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KB3001
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re: CTO confirms IBM's PCM expectations
KB3001   12/8/2010 3:51:15 PM
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Would not 3D allow for an extra degree of feedom for isolation?

docdivakar
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re: CTO confirms IBM's PCM expectations
docdivakar   12/7/2010 4:33:27 AM
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@Charles.Desassure: I agree, I did not find anything that we don't know already about PCM & PRAMs available in public domain. The thermal cross talk is a problem in both 2D and 3D applications, the latter being the worse. The thermal coupling through the substrate between junctions. Thinning the substrates and insulating layers may mitigate this to some extent but that is a change for the worse in 3D stacking. @iniewski: I hear you, I don't see how PCM can scale better than flash; heating chalcogenide will put space restrictions on scaling. The alternative is worse, if switching rates are needed less than 5ns, there is a real possibility of thermal avalanche mode with scaling. If IBM is 3 to 5 years away from commercializing this technology, they sure have their work cut out for them. Samsung may beat them to the punch! Dr. MP Divakar

greenpattern
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re: CTO confirms IBM's PCM expectations
greenpattern   12/4/2010 2:31:47 AM
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It's an interesting question. The crosstalk can be considered just from two adjacent pillars/stacks (same plane), with one having current through it. But I agree that 3D stacking (is that what you mean?) potentially could be more severe.

greenpattern
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re: CTO confirms IBM's PCM expectations
greenpattern   12/1/2010 8:36:42 PM
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I suspect same type of crosstalk effect occurs for charge stored on neighboring floating gate in flash.

greenpattern
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re: CTO confirms IBM's PCM expectations
greenpattern   12/1/2010 8:12:28 PM
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The trouble with PCM and MRAM cells is that when they are too close together there is the crosstalk from heating or magnetic field when writing is performed.

resistion
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re: CTO confirms IBM's PCM expectations
resistion   12/1/2010 12:56:49 AM
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They can't be serious about both pcm and racetrack as pcm replacement!

Charles.Desassure
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re: CTO confirms IBM's PCM expectations
Charles.Desassure   12/1/2010 12:03:51 AM
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Thanks for this article. I have read this article over and over again and I am still wondering why Peter Clarke interviewed Jai Menon? Jai Menon is not saying anything that we don’t already know. We know that IBM is working on different projects. We need to ask IBM hard-hitting questions so we can know what they are during and where they are going? When a company is talking about three to five years on a project, to me; that sounds like you have more research to do and that is not "very bullish". But I am happy that Jai Menon is working on this exciting project.

krisi
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re: CTO confirms IBM's PCM expectations
krisi   11/29/2010 7:14:38 PM
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I remain being skeptical here, I just don't see PCM scaling better than flash...working in a semiconductor industry for several years I have seen hundreds of cases when the company publicly talks about one technology but quietly pursues something different internally...Kris

Volatile Memory
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re: CTO confirms IBM's PCM expectations
Volatile Memory   11/29/2010 2:38:57 PM
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Interesting. So it took 10 years for Micron to publicly admit in 2004 that PCM does not scale, after having signed an exclusive, royalty-bearing license to the phase-change memory patents in 1994. Then it took 10 years for Intel/STM/Numomyx to admit that PCM does not scale (a tacit admission, by failure to deliver the promised 45-nm chip in the beginning of this year). Samsung, having failed to produce the promised cell phone with phase-change memory by June 30 this year, should be next. So, when will IBM admit that PCM does not scale? Looks like, in 2015, 10 years after that ill-fated "joint research initiative to explore the potential of a new form of computer memory technology called phase-change memory." You can't make this up. And somebody at IBM is DEFINITELY not doing his/her job.

Peter Clarke
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Blogger
re: CTO confirms IBM's PCM expectations
Peter Clarke   11/29/2010 12:45:20 PM
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Mainly because I was asking Jai Menon about phase-change memory in the light of his recent reported comments (see foot of article). Menon did say that IBM thinks magnetic "race-track" memory could be successfully a bit further out.

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