Patent ID: 7124339

Claim:
A scan path circuit constituted by a plurality of flip-flops which is operated as a shift register in a separate mode from a normal mode, each of the flip-flops comprising: a first input circuit which is selected in the normal mode and data is input in a predetermined timing in the normal mode; a second input circuit which is selected in the separate mode which is different from the normal mode and data is input in a predetermined timing in the separate mode; and an output circuit for outputting predetermined data corresponding to the data input to the first input circuit or the second input circuit, wherein the first input circuit and the second input circuit have terminals to which different control signals for each mode are input, respectively, and further wherein a voltage level of a control signal input to the terminal of the second input circuit is changed in the separate mode from the normal mode, said change of said voltage level of the control signal includes a change to a voltage level between a supply voltage and a ground voltage.