MultiMediaCard

The MultiMediaCard, officially abbreviated as MMC, is a memory card standard used for solid-state storage. Unveiled in 1997 by SanDisk and Siemens, MMC is based on a surface-contact low pin-count serial interface using a single memory stack substrate assembly, and is therefore much smaller than earlier systems based on high pin-count parallel interfaces using traditional surface-mount assembly such as CompactFlash. Both products were initially introduced using SanDisk NOR-based flash technology. MMC is about the size of a postage stamp: 32 mm × 24 mm × 1.4 mm. MMC originally used a 1-bit serial interface, but newer versions of the specification allow transfers of 4 or 8 bits at a time. MMC can be used in many devices that can use Secure Digital (SD) cards. MMCs may be available in sizes up to 16 gigabytes (GB). They are used in almost every context in which memory cards are used, like cellular phones, digital audio players, digital cameras, and PDAs. Typically, an MMC operates as a storage medium for devices, in a form that can easily be removed for access by a PC via a connected MMC reader. The latest version of the eMMC standard (JESD84-B51) by JEDEC is version 5.1A, released January 2019, with speeds (250 MB/s read, 125 MB/s write) rivaling discrete SATA-based SSDs (400 MB/s). As of 23 September 2008, the MultimediaCard Association (MMCA) turned over all MMC specifications to the JEDEC organization including embedded MMC (e-MMC), SecureMMC, and miCARD assets. JEDEC is an organization devoted to standards for the solid-state industry. The latest specifications, version 5.1, can be requested from JEDEC, free-of-charge for JEDEC members. Older versions of the standard, as well as some optional enhancements to the standard such as MiCard and SecureMMC, must be purchased separately. While there is no royalty charged for devices to host an MMC or , a royalty may be necessary in order to manufacture the cards themselves. A highly detailed datasheet that contains essential information for writing an MMC host driver is available online.

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