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Verification of speed-dependences in single-rail handshake circuits

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2 Author(s)
Negulescu, R. ; Waterloo Univ., Ont., Canada ; Peeters, A.

A way to reduce the cost (area) or increase the performance of asynchronous circuits is to make timing assumptions that go beyond the isochronic fork. This, however, results in circuits that are not speed-independent. Such timing assumptions often boil down to imposing that, of two circuit paths that start at the same point, one path is faster than the other. We call speed-dependences of this form chain constraints, and we handle them as processes in a metric-free formalism. This paper applies chain constraints to verify single-rail handshake circuits in the context of their timing assumptions, and to evaluate safety margins for delay fluctuations. We discuss the lessons learned, including decomposition and weakening of extended isochronic fork assumptions, usage of CMOS cell models in the presence of hazards, and correlations between our discrete-state results and analog simulations

Published in:

Advanced Research in Asynchronous Circuits and Systems, 1998. Proceedings. 1998 Fourth International Symposium on

Date of Conference:

30 Mar-2 Apr 1998

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