SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 39

• 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
MultiMediaCard Protocol Description
The host (master) controls all communication between the host and MultiMediaCard/RS-
MultiMediaCard. The host sends the following two types of commands:
A general overview of the command flow is shown in Figure 4-1 for the Card Identification
Mode and Figure 4-2 for the Data Transfer Mode. The commands are listed in Table 4-5 to
4-7. The dependencies between the current MultiMediaCard/RS-MultiMediaCard state,
received command and following state are listed in Table 4-1. In the following sections, the
different card operation modes will be described first. Thereafter, the restrictions for
controlling the clock signal are defined. All card commands together with the
corresponding responses, state transitions, error conditions and timings are presented in the
following sections.
The MultiMediaCard/RS-MultiMediaCard has two operation modes.
Table 4-1 lists the dependencies between operation modes and card states. Each state in the
card state diagram (Figure 4-1 and 4-2) is associated with one operation mode.
Table 4-1
If a command with improper CRC was received, it is ignored. If there was a command
execution (e.g., continuous data read) the card continues in the operation until it gets a
correct host command.
• Broadcast Commands—Broadcast commands are intended for all MultiMediaCards
• Addressed (Point-to-Point) Commands—The addressed commands are sent to the
• Card Identification Mode— The host will be in card identification mode after reset and
• The Interrupt Mode option defined in the MultiMediaCard Standard is not
• Data Transfer Mode—MultiMediaCards will enter data transfer mode once an RCA is
Inactive
Idle, Ready, Identification
Standby, Transfer, Send data,
Receive data, Programming,
Disconnect
and RS-MultiMediaCards . Some of these commands require a response
addressed cards and cause a response to be sent from this card.
while it is looking for new cards on the bus. MultiMediaCards will be in this mode
after reset until the SET_RCA command (CMD3) is received.
implemented on the SanDisk MultiMediaCard.
assigned to them. The host will enter data transfer mode after identifying all the
MultiMediaCards on the bus.
Card State
Card States vs. Operation Modes Overview
Card Identification Mode
Inactive
Data Transfer Mode
4-1
Operation Mode
MultiMediaCard/RS-MultiMediaCard Product Manual
Chapter 4 – MultiMediaCard Protocol Description
Open-drain
Push-pull
Bus Mode
04/22/05