Row hammer monitoring based on stored row hammer threshold value

A system comprising:

• a memory controller to send memory access commands;
• and
• a synchronous dynamic random access memory (SDRAM) device including:
• a memory array including a target row and at least one row physically adjacent to the target row, wherein the memory access commands include commands to the target row;
• a register to store a value to indicate a maximum number of accesses to the target row within a time period;
• and
• a detector to detect when a number of accesses to the target row meets or exceeds the maximum number;
• wherein the memory device is to perform a refresh of the row physically adjacent to the target row in response to the number of accesses to meet or exceed the maximum number.

A method comprising:

• accessing, from a register of a memory device, a maximum number that indicates a maximum number of accesses to a target row of the memory device within a time period;
• detecting with a detector at the memory device when a number of accesses to a target row meets or exceeds the maximum number;
• and
• performing a refresh of a row physically adjacent to the target row in response to the number of accesses meeting or exceeding the maximum number.