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Jedec publishes new MMC V4.4 standard

Posted: 16 Apr 2009     Print Version  Bookmark and Share

Keywords:non-volatile memory  flash memory  flash memory controller  e.MMC 

JEDEC Solid State Technology Association has announced the publication of JESD84-A44 MMC Version 4.4 standard. MMC V4.4 is available for free download at

Continuing the evolution of e.MMC as an industry-leading memory technology, the new standard offers designers numerous enhancements including a doubling of the memory interface performance, flexible partition management and improved security options.

Suitable for a wide range of applications in consumer electronics, navigational systems and other industrial uses since its publication in late 2006, e.MMC is an embedded non-volatile memory system, comprising both flash memory and a flash memory controller, which simplifies the application interface design and frees the host processor from low-level flash memory management. This benefits product developers by simplifying the non-volatile memory interface design and qualification process – resulting in a reduction in time-to-market as well as facilitating support for future flash device offerings. Small BGA package sizes and low power consumption make e.MMC a viable solution for mobile and other space-constrained products.

The new MMC V4.4 standard features a doubling of the memory interface performance over the previous standard. The maximum data transfer speed will increase from 52MB/s to 104MB/s with the adoption of a dual data rate interface, while still maintaining full backward-compatibility to legacy (single data rate) products. Also included in the new standard is the introduction of a flexible partition management system, in addition to allowing partitions to be set and operated in an enhanced performance mode, thereby offering improved performance and endurance for selective data.

"As devices continue to require support for increasing amounts of mass storage memory, JEDEC is pleased to help address the storage demands of the market with the new MMC V4.4 standard, which offers immediate benefits to system designers and end users," said Mian Quddus, Chairman, JEDEC Board of Directors.

Several key security enhancements are provided in the new standard, including increased write protection management, introduction of a secure access-controlled memory block and secure erase and trim for secure data erase operations. Various usage models can now be supported with both permanent and temporary write protection methods, allowing write protection to be selectively applied to user data as well as boot areas. The introduction of a Replay Protected Memory Block (RPMB) allows for a portion of memory to be accessed with a hidden security key, providing secure storage for the host to protect crucial programs or data, as well as enable copy protection. The new Secure Erase & Secure Trim operation provides a means of ensuring that stored data is physically erased from memory, thereby preventing subsequent retrieval of the information.

Backward compatible to earlier e.MMC versions, the MMC V 4.4 standard offers a multitude of benefits to product developers, while continuing to provide a simplified non-volatile memory interface in a comprehensive non-volatile memory solution.

For technical article on memory systems, visit Embedded Design India.

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