An Object Oriented Petri Net Approach to Embedded System by Robert Esser

By Robert Esser

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The approach taken in this monograph is based on a formal object oriented kernel language and concepts from graph grammars. Graph grammar productions are defined which specify the editing rules (syntax) of a formalism. The semantics are modelled using kernel language components to represent the elements of a formalism. Multiple formalisms communicate with one another with semantics defined by the kernel language. An advantage of this approach is that tools need only consider the kernel language rather than each formalism individually, therefore only one simulator, code generator and refinement mechanism etc.

Fortunately interest now exists in not only developing new modelling languages, but also in how the use of different modelling languages can be best combined within the same system model. 2 39 Methodologies A design methodology defines the process of designing a system, typically from conception to implementation. It is usually derived from heuristics obtained over many designs and therefore provides a set of well tested design steps that, when followed, ensures that critical analysis and design aspects are not neglected.

It adds two further design abstractions to those available in ANSI C, namely block and process. A block contains an interconnection of logic and instances of other blocks and processes. A process consists of a hierarchy of procedures and functions and executes repeatedly, restarting itself upon completion, thus implementing a coarse grain parallelism at the functional level. Communication in Hardware-C is via parameter passing and message passing with synchronous semantics. Occam The Occam language [66] is based on Communicating Sequential Processes (CSP) [63].

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