System and method for performing data retention in solid-state memory using an LRU list
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United States of America Patent
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Jan 23, 2018
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app pub date -
Sep 14, 2015
filing date -
Jun 28, 2010
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Abstract
Systems and methods for retaining data are disclosed in which refresh copy operations are performed on data stored in non-volatile solid-state memory. A controller may be configured to maintain a list of physical memory locations, the list sorted by a least recently used criterion. The controller may select a first entry from a top of the list and perform a refresh operation to copy data stored in a current physical memory location associated with the first entry to a new physical memory location, and may remove the first entry from the top of the list and add a new entry associated with the new physical memory location to a bottom of the list. The controller may repeat the select, perform, remove and add steps for a plurality of entries in the list, and the steps may be timed such that all refresh operations are performed for all of the plurality of entries within a set period of time.
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