An autocorrelation trigger comprising a correlator detector for producing a correlation coefficient by correlating a signal with a time-delayed version of the signal and generating a trigger in real-time when the correlation coefficient corresponds to a predetermined condition is provided. The device can rapidly dissipate heat generated by an IC during operation since a heat radiator is disposed on one end of the chassis base corresponding to the IC of the flexible printed cable. The first connecting member has first implement connecting devices and the second connecting member has second implement connecting devices. A third and a fourth line plane are spatially separated and electrically isolated from the first and second line planes and are occupied by write selection lines for writing a cell information item. If the LBIST design-for-test logic does not function correctly, the logical built-in self-test is terminated. The degradation of the potentiometer in performance of the plurality of evaluation items is evaluated in terms of stages, in a specific sequence.