SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 7

• 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
1.12.3
1.12.4
1.12.5
Card Acquisition and Identification
Card Status
Memory Array Partitioning
and ignore any bus communication. The only way to get a card out of an inactive state is by
powering the card down and up again.
In addition, the host can explicitly send either card to an inactive state by using the
GO_INACTIVE_STATE command.
The MultiMediaCard and RS-MultiMediaCard bus is a single master (host application) and
multi-slaves (cards) bus. The host can query the bus and determine how many cards, and of
which type, are connected. The card’s CID Register is pre-programmed with a unique card
identification number used during the identification procedure.
In addition, the card host can read either card’s CID Register using the READ_CID
command. The CID Register is programmed during MultiMediaCard and RS-
MultiMediaCard testing and formatting procedures during manufacturing. The card host
can only read, and not write to the CID Register.
The MultiMediaCard and RS-MultiMediaCard status is stored in a 32-bit status register
that is sent as the data field, in the card response to host commands. The Status Register
provides information about the card’s active state and completion codes for the last host
command
The card status can be explicitly polled with the SEND_STATUS command.
The MultiMediaCard/RS-MultiMediaCard memory space is byte addressable with
addresses ranging from 0 to the last byte, and is divided into several structures.
Memory bytes are grouped into 512-byte blocks called sectors. Every block can be read,
written and erased individually. Sectors are grouped into erase groups of 16 or 32 sectors
depending on card size. Any combination of sectors within one group, or any combination
of erase groups can be erased with a single erase command. A write command implicitly
erases the memory before writing new data into it. An explicit erase command can be used
for pre-erasing memory and speed up the next write operation. Erase groups are grouped
into Write Protect Groups (WPG) of 32 erase groups. The write/erase access to each
WPG can be limited individually. The last (highest in address) WPG will be smaller and
contain less than 32 erase groups.
A diagram of the memory structure hierarchy is shown in Figure 1-2. Table 1-1
summarizes the number of various memory structures for the different MultiMediaCards
and RS-MultiMediaCards.
1-5
MultiMediaCard/RS-MultiMediaCard Product Manual
Chapter 1 – Introduction
03/22/05