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Structured Development for Real-Time Systems by Paul T. Ward, Stephen J. Mellor

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Chapter 4. Task Modeling

Introduction

The processor model provides a specification of the transformations and stored data assigned to each processor used to implement a system. It is now necessary to reorganize and elaborate the model to adapt it to the internal organization of each processor. This step corresponds to the second stage of the implementation model — the task stage.

The processor model may prescribe the use of any type of processor, and thus portions of the model may be implemented not only as software but also as hard-wired circuits or even as manual procedures. Since we must now account for their internal organization, we must begin to distinguish between different types of processors. In this chapter, we shall focus our attention ...

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