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RM0008
Secure digital input/output interface (SDIO)
Table 138. Block-oriented write protection commands
CMD
index
Type
Argument
Response
format
Abbreviation
Description
If the card has write protection features,
CMD28 ac
[31:0] data
address
R1b
SET_WRITE_PROT
this command sets the write protection bit
of the addressed group. The properties of
write protection are coded in the card-
specific data (WP_GRP_SIZE).
CMD29 ac
CMD30 adtc
[31:0] data
address
[31:0] write
protect data
address
R1b
R1
CLR_WRITE_PROT
SEND_WRITE_PROT
If the card provides write protection
features, this command clears the write
protection bit of the addressed group.
If the card provides write protection
features, this command asks the card to
send the status of the write protection
bits.
CMD31 Reserved
Table 139. Erase commands
CMD
index
Type
Argument
Response
format
Abbreviation
Description
CMD32
...
CMD34
Reserved. These command indexes cannot be used in order to maintain backward compatibility with older
versions of the MultiMediaCard.
Sets the address of the first erase
CMD35 ac
[31:0] data address R1
ERASE_GROUP_START group within a range to be selected
for erase.
Sets the address of the last erase
CMD36 ac
[31:0] data address R1
ERASE_GROUP_END
group within a continuous range to be
selected for erase.
CMD37
Reserved. This command index cannot be used in order to maintain backward compatibility with older
versions of the MultiMediaCards
CMD38 ac
[31:0] stuff bits
R1
ERASE
Erases all previously selected write
blocks.
Table 140. I/O mode commands
CMD
index
Type
Argument
Response
format
Abbreviation
Description
Used to write and read 8-bit (register) data
[31:16] RCA
[15:15] register
fields. The command addresses a card and a
register and provides the data for writing if
CMD39 ac
write flag
[14:8] register
R4
FAST_IO
the write flag is set. The R4 response
contains data read from the addressed
address
[7:0] register data
Doc ID 13902 Rev 9
register. This command accesses
application-dependent registers that are not
defined in the MultiMediaCard standard.
489/995
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