Card datasheet memory mmc


MMC, short for Multimedia card, is a type of memory card unveiled by SanDisk and Siemens in 1997. MMC card has a large size compared with CF card. MMC card is usually available in digital cameras, mobile phones and PDA. MMC cards include RS-MMC, MD-MMC, MMC PLUS, MMC mobile, MMC micro and DV-MMC. Micro SD Memory Card uses a subset of the Micro SD Memory Card protocol and command set. The Micro SD Memory Card identification and addressing algorithms are replaced by a hardware Chip Select (CS) signal. A card (slave) is selected, for every command, by asserting (active low) the CS signal. Note that a memory card's dimensions are determined while holding the card with contact pins upwards. The length of cards is often greater than their width. Most cards show a directional arrow to aid insertion; such an arrow should be upward. media from the xD-Picture CardTM (xD)2, Memory Stick ® (MS), Secure Digital (SD), and MultiMedia-CardTM (MMC) families. The USB224x is a fully integrated, single chip solution capable of ultra high performance operation. Average sustained transfer rates exceeding 35 MB/s are possi-ble if the media and host can support those rates. The SD/MMC cards which use the MMC subsystem are available as block device through /dev/mmcblk{id}. The kernel normally parses the partition table and exports the partitions of the card using the appendix p{x}, e.g. /dev/mmcblk{id}p{x}.