ROW HAMMER MONITORING BASED ON STORED ROW HAMMER THRESHOLD VALUE

摘要

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.

主权项

1. A memory subsystem comprising:
a memory device having multiple physical rows of memory cells; and detection logic coupled to the memory device, the detection logic to
obtain an access rate threshold for the memory device from a register that stores configuration information for the memory device, the threshold identifying a number of accesses to a specific row of memory within a time window that causes risk of data corruption on a row physically adjacent to the accessed row;determine based on the threshold whether a number of accesses to one of the multiple physical rows of the memory device exceeds the threshold; andin response to detecting that the number of accesses exceeds the threshold, trigger the memory device to perform a refresh targeted to a victim row physically adjacent to the row for which the number of accesses exceeded the threshold.