A Specification Style of Four-Phase Handshaking Asynchronous Controllers and the Optimization of Its Return-to-Zero Phase

Rafael K. MORIZAWA  Takashi NANYA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E83-A   No.12   pp.2446-2455
Publication Date: 2000/12/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: VLSI Design Methodology
Keyword: 
asynchronous circuit,  asynchronous specification,  logic synthesis,  CAD tool,  

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Summary: 
A known problem of the four-phase handshaking protocol is that a return-to-zero phase of the signals involved in the handshake is necessary before starting another cycle, in which no useful work is usually done. In this paper we first define an easy-to-write specification style to specify four-phase handshaking asynchronous controllers that can be translated to an STG to obtain a gate-level implementation using existing synthesis methods. Then, we propose an algorithm that takes the specification written using our specification style and finds an optimized timing in which the idle-phase overhead of its gate-level implementation is reduced.