| 摘要 |
A semiconductor device, includes a plurality of scan chains for testing a plurality of clock domains whose operating frequencies are different from one another, each of the plurality of scan chains including a plurality of flip-flop circuits, a clock oscillator which generates a plurality of clock signals corresponding to respective operating frequencies that are used to test the plurality of clock domains, a scan clock signal input circuit which receives, from an outside, and a scan clock signal that is supplied to the plurality of scan chains. The semiconductor device further includes a pulse generation circuit unit which generates a clock pulse signal used for the testing based on the clock signal and the scan clock signal, the pulse generation circuit unit including a plurality of pulse generation circuits corresponding to respective operating frequencies, a clock control circuit unit which selectively activates a part of the pulse generation circuit in the pulse generation circuit unit, the clock control circuit including a plurality of logic circuits corresponding to the plurality of scan chains, respectively, and a clock control signal generation unit which generates a clock control signal to control the clock control circuit unit, based on the scan clock signal.
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