$X$-Canceling MISR Architectures for Output Response Compaction With Unknown Values
Joon-Sung Yang, Nur A. Touba · IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems · 2012
In this paper, anX-tolerant multiple-input signature register (MISR) compaction methodology that compacts output responses containing unknownXvalues is described. Each bit of the MISR signature is expressed as a linear combination in terms ofXs by symbolic simulation. Linearly dependent combinations of the signature bits are identified with Gaussian elimination and XORed to removeXvalues and yield deterministic values. TwoX-canceling MISR architectures are proposed and analyzed with industrial designs. This paper also shows the correlation between the estimated result based on idealized modeling and the actual data for real circuits for error coverage, hardware overhead, and other metrics. Experimental results indicate that high error coverage can be achieved withX-canceling MISR configurations and it highly correlates with actual results.