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

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Chapter 3. Processor Modeling

Introduction

The first stage in translating the essential model into a picture of the desired implementation is to identify the processors that will carry out the work of the system. It is then possible to reorganize the essential model around the processors chosen. The resulting model has the same content as the essential model, and predicts the same system behavior, but has a different upper-level partitioning. Figure 3.1 suggests the difference in organization between the two models. Note that the transformation schema notation is used differently in the two models; in the essential model a transformation may only represent a portion of the work done by the system, while in the processor stage of the implementation ...

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