Patent ID: 8067962

Claim:
A semiconductor integrated circuit device comprising: a first synchronization circuit to which a first clock signal is input and which outputs a control signal in synchronization with the first clock signal; a second synchronization circuit to which a second clock signal is input and to which an input signal is input from an external point, the second synchronization circuit outputting the input signal in synchronization with the second clock signal; a logic circuit to which the input signal is input from the second synchronization circuit and which performs a logical operation based on the input signal; a switching circuit connected to the logic circuit, and wherein, in accordance with the control signal, the switching circuit switches an output of the logic circuit to a high level, or the switching circuit stops the logical operation of the logic circuit, wherein the result of the logical operation of the logic circuit is further subjected to a further logical operation so as to generate a first output signal, and the semiconductor integrated circuit device further comprises a third synchronization circuit which outputs the first output signal in synchronization with a third clock signal.