SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 40

• 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
4.1.1
4.1.2
4.1
Card Identification Mode
Reset
Operating Voltage Range Validation
While in Card Identification Mode, the host resets all the cards that are in Card
Identification Mode, validates operation voltage range, identifies cards and asks them to
publish a Relative Card Address (RCA). This operation is done to each card separately on
its own command (CMD) line. All data communication in the Card Identification Mode
uses the CMD line only.
Figure 4-1
GO_IDLE_STATE (CMD0) is the software-reset command that sets each MultiMediaCard
or RS-MultiMediaCard to Idle State regardless of the current state of the card. Cards
already in an inactive state are not affected by this command.
After power-on by the host, all cards are in Idle State, including the cards that were in
Inactive State.
After power-on or CMD0, all card CMD lines are in input mode, waiting for the start bit of
the next command. The cards are initialized with a default relative card address
(RCA=0x0000) and with a default driver stage register setting (lowest speed, highest
driving current capability).
The MultiMediaCard standard requires that all MultiMediaCards and RS-MultiMediaCards
be able to establish communication with the host using any operating voltage between
1
At least 74 clock cycles are required prior to starting bus communication.
1
MultiMediaCard State Diagram—Card Identification Mode
4-2
MultiMediaCard/RS-MultiMediaCard Product Manual
Chapter 4 – MultiMediaCard Protocol Description
04/22/05