Diagnosis of Multiple Physical Defects Using Logic Fault Models

In this work, we propose a method to improve diagnosis results when multiple physical defects are present in circuits under diagnosis. To improve diagnosis results when multiple defects are present in a circuit under diagnosis, the proposed method includes (i) analyzing relations among locations of logic faults and their diagnostic metrics to carefully derive physical faults, (ii) a new set covering procedure and (iii) a method to assign scores to faults to derive candidate sets of faults. Experimental results on several industrial designs and several cases of silicon defects show the effectiveness of the proposed diagnosis method.