Memory Array Partitioning; Card Lock/Unlock; Application Specific Commands; Copyright Protection Commands - SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual

SPI Protocol Definition
Read
The read access time is defined as the sum of the two times given by the CSD parameters TAAC and NSAC. These
card parameters define the typical delay between the end bit of the read command and the start bit of the data block.
Write
The R2W_FACTOR field in the CSD is used to calculate the typical block program time obtained by multiplying
the read access time by this factor. It applies to all write/erase commands (e.g., SET (CLEAR)_WRITE_PROTECT,
PROGRAM_CSD (CID) and the block write commands).
Erase
The duration of an erase command will be (order of magnitude) the number of write blocks (WRITE_BL) to be
erased multiplied by the block write delay.

5.1.10. Memory Array Partitioning

Same as for SD Card mode.

5.1.11. Card Lock/Unlock

The Card Lock/Unlock feature is currently in the SanDisk SD Card.

5.1.12. Application Specific Commands

The Application Specific commands are identical to SD mode with the exception of the APP_CMD status bit (see
Section 3.5.5), which is not available in SPI.

5.1.13. Copyright Protection Commands

All the special Copyright Protection ACMDs and security functionality are the same as for SD mode.

5.2. SPI Command Set

The following sections provide valuable information on the SPI Command Set.

5.2.1. Command Format

All the SD Card commands are 6 bytes long and transmitted MSB first.
Byte 1
7 6 5
0 1 Command
5-8
Bytes 2—5
0 31
Command Argument
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
Byte 6
0 7
CRC
0
1