length = 2
0111: (7 decimal) lock length = 2
1000: (8 decimal) lock length = 2
1001: (9 decimal) lock length = 2
1010: (10 decimal) lock length = 2
1011: (11 decimal) lock length = 2
1100: (12 decimal) lock length = 2
1101: (13 decimal) lock length = 2
1110: (14 decimal) lock length = 2
1111: (15 decimal) reserved
0: DMA disabled.
1: DMA enabled.
DocID018909 Rev 11
rw rw rw rw rw rw rw rw rw rw rw rw
0
= 1 byte
1
= 2 bytes
2
= 4 bytes
3
= 8 bytes
4
= 16 bytes
5
= 32 bytes
6
= 64 bytes
7
= 128 bytes
8
= 256 bytes
9
= 512 bytes
10
= 1024 bytes
11
= 2048 bytes
12
= 4096 bytes
13
= 8192 bytes
14
= 16384 bytes
9 8 7 6 5 4 3
DBLOCKSIZE
RM0090
2 1 0