what is the difference between MMC and SD card

[necromancer]

difference between mmc and sd card

i know that mmc and sd card are compatible but if i want to interface mcu with sd or mmc card. what is the best and difference.

 

[gidimiz]

Hi,

i know that mmc and sd card are compatible but if i want to interface mcu with sd or mmc card. what is the best and difference.

MultiMedia Cards (MMC) are about the size of a postage stamp and about as thick as a piece of cardboard. Secure Digital cards (SD) are the same width and length as an MMC card, but 0.7 mm thicker. They include security features that comply with current and future Secure Digital Music Initiative (SDMI) portable device requirements. They are designed for use with portable music players and other devices

Also have a look at this site:
www.geocities.com/romidar/mmcvssd.htm

To make it simple, MMC and SD are poth interfaced using the SPI protocol. The SD has few more pines, a bit bigger and slower.
MMC is very easy to interface faster and you can find few projects on the net.

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Good luck.

 

[Ignite]

Sd card has 2 types of protocols. The first is SPI and the other i SD. The SPI protocol is very common and easy to implement. SD protocol is more complex and secure. I read somewhere that the SD protocol is faster than the SPI, I don't know if that is true.