Methods for writing non-volatile memories for increased...

Details Methods for writing non-volatile memories for increased... Methods for writing non-volatile memories for increased...

2007-07-17

2007-07-17

Nguyen, Tuan T. (Department: 2824)

Static information storage and retrieval

Addressing

Counting

C365S218000

Reexamination Certificate

active

11321217

ABSTRACT:
A memory system that incorporates methods of amplifying the lifetime of a counter made up of memory elements, such as EEPROM cells, having finite endurance. A relatively small memory made up of a number of individually accessible write segments, where, depending on the embodiment, each write segment is made up of a single memory cell or a small number of cells (e.g., a byte). A count is encoded so that it is distributed across a number of fields, each associated with one of the write segments, such that as the count is incremented only a single field (or, in the single bit embodiments, occasionally more than one field) is changed and that these changes are evenly distributed across the fields. The changed field is then written to the corresponding segment, while the other write segments are unchanged. Consequently, the number of rewrites to a given write segment is decreased, and the lifetime correspondingly increased, by a factor corresponding to the number of write segments used.

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Bhat et al., “Balanced Gray Codes,”The Electronic Journal of Combinatorics, vol. 3, 1996, #R25, pp. 1-11.

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