Perfect row hammer tracking with multiple count increments

Abstract

A memory device can internally track row address activates for perfect row hammer tracking, incrementing an activate count for each row when an access command is received for a row. Instead of incrementing the count for each activate, the memory controller can indicate a number greater than one for the memory device to increment the count, and then indicate not to increment the count for subsequent accesses up to the number indicated. The memory controller can determine whether the row address of an activate command is one of N recent row addresses that received the access command. The memory controller can indicate an increment of zero if the row address is one of the N recent addresses, and indicate an increment of a number higher than one if the row address is not one of the N recent addresses.