A methodology for the design and implementation of by Truman T.E.

By Truman T.E.

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Product differentiation, firmware upgrades, and the flexibility of a software-based approach, on the other hand, pull towards implementing as much as possible in software. In practice, the final implementation is a mix of hardware and software. The problem of designing these hybrid systems and obtaining meaningful performance estimates is an area of active research known as “co-design” (see [ELLS97] and the references cited therein). 9 At the heart of the issue is that hardware and software naturally have two very different types of concurrency – interleaved and true parallel – and so design styles, representations, and simulation semantics are extremely domain-specific.

Each layer offers a set of services to the higher layers, hiding the details of how the services are implemented. The goal is to present the illusion to layer n on host A that the message exchange takes place atomically via layer n - 1 to a layer n peer on host B, as shown in Figure 1— 1. In reality, each layer passes data and control information the layer immediately below it, until the lowest (physical) layer is reached. The function of each layer is outlined in Table 1— 1. Figure 1— 1. OSI Protocol Layers Two dimensions of abstraction are present in this model: service abstraction and inter-layer communication abstraction.

Conceptually, the architecture is analogous to an output-buffered, self-routing packet switch. , pen vs. speech), and for each {data source, type tag} pair a unique device destination address is assigned. When a source has data of a particular type available, it uses the type tag to dynamically determine the corresponding sink to which the data should be sent. Thus, once initialization is complete, data transfers between source and sink are autonomous, requiring no microprocessor intervention. The type tag provides a mechanism to support lightweight protocols that provide data-specific transport services.

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A methodology for the design and implementation of by Truman T.E.
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