A waveform generating apparatus capable of outputting a desired waveform is provided. Among delay data is selected a set pulse generating delay data depending on test logical data and waveform mode information. The delay data, a skew adjusting delay data, and a fraction data in each test cycle are computed to obtain an integer delay data and a fraction delay data, which are supplied to a counter delay circuit. From the counter delay circuit are outputted a set pulse generating effective flag for delaying a test period timing by a delay time corresponding to the integer delay data, and a fraction delay data related thereto. The effective flag is delayed based on the related fraction delay data to obtain a set pulse. Similarly with the set pulse, a reset pulse is obtained, thereby to set/reset an S-R flip-flop to output a desired waveform.

 
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