Patent ID: 7209849

Claim:
A test system that tests a device under test, comprising: an event data acquiring section that acquires event data including a plurality of sets of a change timing and a signal value after the change for each of a device input signal input into the device under test and a device output signal output from the device under test, which are obtained by a logic simulation for the device under test; a signal generating section that generates the device input signal to be supplied to the device under test based on the input event including the change timing and the signal value after the change for the device input signal, which are included in the event data; a signal supplying section that supplies the generated device input signal to the device under test; a signal input section that inputs the device output signal output from the device under test according to the device input signal; a change detecting section that detects whether the input device output signal has been changed or not; a change timing detecting section that detects the change timing for the device output signal; a storing section that sequentially stores the change timing and the signal value after the change for the device output signal as an output event, according to the fact that the device output signal has been changed; a reading section that sequentially reads the output event from said storing section; and a quality deciding section that checks an event, which includes the change timing and the signal value after the change for the device output signal to be output from the device under test and is obtained by a logic simulation for the device under test, as an expected value event with the read output event, in order to decide whether the device output signal is identical with the expected value or not.