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Enhancing Simulation Accuracy through Advanced Hazard Detection in Asynchronous Circuits

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2 Author(s)
Feng Shi ; Skyworks Solutions, Inc., Irvine, CA ; Makris, Y.

A fast and accurate simulator with elaborate hazard detection capabilities is vital for asynchronous circuits, not only for the purpose of design validation through logic simulation, but even more importantly for the purpose of test validation through fault simulation. Towards this end, we developed SPIN-SIM, a logic and fault simulator built around Eichelbergerpsilas classical hazard detection method, yet extended in various ways in order to overcome its limitations. More specifically, in order to improve simulation accuracy and hazard detection, SPIN-SIM i) employs a 13-valued algebra for which it adapts Eichelbergerpsilas method, ii) maintains partial orders of causal signal transitions through relative time-stamps, and iii) unfolds time-frames judiciously to distinguish between hazards and actual transitions. Experimental results demonstrate that, at the cost of a negligible increase in computational time over Eichelbergerpsilas method, if any at all, SPIN-SIM achieves significantly more accurate logic simulation and, by extension, drastically more efficient fault simulation. Furthermore, while the proposed method was developed and is presented for the class of speed-independent circuits, it is easily extendible to various other classes of asynchronous circuits.

Published in:

Computers, IEEE Transactions on  (Volume:58 ,  Issue: 3 )

Date of Publication:

March 2009

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