MMC specification version 4.0 is launched

Published:2011/7/25 2:44:00 Author:Amy From:SeekIC

MultiMediaC­ard Association (MMCA) recently introduced version 4.0 of the MultiMediaC­ard. Its specification features wider bus width, dual voltage opera­tion and the highest transfer speeds. MMCA is a stan­dards organization that pro­motes the worldwide adoption of MultiMedioCards (MMCs).

The new feature-rich version 4.0 specification can be a major expansion of the MultiMediaC­ard standard, going to new lev­els of sophistication and market­ing opportunities to the digital imaging and mobile phone industries.

In order to make sure smooth transition from previous versions of the MMC standards, this new specification defines backward compatibility paths for legacy cards and host devices which accept MultiMe­dioCards. The specification is offered to all MMCA members. Three key features of the new specification are:
Wider bus-width: The new multi­ple (xl bit, x4 bit and x8 bit) bus-width allows for host design flexibility and higher data transfer bandwidth at a given clock speed, to accommo­date the more data intensive content in cell phones and digi­tal cameras.

Higher clock frequency: Extend­ing the maximum clock frequen­cies from 20 MHz to 26 MHz and 52 MHz allows higher data transfer rate and better compat­ibility to mobile phone architec­tural requirements. Operating at 52 MHz in x8 bit mode, data can be transferred at up to 52 Mbyte/sec, a 20-fold improve­ment from the previous stan­dards. This is the highest data transfer rate of all flash memory card form factors available today.

Dual voltage operation: The MMC specification is the first small form factor memory card standards to define both 3.3 V and 1.8 V operations. 1.8 V compatibility is very impor­tant for the new generations of mobile phones and small mobile devices which operate at lower voltages to achieve the purpose of lower power con­sumption.

Definition of the specification is a major contributions from Nokia, Hewlett Packard, Renesas Tech­nology, Samsung Electronics, Infineon Technologies Flash, Micron Technology, SanDisk, and other member companies in the Association. It was approved and adopted by the full body of the MMCA Execu­tive Membership.

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