SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 17

• 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
3.2
MultiMediaCard/RS-MultiMediaCard Bus Topology
The MultiMediaCard/RS-MultiMediaCard bus has three communication lines and four
supply lines.
•
•
•
•
•
The description of each signal is contained in Table 3-2.
Table 3-2
Figure 3-1 shows the bus circuitry with one host in MultiMediaCard mode.
Figure 3-1
The R
mode transitions. R
against bus floating when no card is inserted or all card drivers are in a hi-impedance
mode.
A constant current source can replace the R
(constant slopes for the signal rising and falling edges). If the host does not allow the
switchable R
operating frequency in the open-drain mode has to be reduced in this case.
CMD
DAT
CLK
VDD
VSS [1:2]
CMD
DAT
CLK
VDD
VSS[1:2]
Name
OD
is switched on and off by the host synchronously to the open-drain and push-pull
OD
implementation, a fixed R
Command is a bi-directional signal. Host and card drivers are operating in two
modes: open drain and push-pull.
Data line is a bi-directional signal. Host and card drivers are operating in push-pull
mode.
Clock is a host to card signal. CLK operates in push-pull mode.
VDD is the power supply line for all cards.
VSS are two ground lines.
Bus Signal Descriptions
Bus Circuitry Diagram
DAT
and R
CMD
are pull-up resistors protecting the CMD and DAT line
3-2
MultiMediaCard and RS-MultiMediaCard Product Manual
CMD
OD
can be used. Consequently the maximum
Description
in order to achieve better performance
Chapter 3 –Interface Description
07/15/05