Chapter 4 – SD Card Protocol Description
Revision 2.2 SanDisk SD Card Product Manual
© 2004 SanDisk Corporation 4-32 12/08/04
Class 0 1 2 3 4 5 6 7 8 9 10 11
CMD
Basic R Block
Read
R Block
Write
Erase Write
Protec
tion
Lock
Card
App-
Specific
I/O
Mode
Switch R
CMD28 +
CMD29 +
CMD30 +
CMD32 +
CMD33 +
CMD34
21
to
CMD37
+
CMD38 +
CMD42 +
CMD50
22
+
CMD52 +
CMD53 +
CMD55 +
CMD56 +
CMD57
23
+
ACMD6 +
ACMD13 +
ACMD22 +
ACMD41 +
ACMD42 +
ACMD51 +
R = Reserved
4.8.4 Command Description
All future reserved commands and their responses must be 48 bits long. Responses may
not have any response. Table 4-16 details the SD Card bus commands.
Table 4-16 SD Card Bus Command Descriptions
CMD Index Type Argument Resp. Abbreviation Description
Basic Commands (Class 0)
CMD0 bc [31:0] stuff
bits
--- GO_IDLE_STATE Reset all cards to Idle
State.
CMD1 Reserved
CMD2 bcr [31:0]stuff
bits
R2 ALL_SEND_CID Asks all cards to send
their CID numbers on
the CMD line.
21
This command is newly defined in SD Card Physical Description Spec. v1.10 .
22
Ibid.
23
Ibid.
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