A Parallel Flop Synchronizer and the Handshake Interface for Bridging Asynchronous Domains

Suk-Jin KIM  Jeong-Gun LEE  Kiseon KIM  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E87-A   No.12   pp.3166-3173
Publication Date: 2004/12/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Logic Synthesis
Keyword: 
synchronizer,  two-flop,  metastability,  clock domain,  

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Summary: 
Inter-domain communications on a chip require a synchronizer to resolve the timing problems between an input and a clock of a destination. This paper presents a parallel flop synchronizer and its interface circuit for transferring asynchronous data to the clock domain. The proposed scheme uses a bank of independent two-flops in parallel and supports a two-phase handshake protocol. Compared to the conventional two-flop synchronizer, performance analysis shows that the proposed scheme can reduce latency up to one and a half of clock cycles while retaining its safety to a tolerable level. All designs have been implemented in a 0.25 µm CMOS technology to verify performance analysis of the proposed synchronization.