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Intel, Numonyx create breakthrough in phase-change memory.



Byline: jeevan@cpidubai.com (Staff)

Intel Corp. and Numonyx B.V. announced a breakthrough in the development of phase-change memory This article contains information about scheduled or expected .
It may contain preliminary or speculative information, and may not reflect the final specification of the product.
 that has the potential to allow developers to stack multiple layers of chips atop each other, thereby greatly increasing the density of the nonvolatile memory See non-volatile memory.  medium. <p>Calling the discovery a "milestone" in phase-change memory (PCM (1) See phase change memory.

(2) (Plug Compatible Manufacturer) An organization that makes a computer or electronic device that is compatible with an existing machine.
) development, the researchers said they have so far only been able to build a single-layer, 64Mbit chip with the potential to be stacked with other 64Mbit chips. <p>Greg Atwood, a senior technology fellow at Numonyx, said the breakthrough in stackable PCM, which is being called PCM-stackable (PCMS PCMS Purchase Card Management System
PCMS Pinon Canyon Maneuver Site (Fort Carson, CO)
PCMS Project Configuration Management System
PCMS Patient Care Management System
PCMS Passive Countermeasure System
), has the potential to create products that can replace DRAM, NOR and NAND flash See flash memory.  memory because it will have better bandwidth, greater density and a cost per gigabyte of capacity comparable with today's solid state disk (SSD See solid state disk. ) drive products. <p>"We believe it enables the possibility of combining the functionality and performance of phase-change memory with more NAND-like cost structure," Atwood said. "And, it's of particular interest given the challenges the existing non-volatile memory Refers to memory chips that hold their content without power being applied. It may refer to chips that are not changeable, such as ROMs and PROMs, or to chips that can be rewritten many times such as flash memory.  technologies are facing over the next decade as well as the continued expansion of [PCM] usage." <p>The two companies have been working on development of PCM products since 2000, and a stackable PCM product since 2002. Al Fazio, an Intel fellow and director of memory technology development, said it's not unusual for a new memory type to take as many as 10 years to develop. <p>Atwood said that because the stacking breakthrough builds on top of PCM, a technology already in production, "it's a leading candidate amongst the various stackable memory concepts, most of which have no basis in a proven technology." <p>Other non-volatile memories in development include graphite memory , and race track memory . <p>Atwood added that Intel and Numonyx have no current time line for bringing PCMS products to market.<p>Phase-change memory is made up of a glass-like material called chalcogenide that can be can be switched between a crystalline and random state using very low-voltage electricity. <p>Current NAND flash memory lithography technology resides at the 32-nanometer level. Future roadmaps scale NAND flash to 20 nanometers, but physical limitations present a barrier to creating anything more dense than that. <p>PCM, however, currently has the ability to scale to 5 nanometers in size, and the potential of even greater densities, Fazio said. <p>The structure of a typical non-volatile memory cell includes a storage element combined with a selector element. The function of the storage element is nonvolatile storage Noun 1. nonvolatile storage - computer storage that is not lost when the power is turned off
non-volatile storage

flash memory - nonvolatile storage that can be electrically erased and programmed anew
 of data and the purpose of the selector element is to connect storage elements into a cross-point array of cells. The connection allows for the selection of a single storage element inside of a large array of cells -- a billion or more. <p>Unlike NAND flash memory, which requires a entire block of memory cells to be rewritten each time new data is stored on a device like a SSD drive, PCM allows for single bits to be changed, greatly increasing the efficiency and performance of a device. <p>"It has features of a low-latency memory and high bandwidth so we can combine many of the good attributes ... of NAND flash, DRAM and NOR flash," Fazio said. <p>The breakthrough in stacking PCMS came with the use of a thin film selector substance that is in the same class of materials as chalcogenide and is built above the silicon substrate. The companies are calling the thin film selector an Ovonic o·von·ic  
adj.
Of or relating to a device whose operation is based on the Ovshinsky effect.



[Ov(shinsky effect) + (electr)onic.]
 Threshold Switch (OTS See Office of Thrift Supervision. ), which acts like a resister between the stacked layers of PCM chips. <p>"This switch demonstrates a diode-like behavior. It has a low current in the off state and a high current in the on state," Atwood said. "Combining the OTS with the thin film storage material, a similar material used in phase-change memories today, enables a cell that can be stacked multiple layers high." Additionally, since the silicon substrate that isn't being used as a selector, as it is in today's PCM product, can now be used for building the support circuitry used that's required to decode, read and write to the cells. <p>"So the combination of these two advantages results in a much smaller die size that's a lower potential cost structure for the memory," Atwood said. <p>On Dec. 9, the two companies plan to present a paper on their discovery at the 2009 International Electron Devices Meeting The International Electron Devices Meeting is an annual conference held alternatively in San Francisco, California and Washington D.C. Established in 1954, IEDM is the world's main forum on advancement in semiconductor and electronic devices. , titled "A Stackable Cross Point Phase Change Memory."<p>Copyright 2009 IDG IDG International Data Group
IDG Integrated Drive Generator
IDG Installation Design Guide
IDG Internet Discussion Group
IDG Inset Dielectric Guide
IDG International Dangerous Goods (mail, shipping) 
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Publication:Network World Middle East
Date:Oct 29, 2009
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