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RM0008
Table 128. Card status (continued)
Secure digital input/output interface (SDIO)
Bits
Identifier
Type
Value
Description
Clear
condition
(Undefined by the standard) A generic
19
ERROR
EX
’0’= no error
’1’= error
card error related to the (and detected
during) execution of the last host
C
command (e.g. read or write failures).
18
17
Reserved
Reserved
Can be either of the following errors:
– The CID register has already been
written and cannot be overwritten
16
CID/CSD_OVERWRITE
EX
’0’= no error ‘1’=
error
– The read-only section of the CSD does
not match the card contents
C
– An attempt to reverse the copy (set as
original) or permanent WP
(unprotected) bits was made
15
WP_ERASE_SKIP
EX
’0’= not protected Set when only partial address space
’1’= protected was erased due to existing write
C
14
CARD_ECC_DISABLED S X
’0’= enabled
’1’= disabled
The command has been executed without
using the internal ECC.
A
An erase sequence was cleared before
13
ERASE_RESET
’0’= cleared
’1’= set
executing because an out of erase
sequence command was received
(commands other than CMD35, CMD36,
C
CMD38 or CMD13)
0 = Idle
1 = Ready
12:9
CURRENT_STATE
SR
2 = Ident
3 = Stby
4 = Tran
5 = Data
6 = Rcv
7 = Prg
8 = Dis
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 on the next
command. The four bits are interpreted as
a binary number between 0 and 15.
B
9 = Btst
10-15 = reserved
8
READY_FOR_DATA
SR
’0’= not ready ‘1’
= ready
Corresponds to buffer empty signalling on
the bus
7
SWITCH_ERROR
EX
’0’= no error
’1’= switch error
If set, the card did not switch to the
expected mode as requested by the
SWITCH command
B
6
Reserved
5
APP_CMD
SR
‘0’ = Disabled
‘1’ = Enabled
The card will expect ACMD, or an
indication that the command has been
interpreted as ACMD
C
4
Reserved for SD I/O Card
Doc ID 13902 Rev 9
481/995
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