未来内存技术谁最主流?IBM说是PCM

上网时间: 2014年05月27日? 作者:R. Colin Johnson? 我来评论 【字号: ? ?小】

关键字:相变化内存? 未来主流内存? PCM?

IBM Hawks PCM for Storage

R. Colin Johnson

PORTLAND, Ore. -- IBM recently demonstrated how to integrate phase change memory (PCM) into a solid-state memory hierarchy, and it has shown its first PCIe-based prototype board for storage systems. It's looking like speed and the ancient Greek heroes are on PCM's side.

In a presentation at the 2014 Non-Volatile Memory Workshop, IBM described its architecture, compared it to flash-based solid-state drives (SSDs), and proposed a server system that eliminated the hard-disk drive (HDD) in favor of a memory hierarchy using both flash-based arrays and PCM-based arrays. In comparisons, the PCM-based arrays handily beat flash.

Ioannis Koltsidas, an IBM storage systems research staff member, shows his prototype board that outperforms flash alone by adding

phase change memory (PCM).

(Source: IBM)

"The comparison was between flash SSD and our PCM PCIe card -- it was a comparison at the system level of the two storage devices," Ioannis Koltsidas, a member of the IBM storage systems research staff, told EE Times. Working with the University of Patras in Greece, which helped name the card Theseus after a hero in Greek mythology, the researchers compared the PCM-based PCIe card with two flash SSDs -- an enterprise-grade flash SSD and a consumer-grade flash SSD. "We found the times for the two flash SSDs to be 12x and 275x longer than for the PCM PCI-e card."

Though PCM memory chips have been around since 2012, there have been very few deployments and quite a few complaints about reliability. Nevertheless, IBM appears to be gung ho about the possibilities of PCM-based memories, one would assume, after the bugs are worked out.

PCM (blue) can fit into many slots in the memory hierarchy for servers and storage systems, according to IBM.

The biggest advantage of PCM over flash is that its performance is higher than flash, though not as high as DRAM, plus it enjoys the nonvolatility of flash. Also, PCM normalized input/output (I/O) throughput is on the rise at a time when HDD I/O operations per second are waning. Today flash is filling the gap, but PCM could take over that job. Flash is also facing scalability problems and can only be rewritten about 10,000 times at the most. PCM's scalability is on the rise, and it can be rewritten at least 10 million times -- or, with forward error correction, at least 10 trillion times.

PCM uses a chalcogenidic alloy sandwiched between two electrodes. A high current turns the chalcogenidic alloy amorphous (representing a 0), whereas a medium current turns it crystalline (representing a 1), and a low current allows its state to be read out. Programming times for 0s and 1s are 70 nanoseconds and 120 nanoseconds, respectively. IBM's tests used PCM memories fabricated at a relaxed feature size of 90 nanometers and a clock frequency of 66 megaHertz.

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  • PCM是什么意思
  • PCM是Phase-change memory的简称,中文意思是相变存储器。PCM是由IBM公司的研究机构所开发的一种新型存储芯片,将有望来替代如今的闪存Flash和硬盘驱动器HDD

  • 什么是未来主流内存?
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  • 什么是相变化内存?
  • 国际电子商情提供相关相变化内存技术文章及相关相变化内存新闻趋势,及更新最新相关相变化内存电子产品技术

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