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Computing observability don't cares efficiently through polarization

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3 Author(s)
H. Arts ; Ambit Design Syst. Inc., Santa Clara, CA, USA ; M. Berkelaar ; K. Van Eijk

A new method is presented to compute the exact observability don't cares (ODCs) for multiple-level combinational circuits. A new mathematical concept, called polarization, is introduced. Polarization captures the essence of ODC calculation on the otherwise difficult points of reconvergence. It makes it possible to derive the ODC of a node from the ODCs of its fanouts with a very simple formula. Experimental results for the 39 largest MCNC benchmark examples show that the method is able to compute the ODC set (expressed as a Boolean network) for all but one circuit in at most a few seconds

Published in:

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems  (Volume:17 ,  Issue: 7 )