SDIO
Commands Table
| CMD Index | Argument | Response | Abbreviation | Command Description |
|---|---|---|---|---|
| CMD18 | [31:0] data address | R1 | READ_MULTIPLE_BLOCK | Continuously transfers data blocks from card to host until interrupted by a STOP_TRANSMISSION command. |
Responses
R1 (normal response command)
| Bit position | 47 | 46 | [45:40] | [39:8] | [7:1] | 0 |
|---|---|---|---|---|---|---|
| Width (bits) | 1 | 1 | 6 | 32 | 7 | 1 |
| Value | '0' | '0' | x | x | x | '1' |
| Description | start bit | transmission bit | command index | card status | CRC7 | end bit |
R1b
R2 (CID, CSD register)
R3 (OCR register)
R6 (Published RCA response)
R7 (Card interface condition)
References
| SD Specifications Part E1 SDIO Simplified Specification | http://academy.cba.mit.edu/classes/networking_communications/SD/SD.pdf |