SanDisk SDSDB-016G-A11 Product Manual - Page 97

Memory Array Partitioning

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Revision 2.2 Chapter 5 - SPI Protocol SD Card Product Manual recover (e.g., reset the card, power cycle, reject). The typical access and program times are defined in the following sections. 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. 5.11 Memory Array Partitioning See SD Card Bus Mode. 5.12 Card Lock/Unlock Usage of card lock and unlock commands in SPI mode is identical to SD mode. In both cases the command is responded with a R1b response type. After the busy signal clears, the host should obtain the result of the operation by issuing a GET_STATUS command. 5.13 Application-specific Commands The application-specific commands are identical to SD mode with the exception of the APP_CMD status bit, which is not available in SPI mode. 5.14 Copyright Protection Commands All the special copyright protection ACMDs and security functionality are the same as for SD Bus mode. 5.15 Switch Function Command Same as for SD mode with two exceptions: • The command is valid under the "not idle state". • In SPI mode, CMD0 switching period is within 8 clocks after the end bit of the CMD0 command R1 response. 5.16 High-speed Mode (25MB/sec interface speed) Not available in SPI Mode. © 2004 SanDisk Corporation 5-7 12/08/04

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Chapter 5 – SPI Protocol
Revision 2.2
SD Card Product Manual
© 2004 SanDisk Corporation
5-7
12/08/04
recover (e.g., reset the card, power cycle, reject). The typical access and program times are
defined in the following sections.
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.
5.11
Memory Array Partitioning
See SD Card Bus Mode.
5.12
Card Lock/Unlock
Usage of card lock and unlock commands in SPI mode is identical to SD mode. In both
cases the command is responded with a R1b response type. After the busy signal clears, the
host should obtain the result of the operation by issuing a GET_STATUS command.
5.13
Application-specific Commands
The application-specific commands are identical to SD mode with the exception of the
APP_CMD status bit, which is not available in SPI mode.
5.14
Copyright Protection Commands
All the special copyright protection ACMDs and security functionality are the same as for
SD Bus mode.
5.15
Switch Function Command
Same as for SD mode with two exceptions:
•
The command is valid under the "not idle state".
•
In SPI mode, CMD0 switching period is within 8 clocks after the end bit of the CMD0
command R1 response.
5.16
High-speed Mode (25MB/sec interface speed)
Not available in SPI Mode.