| 摘要 |
The technique of the present invention sets a time period of a level H between a rise and a fall of an ATD signal (that is, a pulse width of the ATD signal) to be not shorter than a preset allowable address skew range and not longer than a time period between a timing of a rise of the ATD signal, at which the refreshing operation starts, and conclusion of the refreshing operation. This arrangement ensures generation of an appropriate ATD signal even when an address skew occurs in an externally given address.
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