System and method for wear leveling utilizing a relative...

Details System and method for wear leveling utilizing a relative... System and method for wear leveling utilizing a relative...

2011-01-25

2011-01-25

Tran, Andrew Q (Department: 2824)

Static information storage and retrieval

Floating gate

Particular connection

C365S185110, C365S185290, C365S185020

Reexamination Certificate

active

07876616

ABSTRACT:
An invention is provided for wear leveling in a non-volatile memory system utilizing relative wear counters to indicate relative levels of wear for each memory block in a non-volatile memory system. Whenever a memory block is erased, the associated relative wear counter is incremented. Then, when any relative wear counter reaches a predetermined limit, the value of the lowest relative wear counter is subtracted from each relative wear counter. Thus, each relative wear counter indicates a relative wear level of the associated memory block relative to other memory blocks. In this manner, the relative wear levels are maintained while reducing the amount of memory needed to for each relative wear counter.

REFERENCES:
patent: 7068553 (2006-06-01), Lee
patent: 7480760 (2009-01-01), Bernstein et al.
patent: 2005/0073884 (2005-04-01), Gonzalez et al.
patent: 2006/0098484 (2006-05-01), Roohparvar

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