Download A Designer's Guide to Asynchronous VLSI by Peter A. Beerel PDF

By Peter A. Beerel

Skip the restrictions of synchronous layout and create low energy, greater functionality circuits with shorter layout instances utilizing this functional consultant to asynchronous layout. the basics of asynchronous layout are lined, as is a huge number of layout kinds, whereas the emphasis all through is on useful recommendations and real-world purposes.

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Extra info for A Designer's Guide to Asynchronous VLSI

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One 20 Channel-based asynchronous design wire is referred to as the data_1 or true wire and the other as the data_0 or false wire. Handshaking is initiated when a data wire rises; this represents both the value of the data wire and the validity of the data. The receiver can detect the validity of the input data simply by ORing the data_0 and data_1 wires. In many templates the data triggers a domino dual-rail logic datapath concurrently. Other forms of 1-of-N datapath are also possible. e. two data wires are still used per bit communicated).

3 Asynchronous memories and holding state Notice that the SEQ and PAR modules operate on only request and acknowledge signals or 1-of-1 channels and are thus distinct from the datapath. Despite having an internal state variable, which is necessary to ensure the proper handshaking sequence, these modules do not include multi-bit latches or flip-flops in which data is stored. In pipeline buffer modules, the value of the data is stored on the channels. Neither type of module represents a means of storing data or building a memory.

Signals may have been added, and port names may have been changed, forcing the designer to be familiar with the details of the conversion. Bjerregaard et al. [15] proposed using SystemC to model asynchronous circuits and have created a library to support CSP channels. As in VHDL, implementing fine-grained concurrency in SystemC is cumbersome. Also, the modeling of timing is not addressed in their approach. 48 Modeling channel-based designs In [8], Verilog together with its programming language interface (PLI) was proposed.

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