Partial block data programming and reading operations in a non-volatile memory
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United States of America Patent
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Nov 20, 2012
Grant Date -
Oct 20, 2011
app pub date -
Jun 24, 2011
filing date -
Jan 19, 2001
priority date (Note) -
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Abstract
Data in less than all of the pages of a non-volatile memory block are updated by programming the new data in unused pages of either the same or another block. In order to prevent having to copy unchanged pages of data into the new block, or to program flags into superceded pages of data, the pages of new data are identified by the same logical address as the pages of data which they superceded and a time stamp is added to note when each page was written. When reading the data, the most recent pages of data are used and the older superceded pages of data are ignored. This technique is also applied to metablocks that include one block from each of several different units of a memory array, by directing all page updates to a single unused block in one of the units.
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