Product manual

Secure Digital (SD) Card Protocol Description
SanDisk Industrial Grade SD Product Manual, Rev. 1.0 © 2003 SANDISK CORPORATION -4-23
Table 4-10 describes all the application specific commands supported/reserved by the Industrial Grade SD Card. All
the following ACMDs shall be preceded with APP_CMD command (CMD55)
.
Table 4-10. Application Specific Commands Used/Reserved by SD Card
ACMD
INDEX
Type Argument Resp. Abbreviation Command Description
ACMD6 ac [31:2] stuff bits
[1:0]bus width
R1 SET_BUS_WIDTH Defines the data bus width (’00’=1bit or ’10’=4 bits bus)
to be used for data transfer.
ACMD13 adtc [31:0] stuff bits R1 SD_STATUS Send the SD Card status. The status fields are given in
Table 4-28.
ACMD17 Reserved
ACMD18 -- -- -- -- Reserved for SD security applications.
1
ACMD19
to
ACMD21
Reserved
ACMD22 adtc [31:0] stuff bits R1 SEND_NUM_WR_
BLOCKS
Send the number of the written (without errors) write
blocks. Responds with 32bit+CRC data block.
ACMD23 ac [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 -- -- -- -- Reserved for SD security applications.
1
ACMD26 -- -- -- -- Reserved for SD security applications.
1
ACMD38 -- -- -- -- Reserved for SD security applications.
1
ACMD39
to
ACMD40
Reserved
ACMD41 bcr [31:0]OCR
without busy
R3 SD_APP_OP_COND
A
sks the accessed card to send its operating condition
register (OCR) con tent in the response on the CMD
line.
ACMD42 ac [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
-- -- -- -- Reserved for SD security applications.
1
ACMD51 adtc [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.