Patent ID: 6097228
Filing Date: 2000-08-01
Classification: G06F

Abstract:
A semiconductor integrated circuit device comprising:noise filter means for eliminating a noise with a pulse width shorter than an effective pulse width from an input signal;sampling means for sequentially sampling an output signal of said noise filter means;effective pulse width detection means for receiving an output signal of said sampling means and determining whether or not the input signal has an effective pulse width, wherein said effective pulse width detection means determines whether or not the pulse width of the input signal sampled by said sampling means reaches a preset number of pulses of a clock signal and outputs a detection signal when it is detected that the preset number of pulses is reached; andwaveform forming means for receiving an output signal of said effective pulse width detection means and forming an internal signal with a necessary pulse width based on the input signal when it is detected that the input signal has the effective pulse width.