| 摘要 |
PURPOSE:To improve a testing efficiency by equalizing the output values of target FFs to the same value when an overdelay and a racing occur between a source FF to be tested and the target FF. CONSTITUTION:A test pattern 4 in which an input of a source FF 1 is inverted from a first clock to a second clock and the output of the source FF 1 is inverted by the fist clock, is used. If the output value of a target FF 2 after a second clock coincides with an expected value set by the pattern 4, i.e., the output value when the target F 2 is correctly operated, decisions in which no overdelay occurs between the source FF 1 and the target FF 2 and further no racing occurs are performed once, thereby enhancing the testing efficiency of the overdelay test. |
