Multi-purpose non-volatile memory card
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United States of America Patent
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Jun 26, 2007
Grant Date -
Jan 13, 2005
app pub date -
Jul 6, 2004
filing date -
Sep 17, 2001
priority date (Note) -
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Abstract
A flash non-volatile memory system that normally operates its memory cells in multiple storage states is provided with the ability to operate some selected or all of its memory cell blocks in two states instead. The two states are selected to be the furthest separated of the multiple states, thereby providing an increased margin during two state operation. This allows faster programming and a longer operational life of the memory cells being operated in two states when it is more desirable to have these advantages than the increased density of data storage that multi-state operation provides. An exemplary embodiment is as a memory card where the user can choice between two state and multi-state operation.
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