Chapter 5 – SPI Protocol
Revision 2.2 SD Card Product Manual
© 2004 SanDisk Corporation 5-11 12/08/04
CMD
Index
SPI
Mode
Argument Resp Abbreviation Description
(WP_GRP_SIZE).
CMD29 Yes [31:0] data address R1b CLR_WRITE_
PROT
If the card has write
protection features,
this command clears
the write protection bit
of the addressed
group.
CMD30 Yes [31:0] write protect data
address
R1 SEND_WRITE_
PROT
If the card has write
protection features,
this command asks
the card to send the
status of the write
protection bits.
CMD31 Reserved
CMD32 Yes [31:0] data address R1 ERASE_WR_BLK_
START_ADDR
Sets the address of
the first write block to
be erased.
CMD33 Yes [31:0] data address R1 ERASE_WR_BLK_
END_ADDR
Sets the address of
the last write block in
a continuous range to
be erased.
CMD34
…
CMD37
Reserved for each command system set by switch function command (CMD6). Detailed
definition can be referenced in each command system specification.
CMD38 Yes [31:0] stuff bits R1b ERASE Erases all previously
selected write blocks.
CMD39 No --- --- --- ---
CMD40 No --- --- --- ---
CMD41 Reserved
CMD42 Yes [31:0] stuff bits R1 LOCK_UNLOCK Used to set/re-set the
password or
lock/unlock the card.
A transferred data
block includes all the
command details. The
size of the data block
is defined with
SET_BLOCK_LEN
command.
CMD43-
CMD49
CMD51
Reserved.
CMD50 Reserved for each command system set by switch function command (CMD6). Detailed
definition can be referenced in each command system specification.
CMD52
…
CMD54
Reserved for I/O mode (refer to SDIO Card Specification).
CMD55 Yes [31:0] stuff bits R1 APP_CMD Notifies the card that
the next command is
an application-specific
command rather than
a standard command.
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