MultiMedia Card uses a 7-Pin connector [1 rows of 7 pins]. The 7-pin
connector is on 2.5-mil centers. The seven pin interface consists of
three pins dedicated to the SPI serial bus [SCK, SI, and SO], a Chip
Select signal [CS], a Chip Reset [RESET], a Write Protect line [WP], and
an output Ready/Busy [RDY/Busy] signal. All of the control signals except
the RDY signal are active low. The SPI interface uses the Serial Clock
[SCK] line, Serial Input [SI], and the Serial Output [SO] line. How ever
the physical DataFlash card does not have all the signals listed above,
refer to the pinout table shown below. A few of the signals listed above
may only be found on the DataFlash Integrated Circuits [ICs]. A smaller
form factor of MMC is called Reduced Size MultiMedia Card [RS-MMC]. The
RS-MMC card is 24mm x 16mm x 1.5mm. The RSMMC remains pin compatible with
the MMC module, but shorter
The newer versions of the standard; MMCplus, MMCmobile and MMCmicro,
offer the higher transfer speeds up to 52MB/sec, or 416 Mbits/sec, and
support for dual-voltage operation (1.8 and 3/3.3V), and multiple bus
widths (x1, x4 and x8 bit). MMCplus, MMCmobile and MMCmicro utilize 13
pins while remaining backwards compatible with the previous version of
7-pin MMC cards.
The MultiMedia card dimensions are: 1.4mm thick x 24mm wide x 32mm long.
The 7-pin cards are form factor compatible with the DataFlash Card
standard, and pin out compatible to the SPI version of the MMC card.
A short description of the SPI interface is listed on the Integrated Circuit Buses
Pin # | Pin name | Signal Function |
1 | CS* | Chip Select |
2 | SI | Serial Input [SPI] |
3 | GND | Ground |
4 | Vcc | Voltage Supply [2.7v or 3.6v] |
5 | SCK | Serial Clock [SPI] |
6 | NC | No Connect |
7 | SO | Serial Output [SPI] |
Refer to this page for a list of different Flash Memory Stick Formats.
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