Restore tracking system for DRAM
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United States of America Patent
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May 14, 2002
Grant Date -
N/A
app pub date -
Nov 19, 1998
filing date -
Nov 19, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for reducing the number of refresh actions needed to maintain data in a DRAM, by restoring only those cells which haven't been read from or written to within an allotted data retention time. One embodiment describes a restore tracking system as applied to a DRAM cache. The restore tracking system can alternatively be applied to any memory architecture having duplication of information. For example, the number of refresh actions needed to maintain data entries in a DRAM can be reduced by recording and updating a refresh status of one or more of the data entries in the DRAM; and invalidating those data entries having an expired status. Thus, more memory bandwidth can be made available to a computer system.
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