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SPI Protocol Definition

Table 5-3 describes all the application specific commands supported or reserved by the Industrial Grade SD Card.

All the following commands should be preceded with APP_CMD (CMD55).

Table 5-3. Application Specific Commands Used or Reserved by the SD Card–SPI Mode

CMD

INDEX

SPI Mode Argument Resp Abbreviation Command Description

ACMD6 No

ACMD13 Yes [31:0] stuff bits

R2 SD_STATUS

Send the SD Card status. The status fields are

given in Table 4-21

ACMD17 Reserved

ACMD18 Yes -- -- -- Reserved for SD security applications1

ACMD19

ACMD21

Reserved

ACMD22 Yes [31:0] stuff bits

R1 SEND_NUM_WR_ BLOCKS Send the numbers of the well-written (without

errors) blocks. Responds with 32bit+CRC data

block.

ACMD23 Yes [31:23] stuff bits

[22:0]Number of blocks

R1 SET_WR_BLK_

ERASE_COUNT

Set the number of write blocks to be pre-erased

before writing (to be used for faster Multiple Block

WR command). “1”=default (one wr block)(2).

ACMD24 Reserved

ACMD25 Yes -- -- -- Reserved for SD security applications1

ACMD26 Yes -- -- -- Reserved for SD security applications1

ACMD38 Yes -- -- -- Reserved for SD security applications1

ACMD39

ACMD40

Reserved

ACMD41 Yes None R1 SEND_OP_

COND

Activates the card’s initialization process.

ACMD42 Yes [31:1] stuff bits

[0]set_cd

R1 SET_CLR_CARD_

DETECT

Connect[1]/Disconnect[0] the 50KOhm pull-up

resistor on CD/DAT3 (pin 1) of the card. The pull-up

may be used for card detection.

ACMD43

...

ACMD49

Yes -- -- -- Reserved for SD security applications.

ACMD51 Yes [31:0] staff bits R1 SEND_SCR Reads the SD Configuration Register (SCR).

NOTES: (1) Refer to “SD Card Security Specification” for detailed explanation about the SD Security Features

(2) Command STOP_TRAN (CMD12) shall be used to stop the transmission in Write Multiple Block whether the pre-

erase (ACMD23) feature is used or not.

5.2.3. Responses

There are several types of response tokens. As in the SD Card mode, all are transmitted MSB first.