| 摘要 |
A timer begins to measure time, when receiving an external access signal for causing a memory core to execute a read operation, and outputs, after a predetermined time, an access request signal for activating the memory core. The predetermined time has been set to a time longer than the core operation time in which the memory core performs one operation. For this reason, when the external access signal changes in a time shorter than the predetermined time, the memory core will not operate. This can prevent malfunction of the memory core and hence prevent data stored in the memory cells from being destroyed even when the external access signals are supplied at such time intervals that do not allow the memory core to perform normal operations.
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