Abstract
A new method for grouping of relevant and equivalent inputs of a logical circuit is proposed by making use of input-output correlation function. Pseudorandom M-sequences are applied to a logical circuit and their outputs are observed. The crosscorrelation function between the input and output gives us the information on the logical circuit whether it is faulty or not. The authors show that it is possible to classify the faults by use of this grouping method. The authors also show an example of fault estimation by this method, indicating further application of this method.
