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Delay hazards in complex gate based speed independent VLSI circuits

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3 Author(s)
N. Tabrizi ; Dept. of Electr. & Electron. Eng., Adelaide Univ., SA, Australia ; M. J. Liebelt ; K. Eshraghian

Although speed independent VLSI circuit design is supported by rich theory at higher levels, it suffers from the lack of an area efficient robust transistor level implementation technique. In this paper we introduce safe cells based on which well-formed STGs can be implemented free of (delay) hazards with no unrealistic assumptions about physical gates. Although this technique still compromises chip area for the sake of preventing hazards, we show that it may achieve a significant area gain in comparison with the two-phase RS-implementation method, which is one of the few true speed independent implementation techniques that we are aware of so far. Delay hazards are then analysed in complex gate based speed independent circuits and hence theorems are developed to identify a subclass of delay hazards

Published in:

VLSI, 1996. Proceedings., Sixth Great Lakes Symposium on

Date of Conference:

22-23 Mar 1996