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A practical comparison of asynchronous design styles

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2 Author(s)
Lloyd, D.W. ; Micro Cores Dev., STMicroelectronics, Bristol, UK ; Garside, J.D.

It is well known that single-rail bundled-delay circuits provide good area efficiency but it can be difficult to match them with appropriate delay models. Conversely delay insensitive circuits such as those employing dual-rail codes are larger but it is easier to ensure timing correctness. In terms of speed bundled-delay circuits need conservative timing but dual-rail circuits can require an appreciable completion detection overhead. This paper compares designs in both of these styles and also a delay-insensitive 1-of-4 coded circuit using the practical example of an ARM Thumb instruction decoder The results show that, through the application of careful optimizations, the 1-of-4 circuits out-performed single-rail circuits and reduced the power compared to dual-rail circuits

Published in:

Asynchronus Circuits and Systems, 2001. ASYNC 2001. Seventh International Symposium on

Date of Conference: