Static information storage and retrieval – Floating gate – Particular biasing
Reexamination Certificate
2008-07-08
2008-07-08
Lam, David (Department: 2827)
Static information storage and retrieval
Floating gate
Particular biasing
C365S236000, C365S189070, C365S185110
Reexamination Certificate
active
07397707
ABSTRACT:
A non-volatile flash memory system counts the occurrences of an event, such as the number of times that individual blocks have been erased and rewritten, by updating a compressed count only once for the occurrence of a large number of such events. Complementary embodiments include updating the compressed count based upon a random number or upon the actual count matching a multiple of the fixed number. These techniques also have application to monitoring other types of recurring events in flash memory systems or in other types of electronic systems. In another aspect of the present invention, provisions are made to maintain an accurate experience count if the memory system experiences an improper shutdown, for example in case of power loss or removal of a memory card.
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Davis , Wright, Tremaine, LLP
Lam David
SanDisk Corporation
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