MISR architectures to remove unknown values in output response compaction

Abstract

MISR architectures are proposed to remove the unknown (X) values in the output sequences. The MISR signature is represented as a system of linear equations in terms of unknown's (X). The method of symbolic simulation is used to represent each bit of the MISR signature. The combination of linear equations of the MISR signature bits is determined with Gauss-Jordan Elimination algorithm to remove unknown values in the output responses. These X-cancelled combinations are then computed in a separate storage register to provide X-free combinations values. Experimental result describes that maximum error coverage and test time can be obtained with the help of theses MISR architectures.