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See the Controller Manufacturers and Controllers for general information about card reader controllers. See the Card Readers and Controllers to check the controllers. Usage. Portable devices. Extended to. Secure Digital SDThe Multi. Media. Card MMC is a memory card standard used for solid state storage. Unveiled in 1. 99. San. Disk and Siemens AG,1 it 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 Compact. Flash. Both products were initially introduced using San. Disk NOR based Flash technology. MMC is about the size of a postage stamp 2. MMC originally used a 1 bitserial 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. Typically, an MMC is used as a storage medium for a portable device, in a form that can easily be removed for access by a PC. For example, a digital camera would use an MMC for storing image files. With an MMC reader typically a small box that connects via USB or some other serial connection, although some can be found integrated into the computer itself, a user could copy the pictures taken with the digital camera off to his or her computer. Modern computers, both laptops and desktops, often have SD slots, which can additionally read MMCs if the operating system drivers can. MMCs are available in sizes up to and including 5. GB. They are used in almost every context in which memory cards are used, like cellular phones, digital audio players, digital cameras and PDAs. The MultiMediaCard MMC is a memory card standard used for solidstate storage. Unveiled in 1997 by SanDisk and Siemens AG, it is based on a surface contact low pin. Instead of a hard drive, your new upgraded iPod will use flash memory with no moving parts for faster boot up access times and lower power consumption. I ran my. Since the introduction of SD cards, few companies build MMC slots into their devices an exception is some mobile devices like the Nokia 9. MMC is a benefit, but the slightly thinner, pin compatible MMCs can be used in almost any device that can use SD cards if the softwarefirmware on the device is capable. While few companies build MMC slots into devices today SD cards are more common, the embedded card e. Milwaukee 275322CT 18V Cordless M18 FUEL LithiumIon Brushless 14 in. Hex Impact Driver Kit Amazon. Milwaukee 275320 M18. MMC is still widely used in the industry as a primary means of integrated storage in portable devices. It provides a low cost flash memory system with a built in controller that can reside inside an Android or Windows phone or low cost PC and appear to its host as a bootable device, in lieu of a more expensive form of solid state storage, like the traditional solid state drive. Open standardedit. Top of four types of MMC cards clockwise from left MMC, RS MMC, MMCplus, MMCmobile, metal extender. Bottom of the same four cards. This technology is a standard available to any company wanting to develop products based on it. There is no royalty charged for devices which host an MMC. A membership with the MMC Association must be purchased in order to manufacture the cards themselves. As of July 2. 00. March 2. 00. 9 can be requested from the MMCA, and after registering with MMCA, can be downloaded free of charge. Older versions of the standard, as well as some optional enhancements to the standard such as Mi. Card and Secure. MMC, must be purchased separately. A highly detailed version is available on line2 that contains essential information for writing an MMC driver. As of 2. 3 September 2. MMCA group has turned overpermanent dead link all specifications to the JEDEC organization including embedded MMC e MMC and mi. CARD assets. JEDEC is an organization devoted to standards for the solid state industry. As of February 2. JEDEC, and after registering with JEDEC, can be downloaded free of charge. Older versions of the standard, as well as some optional enhancements to the standard such as Mi. Card and Secure. MMC, must be purchased separately. VariantseditIn 2. Reduced Size Multi. Media. Card RS MMC was introduced as a smaller form factor of the MMC, about half the size 2. The RS MMC uses a simple mechanical adapter to elongate the card so it can be used in any MMC or SD slot. RS MMCs are currently available in sizes up to and including 2 GB. The only significant hardware implementations of RS MMCs were Nokia and Siemens, who used to use RS MMC in their Series 6. Symbiansmartphones, the Nokia 7. Internet Tablet, and generations 6. Siemens. However, since 2. Nokias new devices with card slots have used mini. SD or micro. SD cards, with the company dropping support for the MMC standard in its products. Siemens exited the mobile phone business completely in 2. Siemens continue to use MMC for some PLC storage. The Dual Voltage Multimedia. Card DV MMC is one of the first acceptable changes in MMC was the introduction of dual voltage cards that can operate at 1. V in addition to 3. V. Running at lower voltages reduces the cards energy consumption, which is important in mobile devices. However, simple dual voltage parts quickly went out of production in favour of MMCplus and MMCmobile which offer capabilities in addition to dual voltage capability. MMCplus and MMCmobileeditThe version 4. MMC standard, introduced in 2. SD cards ability to run at higher speeds 2. MHz and 5. 2 MHz than the original MMC 2. MHz or SD 2. 5 MHz, 5. MHz and a four or eight bit wide data bus. Version 4. x full size cards and reduced size cards can be marketed as MMCplus and MMCmobile respectively. Version 4. x cards are fully backward compatible with existing readers but require updated hardwaresoftware to use their new capabilities even though the four bit wide bus and high speed modes of operation are deliberately electrically compatible with SD, the initialization protocol is different, so firmwaresoftware updates are required to use these features in an SD reader. MMCmicroeditMMCmicro is a micro size version of MMC. With dimensions of 1. RS MMC. Like MMCmobile, MMCmicro allows dual voltage, is backward compatible with MMC, and can be used in full size MMC and SD slots with a mechanical adapter. MMCmicro cards have the high speed and four bit bus features of the 4. It was formerly known as S card when introduced by Samsung on 1. December 2. 00. 4. It was later adapted and introduced in 2. Multi. Media. Card Association MMCA as the third form factor memory card in the Multi. Media. Card family. MMCmicro appears very similar to micro. SD but the two formats are not physically compatible and have incompatible pinouts. The Mi. Card is a backward compatible extension of the MMC standard with a theoretical maximum size of 2. GB 2 TB announced on 2 June 2. The card is composed of two detachable parts, much like a micro. SD card with an SD adapter. The small memory card fits directly in a USB port while it also has MMC compatible electrical contacts, which with an included electromechanical adapter fits in traditional MMC and SD card readers. To date, only one manufacturer Pretec has produced cards in this format. Developed by Industrial Technology Research Institute of Taiwan, at the time of the announcement twelve Taiwanese companies including ADATA Technology, Asustek, Ben. Q, Carry Computer Eng. Co., C One Technology, DBTel, Power Digital Card Co., and Ri. CHIP had signed on to manufacture the new memory card. However, as of June 2. The card was announced to be available starting in the third quarter of 2. It was expected to save the 1. Taiwanese companies who planned to manufacture the product and related hardware up to US4.