Download e-book for iPad: A Designer's Guide to Asynchronous VLSI by Peter A. Beerel

By Peter A. Beerel

ISBN-10: 0521872448

ISBN-13: 9780521872447

Pass the restrictions of synchronous layout and create low strength, greater functionality circuits with shorter layout occasions utilizing this functional advisor to asynchronous layout. the basics of asynchronous layout are lined, as is a big number of layout kinds, whereas the emphasis all through is on useful suggestions and real-world purposes.

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Extra info for A Designer's Guide to Asynchronous VLSI

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Modeling half buffers requires more intricate connections between input and output handshaking; this, while possible, is beyond the scope of this text. 2 Using synchronization channels and probes Supporting synchronization channels requires macros different from SEND and RECEIVE because there is no value to be sent or received. The modified macros are SEND_SYNC and RECEIVE_SYNC. In addition, the two macros PROBE_IN and PROBE_OUT provide the ability to identify pending communications on INPORTS and OUTPORTS.

At this point, R resumes activity and reads the value. The completion of the send action in S is said to coincide with the completion of the receive action in R. v). v). Notice that the S and R processes are thus synchronized at their respective points of send or receive communication. In CSP there is no notion of time and communication is performed instantaneously. e. out! and in?. Another abstract construct, called a probe, is also defined. In this construct a process p1 can determine whether another process p2 is suspended on the shared channel C waiting for a communication action to happen in p1 [2].

An illustrative application of CSP is its model of the dining philosophers’ problem, originally proposed by E. W. Dijkstra. 1. Adjacent philosophers share one chopstick. They spend time either thinking or trying to eat. A philosopher must have both the chopstick on the left and the chopstick on the right to eat. Consequently, adjacent philosophers cannot eat at the same time. The dining philosophers’ problem consists of finding an algorithm for sharing chopsticks that prevents deadlock and starvation.

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

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