REFRESH COMMAND CONTROL FOR A HOST SUPPORT OF A ROWHAMMER MITIGATION

摘要

A memory device with internal rowhammer mitigation is coupled to a memory controller. The memory controller or the host can support rowhammer mitigation by sending additional refresh cycles or refresh commands. In response to an additional refresh command, the memory device can perform a refresh for row hammer mitigation instead of a refresh for standard data integrity. The memory controller can track the number of activation commands sent to the memory device, and in response to a threshold number of activation commands, the memory controller sends the additional refresh command. With the additional refresh command, the storage device can refresh the potential victim rows of a potential attacker row instead of simply refreshing a row that has not been accessed for a while.