Asynchronous wrapper for heterogeneous systems

We propose a new method for creating globally asynchronous locally synchronous (GALS) circuits. Each locally synchronous module is surrounded by an "asynchronous wrapper" which provides an asynchronous interface to an otherwise synchronous circuit. Every locally synchronous (LS) region ope...

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Vydané v:Proceedings International Conference on Computer Design VLSI in Computers and Processors s. 307 - 314
Hlavní autori: Bormann, D.S., Cheung, P.Y.K.
Médium: Konferenčný príspevok..
Jazyk:English
Vydavateľské údaje: IEEE 1997
Predmet:
Asynchronous circuits
Clocks
Delay
Educational institutions
Integrated circuit interconnections
Libraries
Metastasis
Protocols
Synchronization
Timing
ISBN:9780818682063, 081868206X
ISSN:1063-6404
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Shrnutí:We propose a new method for creating globally asynchronous locally synchronous (GALS) circuits. Each locally synchronous module is surrounded by an "asynchronous wrapper" which provides an asynchronous interface to an otherwise synchronous circuit. Every locally synchronous (LS) region operates independently, minimising problems of clock skew and enabling regions to run at different clock speeds if desired. Metastability can never cause the system to fail because an asynchronous handshake "stretches" or "pauses" the local clock until data has stabilised. When new data is not available for processing, the local clock stretches, automatically preventing the LS block from consuming power. Once new data does arrive, the block responds directly in phase with the handshake without wasted synchronisation time. The LS modules can be designed using typical synchronous techniques. However, since the external interface to each LS block uses asynchronous handshaking, we can now freely mix synchronous and asynchronous circuits.
ISBN:9780818682063
081868206X
ISSN:1063-6404
DOI:10.1109/ICCD.1997.628884