DRAM FOR SELECTIVELY OPERATING RESPONSIVE TO AUTO-REFRESH COMMAND, MEMORY FOR CONTROLLING AUTO-REFRESH OPERATION THEREOF, MEMORY SYSTEM INCLUDING THE DRAM AND MEMORY, AND OPERATING METHODS THEREOF

摘要

The method involves activating an auto-refresh mode of a volatile memory device in response to an auto-refresh mode activation command. An auto-refresh operation is performed on a set of memory cells in response to an auto-refresh command. The auto-refresh mode activation command and the auto-refresh command are received from another memory device. An occupation request is send from the latter device to a host device. Independent claims are also included for the following: (A) a memory system comprising a dynamic random access memory device that includes a memory cell array and a circuit that initiates an auto-refresh operation on memory cells of the memory cell array (B) a method for operating a memory system.