Chapter 3 – SD Card Interface Description
Revision 2.2 SD Card Product Manual
© 2004 SanDisk Corporation 3-21 12/08/04
Bit Identifier Type Value Description Clear
Cond.
19 ERROR E R X 0 = no error
1 = error
A general or an unknown
error occurred during the
operation.
C
18 Reserved
17 Reserved
16 CID/CSD_
OVERWRITE
E R X 0 = no error
1 = error
Can be either one of the
following errors: The CID
register has been already
written and can not be
overwritten- The read only
section of the CSD does not
match the card content.- An
attempt to reverse the copy
(set as original) or
permanent WP
(unprotected) bits was
made.
C
15 WP_ERASE_
SKIP
S X 0 = not protected
1 = protected
Only partial address space
was erased due to existing
write protected blocks.
C
14 CARD_ECC_
DISABLED
S X 0 = enabled
1 = disabled
The command has been
executed without using the
internal ECC.
A
13 ERASE_
RESET
S R 0 = cleared
1 = reset
An erase sequence was
cleared before executing
because an out of erase
sequence command was
received.
C
12-9 CURRENT_
STATE
S X 0 = idle
1 = ready
2 = ident
3 = stby
4 = tran
5 = data
6 = rcv
7 = prg
8 = dis
9-15 = reserved
The state of the card when
receiving the command. If
the command execution
causes a state change, it
will be visible to the host in
the response to the next
command. The four bits are
interpreted as a binary
coded number between 0
and 15.
B
8 READY_FOR_
DATA
S X 0 = not ready
1 = ready
Corresponds to buffer empty
signaling on the bus.
A
7-6
5 APP_CMD S R 0 = disabled
1 = enabled
The card will expect ACMD,
or indication that the
command has been
interpreted as ACMD.
C
4
3 AKE_SEQ_
ERROR
E R 0 = no error
1 = error
Error in the sequence of
authentication process.
C
2 Reserved for application-specific commands
1-0 Reserved for manufacturer test mode
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