| 摘要 |
A memory capable of performing a refresh operation uncompetitively with an internal access operation also when an external access operation is non-cyclically performed is obtained. This memory comprises an external access detection portion detecting an external access operation, an access control portion performing an internal access operation on the basis of the external access operation and a refresh determination portion determining whether or not to perform a refresh operation on the basis of detection of the external access operation by the external access detection portion and the operating state of the access control portion. The access control portion performs the refresh operation before or after the internal access operation on the basis of the result of determination of the refresh determination portion.
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