Row hammer monitoring based on stored row hammer threshold value
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United States of America Patent
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Sep 25, 2018
Grant Date -
Dec 21, 2017
app pub date -
Jun 26, 2017
filing date -
Nov 30, 2012
priority date (Note) -
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Abstract
Detection logic of a memory subsystem obtains a threshold for a memory device that indicates a number of accesses within a time window that causes risk of data corruption on a physically adjacent row. The detection logic obtains the threshold from a register that stores configuration information for the memory device, and can be a register on the memory device itself and/or can be an entry of a configuration storage device of a memory module to which the memory device belongs. The detection logic determines whether a number of accesses to a row of the memory device exceeds the threshold. In response to detecting the number of accesses exceeds the threshold, the detection logic can generate a trigger to cause the memory device to perform a refresh targeted to a physically adjacent victim row.
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