Disclosed is a semiconductor memory device configured to delay an input signal in accordance with a clock signal having a clock period. The semiconductor memory device comprises a reference signal generator and a delay circuit. The reference signal generator configured to generate a reference signal in accordance with the clock signal. The reference signal indicates a reference delay time representing the clock period. The delay circuit configured to delay input signal for a delay time to generate a delayed signal in accordance with the reference signal. The delay time is obtainable by multiplying the reference delay time by a positive integer.

 
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