STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and ...

Secure digital input/output interface (SDIO)
RM0008
argument can vary according to the type of response: the software will distinguish the type
of response according to the sent command. CE-ATA devices send only short responses.
20.9.5 SDIO command response register (SDIO_RESPCMD)
Address offset: 0x10
Reset value: 0x0000 0000
The SDIO_RESPCMD register contains the command index field of the last command
response received. If the command response transmission does not contain the command
index field (long or OCR response), the RESPCMD field is unknown, although it must
contain 111111b (the value of the reserved field from the response).
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
RESPCMD
Reserved
r r r r r r
Bits 31:6 Reserved, always read as 0.
Bits 5:0 RESPCMD: Response command index
Read-only bit field. Contains the command index of the last command response received.
20.9.6 SDIO response 1..4 register (SDIO_RESPx)
Address offset: (0x10 + (4 × x)); x = 1..4
Reset value: 0x0000 0000
The SDIO_RESP1/2/3/4 registers contain the status of a card, which is part of the received
response.
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
CARDSTATUSx
r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r r
Bits 31:0 CARDSTATUSx: see Table 150.
The Card Status size is 32 or 127 bits, depending on the response type.
Table 150. Response type and SDIO_RESPx registers
Register Short response Long response
SDIO_RESP1 Card Status[31:0] Card Status [127:96]
SDIO_RESP2 Unused Card Status [95:64]
SDIO_RESP3 Unused Card Status [63:32]
SDIO_RESP4 Unused Card Status [31:1]0b
The most significant bit of the card status is received first. The SDIO_RESP3 register LSB is
always 0b.
500/995 Doc ID 13902 Rev 9