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STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and ...

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Secure digital input/output interface (SDIO)<br />

RM0008<br />

Table 145. R3 response<br />

Bit position Width (bits Value Description<br />

47 1 0 Start bit<br />

46 1 0 Transmission bit<br />

[45:40] 6 ‘111111’ Reserved<br />

[39:8] 32 X OCR register<br />

[7:1] 7 ‘1111111’ Reserved<br />

0 1 1 End bit<br />

20.5.5 R4 (Fast I/O)<br />

Code length: 48 bits. The argument field contains the RCA of the addressed card, the<br />

register address to be read out or written to, <strong>and</strong> its content.<br />

Table 146.<br />

R4 response<br />

Bit position Width (bits Value Description<br />

47 1 0 Start bit<br />

46 1 0 Transmission bit<br />

[45:40] 6 ‘111111’ Reserved<br />

[39:8] Argument field<br />

[31:16] 16 X RCA<br />

[15:8] 8 X register address<br />

[7:0] 8 X read register contents<br />

[7:1] 7 ‘1111111’ CRC7<br />

0 1 1 End bit<br />

20.5.6 R4b<br />

For SD I/O only: an SDIO card receiving the CMD5 will respond with a unique SDIO<br />

response R4. The format is:<br />

Table 147.<br />

R4b response<br />

Bit position Width (bits Value Description<br />

47 1 0 Start bit<br />

46 1 0 Transmission bit<br />

[45:40] 6 x Reserved<br />

39 16 X Card is ready<br />

[38:36] 3 X Number of I/O functions<br />

[39:8] Argument field<br />

35 1 X Present memory<br />

[34:32] 3 X Stuff bits<br />

[31:8] 24 X I/O ORC<br />

492/995 Doc ID 13902 Rev 9

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