SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual page 71

Cmd Type Argument
Index
CMD16 ac [31:0] block length
CMD17 adtc [31:0] data address
CMD18 adtc [31:0] data address
CMD19 –
CMD23
Cmd Type Argument
Index
CMD24 adtc [31:0] data address
CMD25 adtc [31:0] data address
CMD26
CMD27 adtc [31:0] don't care*
* The bit places must be filled but the value is irrelevant.
Cmd Type Argument
Index
CMD28* ac [31:0] data address
CMD29* ac [31:0] data address
CMD30* adtc [31:0] write protect
data address
CMD31
1) The default block length is as specified in the CSD (512 bytes). A set block length of less than 512 bytes will
cause a write error. The only valid write set block length is 512 bytes. CMD16 is not mandatory if the default is
accepted.
2) The data transferred must not cross a physical block boundary.
3) All data blocks are responded to with a data response token followed by a busy signal. The data transferred
must not cross a physical block boundary.
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
Table 4-4. Block Read Commands (Class 2)
Resp Abbreviation
R1 SET_BLOCKLEN
R1 READ_SINGLE_
BLOCK
R1 READ_MULTIPLE_BLOCK
Reserved
Table 4-5. Block Write Commands (Class 4)
Resp Abbreviation
R1 WRITE_BLOCK
R1 WRITE_MULTIPLE_
BLOCK
Not Applicable
R1 PROGRAM_CSD
Table 4-6. Write Protection (Class 6)
Resp Abbreviation
R1b SET_WRITE_PROT
R1b CLR_WRITE_PROT
R1 SEND_WRITE_
PROT
Reserved
Secure Digital (SD) Card Protocol Description
Command Description
Selects a block length (in bytes) for all following
block commands (read and write).
Reads a block of the size selected by the
SET_BLOCKLEN command. 2
Continuously send blocks of data until interrupted
by a stop transmission command.
Command Description
Writes a block of the size selected by the
SET_BLOCKLEN command.
3
Continuously writes blocks of data until a
STOP_TRANSMISSION follows.
Programming of the programmable bits of the CSD.
Command Description
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).
This command clears the write protection bit of
the addressed group.
This command asks the card to send the status of
the write protection bits.
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