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Trade-offs between Instantaneous and Total Capacity in Multi-Cell Flash Memories

En Gad, Eyal and Jiang, Anxiao (Andrew) and Bruck, Jehoshua (2012) Trade-offs between Instantaneous and Total Capacity in Multi-Cell Flash Memories. In: 2012 IEEE International Symposium on Information Theory Proceedings (ISIT). IEEE International Symposium on Information Theory Proceedings. IEEE , Piscataway, NJ, pp. 990-994. ISBN 978-1-4673-2580-6.

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The limited endurance of flash memories is a major design concern for enterprise storage systems. We propose a method to increase it by using relative (as opposed to fixed) cell levels and by representing the information with Write Asymmetric Memory (WAM) codes. Overall, our new method enables faster writes, improved reliability as well as improved endurance by allowing multiple writes between block erasures. We study the capacity of the new WAM codes with relative levels, where the information is represented by multiset permutations induced by the charge levels, and show that it achieves the capacity of any other WAM codes with the same number of writes. Specifically, we prove that it has the potential to double the total capacity of the memory. Since capacity can be achieved only with cells that have a large number of levels, we propose a new architecture that consists of multi-cells — each an aggregation of a number of floating gate transistors.

Item Type:Book Section
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Bruck, Jehoshua0000-0001-8474-0812
Additional Information:© 2012 IEEE. Date of Current Version: 27 August 2012. This work was partially supported by an NSF grant ECCS-0801795 and a BSF grant 2010075. The author would like to acknowledge that Qing Li from Texas A&M University derived Lemmas 1 and 2 independently.
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Binational Science Foundation (BSF)2010075
Series Name:IEEE International Symposium on Information Theory Proceedings
Record Number:CaltechAUTHORS:20120828-151832251
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Official Citation:Gad, Eyal En; (Andrew) Jiang, Anxiao; Bruck, Jehoshua; , "Trade-offs between instantaneous and total capacity in multi-cell flash memories," Information Theory Proceedings (ISIT), 2012 IEEE International Symposium on , vol., no., pp.990-994, 1-6 July 2012 doi: 10.1109/ISIT.2012.6284712 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33627
Deposited By: Ruth Sustaita
Deposited On:29 Aug 2012 17:01
Last Modified:22 Nov 2019 09:58

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