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

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Chapter 2. Identifying Implementation Constraints

Introduction

One of the most consistent complaints about graphics-based modeling techniques has been that they are “incomplete” in terms of specification of quantitative details. A rigorous model of a system to be developed clearly must be complete in a quantitative sense as well as in a qualitative sense. However, the specification of quantitative details is often hampered by a confusion about implementation-dependence. For example, if three input signals must be sampled at the same rate and processed over the same time interval, the equation in Figure 2.1 expresses a constraint that applies only if the signal processing is sequenced within a single task. Consider the situation where a processor ...

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