4.0 Multimediacard Interface Description; Physical Description; Pin Assignments In Multimediacard Mode; Pin Assignments In Spi Mode - SanDisk SDMB-16-470 - 16 MB MultiMedia Card Product Manual

4.0 MultiMediaCard Interface Description

4.1

Physical Description

The MultiMediaCard has seven exposed contacts on one side. (See Figure 2-1.) The host is connected to
the MultiMediaCard using a seven pin connector as shown in the Appendix at the end of this manual.
4.1.1

Pin Assignments in MultiMediaCard Mode

Table 4-1 MultiMediaCard Pad Definition
Pin #
1
2
3
4
5
6
7
*Note: S=power supply; I=input; O=output; PP=push-pull; OD=open-drain; NC=not connected.
4.1.2

Pin Assignments in SPI Mode

Table 4-2 SPI Pad Definition
Pin #
1
2
3
4
5
6
7
*Note: S=power supply; I=input; O=output.
4.2

MultiMediaCard Bus Topology

The MultiMediaCard bus has three communication lines and four supply lines:
•
CMD: Command is a bi-directional signal. Host and card drivers are operating in two modes,
open drain and push pull.
•
DAT: Data is a bi-directional signal. Host and card drivers are operating in push pull mode.
•
CLK: Clock is a host to card signal. CLK operates in push pull mode.
•
VDD: VDD is the power supply line for all cards.
•
VSS[1:2]: VSS are two ground lines.
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
Name T y p e *
RSV NC
CMD I/O/PP/OD
VSS1 S
VDD S
CLK I
VSS2 S
DAT[0] I/O/PP
Name T y p e *
CS I
DataIn I
VSS1 S
VDD S
CLK I
VSS2 S
DataOut O
MultiMediaCard Product Manual
MultiMediaCard Description
Not Connected or Always '1'
Command/Response
Supply voltage ground
Supply voltage
Clock
Supply voltage ground
Data 0
SPI Description
Chip Select (Active low)
Host to Card Commands and Data
Supply Voltage Ground
Supply Voltage
Clock
Supply Voltage Ground
Card to Host Data and Status
19