How to Use MMC/SDC
Update: June 11, 2008
SD Memory Card (Secure Digital Memory Card) is the most popular memory card for mobile
equipments. The SD Memory Card (SDC below) was developped as upper-compatible to Multi
(MMC below) so that the SDC compleant equipments can also use an MMC with a few
considerations. There are also reduced size versions, such as RS-MMC, miniSD and microSD, with
same function. The MMC/SDC has a microcontroller in it, the flash memory controls (erase, read,
write and error control) are completed at inside of the memory card. The data is transferred between
memory card and host controller in unit of 512 bytes per block in default, so that it can be
generic hard disk drive from view point of application programs. The
currentry defined file system is
only FAT12/16 with FDISK patitioning rule. The FAT32 is defined for only high capacity (>= 4G)
cards.
This page describes the basic knowledge and miscellaneous things that I become aware, on using
MMC/SDC with small embedded system. I believe that this information must be a useful getting
started notes for people who is going to begin to enjoy MMC/SDC.
Contact Surface
页码,1/9ELM - How to Use MMC/SDC
2008-8-6http://elm-chan.org/docs/mmc/mmc_e.html
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