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Monday, June 25, 2012
JEDEC Updates The UFS Standard


JEDEC's UFS flash memory standard matures, offering faster performance and lower power consumption for Mmobile devices such as tablets and smartphones.

JEDEC Solid State Technology Association has released key updates to its Universal Flash Storage (UFS) standard. Specifically tailored for mobile applications and computing systems requiring high performance and low power consumption, the new UFS v1.1 standard is an update to the v1.0 standard published in 2011. JESD220A Universal Flash Storage v1.1 contains amendments and references to the latest related MIPI Alliance specifications, and may be downloaded free of charge from the JEDEC website:

http://www.jedec.org/standards-documents/results/jesd220a.

JEDEC has also published a complementary standard, JESD223A UFS Host Controller Interface (HCI) v1.1. JESD223A defines a standard host controller interface on which system designers can create a common host controller software driver layer to work with UFS host controller hardware from different manufacturers. The HCI functionality also enables higher performance and power efficiency by minimizing the involvement of the host processor in the operation of the Flash storage subsystem. JESD223A Universal Flash Storage Host Controller Interface v1.1 may also be downloaded here:

http://www.jedec.org/standards-documents/results/jesd223a.

UFS v1.1 continues to build on JEDEC Flash memory storage standards designed to help address this demand. To allow for easy transition from e·MMC technology, UFS v1.1 has implemented functionality that are compatible with e·MMC v4.51 command protocol improvements such as Context ID (grouping different memory transactions under a single ID so the device can understand that they are related), and Data Tag (tagging specific write transactions so they can be prioritized and targeted to a memory region with higher performance and better reliability).

To achieve the highest performance and most power efficient data transport, JEDEC UFS aligns with specifications from the MIPI Alliance to form its Interconnect Layer. This collaboration continues with UFS v1.1, which supports the M-PHY and UniProSM specifications. Recently published, the newest UniPro specification defines a universal chip-to-chip data transport protocol, providing a common tunnel for higher-level protocols. The updated M-PHY interface is designed as the primary physical interface (PHY layer) for the UniPro specification, and is a high speed serial interface. The next generation M-PHY reaches 2.9 gigabits per second (Gbps) per lane with up-scalability to 5.8Gbps per lane.

First published in February 2011, UFS is designed to be the most advanced specification for both embedded and removable Flash memory-based storage in mobile devices such as smartphones and tablets. The initial data throughput for UFS is 300 megabytes per second (MB/s) over the bus in both uplink and downlink directions simultaneously, without infringing on bandwidth needed for other applications. UFS offers a low active power level and a near-zero idle power level, which, combined with the power-saving attributes of the related MIPI specifications, allows for significant reductions in device power consumption. The UFS standard adopts the SCSI Architecture Model and command protocols supporting multiple commands with command queuing features and enabling a multi-thread programming paradigm. This differs from conventional Flash-based memory cards and embedded Flash solutions which process one command at a time, limiting random read/write access performance.


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