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Code Synthesis for Timed Automata,
Authors:
Tobias Amnell
,
Elena Fersman
,
Paul Pettersson,
Hongyan Sun
,
Wang Yi
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 signicantly 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 verication. 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 modied 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-}
}