Table of Contents
SD Commands
Document common commands supported by the SD card.
Search Table
| Command | Data Line | Response | Description | Version | Addend |
|---|---|---|---|---|---|
| CMD48 | R | R1 | Read single block of extension register. | 4.00 | May be supported on SDHC and SDXC. |
| CMD6 | R | R1 | Switch function. | 1.10 | |
| CMD58 | R | R1 | Read multiple blocks of extension register. | 4.10 | May be supported on SDHC and SDXC. |
| CMD49 | W | R1 | Write single block of extension register. | 4.00 | May be supported on SDHC and SDXC. |
| CMD59 | W | R1 | Write multiple blocks of extension register. | 4.10 | May be supported on SDHC and SDXC. |
| CMD9 | - | R2 | Obtain Device-specific data (CSD) on the CMD line. | ||
| CMD7 | b | R1b | Command toggles a device between the standby and transfer states or between the programming and disconnect states. | ||
| CMD13 | - | R1 | Addressed card sends its status register. | ||
| CMD32 | - | R1 | Specifies the address of the first block to be erase. | ||
| CMD33 | - | R1 | Specifies the address of the last block to be erase. | ||
| CMD38 | b | R1b | Erase function. |
CMD6
Response
R1
SD card will return 512-bits of status on data line.
Argument
| 31 | 30:24 | 23:20 | 19:16 | 15:12 | 11:8 | 7:4 | 3:0 |
|---|---|---|---|---|---|---|---|
| Mode | Resv | Resv | Resv | Power Limit | Drive Strength | Cmd System | Access Mode |
| 31 | Mode | * 0 - check * 1 - switch |
|---|---|---|
| 30:24 | Resv | |
| 23:20 | Resv | |
| 19:16 | Resv | |
| 15:12 | PL | |
| 11:8 | DS | |
| 7:4 | CS | |
| 3:0 | AM | * 0x0 - SDR12 * 0x1 - SDR25 * 0x2 - SDR50 * 0x3 - SDR104 * 0x4 - DDR50 |
CMD13
Description
Read card staus register or task status register.
Response
R1
Argument
| 31:16 | 15 | 14:0 |
| RCA | Send Task Status Register | Stuff Bits |
| 31:16 | RCA | |
| 15 | STSR | * 0 - SD card sends its status register * 1 - SD card sends its taks status register |
| 14:0 | SB |
CMD32
Description
Specifies the address of the first block to be erase.
Response
R1
Argument Data address.
Note
- SDSC uses byte unit address and SDHC/SDXC uses block unit address.
- eMMC uses CMD35 instead of CMD32.
CMD33
Description
Specifies the address of the last block to be erase.
Response
R1
Argument Data address.
Note:
- SDSC uses byte address and SDHC/SDXC uses block address.
- eMMC uses CMD36 instead of CMD33
CMD38
Description
Erase data.
Response
Argument
| 31:0 | * 1 - Discard * 2 - FULE * Others - Erase |
CMD58
Description
May be supported on SDHC and SDXC.
Response
R3
Argument
Stuff bit