CS-TR-686, Department of Computing Science, University of Newcastle upon Tyne, 1999. 1 An asynchronous communication mechanism using self-timed circuits F. Xia, A. Yakovlev, D. Shang, A. Bystrov, A. Koelmans and D.J.Kinniment COMPUTING SCIENCE TECHNICAL REPORT SERIES No. CS-TR-686 October, 1999