Specifications

©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
74
ACMD
INDEX
type argument resp abbreviation command description
ACMD1-5
Reserved
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. The allowed data bus widths
are given in SCR register.
ACMD7-12
Reserved
ACMD13
adtc
[31:0] stuff bits
R1
SD_STATUS
Send the SD Status. The status fields
are given in Table 4-43.
ACMD14-16
Reserved for DPS Specification
ACMD17
Reserved
ACMD18
Reserved for SD security applications
1
ACMD19-21
Reserved
ACMD22
adtc
[31:0] stuff bits
R1
SEND_NUM_WR_
BLOCKS
Send the number of the written (with-
out errors) write blocks. Responds with
32bit+CRC data block.
If WRITE_BL_PARTIAL='0', the unit of
ACMD22 is always 512 byte.
If WRITE_BL_PARTIAL='1', the unit of
ACMD22 is a block length which was
used when the write command was
executed.
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 com-
mand). "1"=default (one wr block)
2
.
ACMD24
Reserved
ACMD25
Reserved for SD security applications
1
ACMD26
Reserved for SD security applications
1
ACMD27
Shall not use this command
ACMD28
Reserved for DPS Specification
ACMD29
Reserved
ACMD30-35
Reserved for Security Specification
ACMD36-37
Reserved
ACMD38
Reserved for SD security applications
1
ACMD39-40
Reserved