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Pass-transistor asynchronous sequential circuits

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2 Author(s)
Whitaker, S.R. ; NASA VLSI Hardware Accel. Center for Space Res., Idaho Univ., Moscow, ID, USA ; Maki, G.K.

Design methods for asynchronous sequential pass-transistor circuits, which result in circuits that are hazard- and critical-race-free and which have added degrees of freedom for the input signals, are discussed. The design procedures are straightforward and easy to implement. Two single-transition-time state assignment methods are presented, and hardware bounds for each are established. A surprising result is that the hardware realizations for each next state variable and output variable is identical for a given flow table. Thus, a state machine with N states and M outputs can be constructed using a single layout replicated N+M times.<>

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Solid-State Circuits, IEEE Journal of  (Volume:24 ,  Issue: 1 )