Embedded Systems Development: From Functional Models to by Alberto Sangiovanni-Vincentelli, Haibo Zeng, Marco Di

By Alberto Sangiovanni-Vincentelli, Haibo Zeng, Marco Di Natale, Peter Marwedel

This booklet bargains readers wide insurance of strategies to version, confirm and validate the habit and function of advanced dispensed embedded platforms. The authors try to bridge the distance among the 3 disciplines of model-based layout, real-time research and model-driven improvement, for a greater realizing of the ways that new improvement flows will be developed, going from system-level modeling to the proper and predictable iteration of a dispensed implementation, leveraging present and destiny examine results.

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For such computations, the Cyclo-Static Dataflow (CSDF) [21] model of computation generalizes SDF by allowing the number of tokens consumed or produced by an actor to vary according to a fixed cyclic pattern. Each firing of a CSDF actor corresponds to a phase of the cyclic pattern. In Fig. 1, if the input token count of the interleave actors is replaced by a cyclic pattern (64, 128, 256), then the result is a CSDF model that interleaves incoming streams following a deterministic cyclic pattern of input token counts.

Each actor needs to wait until the respective producing actor has generated the required number of tokens, which imposes restrictions on the minimum buffer sizes required to implement the channels. For the example model in Fig. , one firing of the interleave actor depends on 128 firings of the distribute actor. Hence any channel between the two actors must accommodate at least 128 tokens. Static analysis can also determine the buffer sizes of the channels needed to meet the throughput requirements of the model.

In this section we discuss this flow using an OFDM transmitter application as a driving example. 1 Design Environment The user works in a graphical environment as shown in Fig. 1. g. a DSP algorithm, which the user starts drawing by selecting actors from the Actor Library and placing them on the editor canvas. This begins the Fig. 2 Design and implementation flow in DSP design module 2 Modeling, Analysis, and Implementation of Streaming Applications 29 Model Specification step. g. FFT and FIR blocks from Xilinx Coregen [19]), and user-defined actors that are either specified in the LabVIEW programming language or previously defined models constructed using DSP Design Module.

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