Row hammer refresh command
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United States of America Patent
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Aug 25, 2015
Grant Date -
Feb 27, 2014
app pub date -
Oct 31, 2013
filing date -
Jun 30, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A memory controller issues a targeted refresh command. A specific row of a memory device can be the target of repeated accesses. When the row is accessed repeatedly within a time threshold (also referred to as “hammered” or a “row hammer event”), physically adjacent row (a “victim” row) may experience data corruption. The memory controller receives an indication of a row hammer event, identifies the row associated with the row hammer event, and sends one or more commands to the memory device to cause the memory device to perform a targeted refresh that will refresh the victim row.
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