Importance

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Abstract

An external clock signal CK is input to a buffer, which generates an internal clock signal CLK having a skew of D1 with respect to the external clock signal CK. The internal clock signal is input first to a delay circuit which has a delay time A, then to a delay array which provides a delay time D2, and finally to a delay circuit which has a delay time of D2. The delay circuit generates a corrected internal clock signal CK' which is synchronous with the external clock signal CK. The delay array is composed of delay units, each having a state-holding section. The state-holding section of any delay unit that has passed a forward pulse is set in a predetermined state. Once its state-holding section is set in the predetermined state, the delay unit provides a correct delay time of 2.times..DELTA..

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First Claim