Sdio Data Control Register (Sdio_Dctrl) - ST STM32F101 series Reference Manual

Secure digital input/output interface (SDIO)
22.9.9

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
If this bit is set, the DPSM performs an SD I/O-card-specific operation.
Bit 10 RWMOD: Read wait mode
0: Read Wait control stopping SDIO_D2
1: Read Wait control using SDIO_CK
Bit 9 RWSTOP: Read wait stop
0: Read wait in progress if RWSTART bit is set
1: Enable for read wait stop if RWSTART bit is set
Bit 8 RWSTART: Read wait start
If this bit is set, read wait operation starts.
Bits 7:4 DBLOCKSIZE: Data block size
Define the data block length when the block data transfer mode is selected:
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
Bit 3 DMAEN: DMA enable bit
0: DMA disabled.
1: DMA enabled.
603/1128
Reserved
7
DocID13902 Rev 15
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
= 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
RM0008
2 1 0