User Manual

SPI Protocol Definition
TriFlash with SD Interface Product Manual (Preliminary), Rev. 1.2 © 2002/2003 SANDISK CORPORATION
5-9
Table 5-2. Description of SPI Bus Commands
CMD
INDEX
SPI
Mode
Argument Resp Abbreviation Command Description
CMD0 Yes None R1 GO_IDLE_STATE Resets the TriFlash
CMD1 Yes None R1 SEND_OP_COND Activates the device’s initialization process.
CMD2 No
CMD3 No
CMD4 No
CMD5 Reserved
CMD6 Reserved
CMD7 No
CMD8 Reserved
CMD9 Yes None R1 SEND_CSD Asks the selected device to send its card-
specific data (CSD).
CMD10 Yes None R1 SEND_CID Asks the selected device to send its card
identification (CID).
CMD11 No
CMD12 Yes None R1b STOP_
TRANSMISSION
Forces the device to stop transmission during a
multiple block read operation.
CMD13 Yes None R2 SEND_STATUS Asks the selected device to send its status
register.
CMD14 No
CMD15 No
CMD16 Yes [31:0] block length R1 SET_BLOCKLEN Selects a block length (in bytes) for all following
block commands (read and write).
3
CMD17 Yes [31:0] data address R1 READ_SINGLE_
BLOCK
Reads a block of the size selected by the
SET_BLOCKLEN command.
4
CMD18 Yes [31:0] data address R1 READ_MULTIPLE_
BLOCK
Continuously transfers data blocks from card to
host until interrupted by a STOP_
TRANSMISSION command.
CMD19 Reserved
CMD20 No
CMD21
...
CMD23
Reserved
CMD24 Yes [31:0] data address R1
5
WRITE_BLOCK Writes a block of the size selected by the
SET_BLOCKLEN command.
6
CMD25 Yes [31:0] data address R1 WRITE_MULTIPLE_BLOCK Continuously writes blocks of data until a stop
transmission token is sent (instead of ‘start
block’).
3
The only valid block length for write is 512 bytes. The valid block length for read is 1 to 512 bytes. A set block length of less
than 512 bytes will cause a write error. The device has a default block length of 512 bytes. CMD16 is not mandatory if the
default is accepted.
4
The start address and block length must be set so that the data transferred will not cross a physical block boundary.
5
Data followed by data response plus busy.
6
The start address must be aligned on a sector boundary; the block length is always 512 bytes.