Method of erasing a flash memory
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United States of America Patent
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Dec 8, 1998
filing date -
Dec 10, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
This invention discloses a method of erasing a flash memory, in which the method comprises: (A) erasing all cells of a selected sector; (B) verifying in cells whether the cells are erased; (C) saving an address corresponding to a non-erased cell and re-erasing the cells when the non-erased cell is detected by the step (B); (D) verifying in cells, from the saved address to the final address whether the cells are erased; and (E) executing a slight-program for recovering over-erased cells so that the cells of the sector are normally erased.
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