Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2007-02-13
2009-11-17
Nguyen, Than (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S156000, C711S206000
Reexamination Certificate
active
07620769
ABSTRACT:
A sliding window of flash blocks is used to reduce wasted space occupied by stale data in a flash memory. The sliding window slides downward over a few flash blocks. The oldest block is examined for valid pages of data, and the valid pages are copied to the end of the sliding window so that the first block has only stale pages. The first block can then be erased and eventually re-used. A RAM usage table contains valid bits for pages in each block in the sliding window. A page's valid bit is changed from an erased, unwritten state to a valid state when data is written to the page. Later, when new host data replaces that data, the old page's valid bit is set to the stale state. A RAM stale-flags table keeps track of pages that are full of stale pages.
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Lee Charles C.
Ma Abraham C.
Shen Ming-Shiang
Yu Frank
Auvinen Stuart T.
g Patent LLC
Nguyen Than
Super Talent Electronics Inc.
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