Power management control and controlling memory refresh operations
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United States of America Patent
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Sep 1, 2009
Grant Date -
Sep 15, 2005
app pub date -
Mar 10, 2004
filing date -
Mar 10, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A memory devices provide signals indicating when refresh operations are complete. The signals from a number of memory devices can be combined, such as by Oring, to provide a refresh complete signal to a power management controller. Dynamic factors can affect the refresh operation and the memory may be refreshed without restoring the entire system to a high power state. The time required to perform a refresh operation can be determined dynamically, allowing the system to be returned to a low power state as soon as refresh is complete. Ambient temperatures can be monitored to dynamically determine when to perform a refresh operation.
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