SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 72

• Manufacturer Part Number: SDMJ-32
• Manufacturer: SanDisk
• Type: MultiMedia Cardr

Specifications of SDMJ-32

• Density: 32MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): -25C
• Operating Temperature (max): 85C
• Package Type: MMC
• Mounting: Socket
• Pin Count: 7
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / RoHS Status: Compliant

Revision 1.3
© 2005 SanDisk Corporation
5.9
5.10
5.11
Erase and Write Protect Management
Read CID/CSD Registers
Reset Sequence
is reselected before the programming has finished, the dataOut line will be forced back to
low and all commands will be rejected.
Resetting a card (using CMD0) will terminate any pending or active programming
operation. However, this may destroy data formats on the card. It is the host’s responsibility
to prevent that from happening.
Erase and Write Protect Management procedures in SPI Mode and MultiMediaCard mode
are identical. When the card is erasing or changing the write protection bits of the
predefined write-protect group list, it will be in a busy state and hold the dataOut line low.
Figure 5-11 illustrates a “no data” bus transaction with and without busy signaling.
Figure 5-11
Unlike MultiMediaCard Protocol where the register contents are sent as a command
response, SPI Mode provides a simple read block transaction for reading the contents of the
CSD and CID registers. The card will respond with a standard response token followed by
a data block of 16 bytes, suffixed with a 16-bit CRC.
The data timeout for the CSD command cannot be set to the card TAAC because its value
is stored in the CSD. Therefore, the standard response timeout value (N
latency of the CSD register.
The MultiMediaCard/RS-MultiMediaCard requires a defined reset sequence. After power-
on reset or software reset (CMD0), the card enters an idle state. In this state, the only legal
host commands are CMD1 (SEND_OP_COND) and CMD58 (READ_OCR).
The host must poll the card by repeatedly sending CMD1 until the “in-idle-state” bit in the
card response indicates, by being set to 0, that the card completed its initialization
processes and is ready for the next command.
However, in SPI mode, CMD1 has no operands and does not return the contents of the
OCR Register. Instead, the host can use CMD58 (SPI Mode Only) to read the register. It is
the responsibility of the host to refrain from accessing cards that do not support its voltage
range.
The use of CMD58 is not restricted to the initialization phase only, but can be issued at any
time. The host must poll the card by repeatedly sending CMD1 until the “in-idle-state” bit
DataIn
DataOut
From Host
to Card
Command
No Data Operations
From Card
to Host
Response
5-7
MultiMediaCard/RS-MultiMediaCard Product Manual
Command
From Host
to Card
Response
Chapter 5 –SPI Mode
CR
Busy
) is used for read
From Card
to Host
04/21/05