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AssigneeFujitsu Limited
InventorsMasami Nakashima, Mitsuhiro Higashiho
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There are provided a semiconductor memory device and a refresh control method thereof to realize a refresh operation without any problem for external accesses while realizing low current dissipation operations for executing the refresh operation in separation from external access operation, in which the refresh operation is inhibited during execution of the external accesses. During this period, the internal operation in the refresh operation is controlled for the first refresh-operation-start request, but the internal operation for the second and subsequent refresh operation start requests is inhibited. Even when a plurality of refresh-operation-start requests are outputted previously while the refresh operation is inhibited during the external access operation, only the internal operation is not executed previously and the refresh operations after completion of the external access operation can surely be executed.
A refresh control method of semiconductor memory device comprising an external access operation executed based on an external request and a refresh operation executed internally and automatically,
A refresh control method of semiconductor memory device comprising an external access operation executed based on an external request and a refresh operation executed internally and automatically,
A semiconductor memory device executing an external access operation based on an external request and a refresh operation which is conducted therein automatically, comprising:
A semiconductor memory device executing an external access operation based on an external request and a refresh operation which is conducted therein automatically, comprising:
Dependencies are inferred from the claim text.