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Code Synthesis for Timed Automata,

Fulltext:


Authors:

Tobias Amnell , Elena Fersman , Paul Pettersson, Hongyan Sun , Wang Yi

Research group:

Formal Modelling and Analysis of Embedded Systems

Publication Type:

Journal article

Venue:

Nordic Journal of Computing

Abstract

In this paper we present a case-study in which the tool Uppaal is extended and applied to verify an Audio-Control Protocol developed by Philips. The size of the protocol studied in this paper is signi cantly larger than case studies, including various abstract versions of the same protocol without bus-collision handling, re- ported previously in the community of real-time veri cation. We have checked that the protocol will function correctly if the timing error of its components is bound to 5%, and incorrectly if the error is 6%. In addition, using Uppaal's ability of generating diagnostic traces, we have studied an erroneous version of the proto- col actually implemented by Philips, and constructed a possible execution sequence explaining the error. During the case-study, Uppaal was extended with the notion of committed loca- tions. It allows for accurate modelling of atomic behaviours, and more importantly, it is utilised to guide the state-space exploration of the model checker to avoid explor- ing unnecessary interleavings of independent transitions. Our experimental results demonstrate considerable time and space-savings of the modi ed model checking algorithm. In fact, due to the huge time and memory-requirement, it was impossi- ble to check a simple reachability property of the protocol before the introduction of committed locations, and now it takes only seconds.

Bibtex

@article{Amnell2051,
author = {Tobias Amnell and Elena Fersman and Paul Pettersson and Hongyan Sun and Wang Yi},
title = {Code Synthesis for Timed Automata, },
volume = {9},
number = {4},
month = {May},
year = {2002},
journal = {Nordic Journal of Computing },
url = {http://www.es.mdu.se/publications/2051-}
}