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Unified Simulation Using Flow Tables Disclosure Number: IPCOM000034442D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27

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Ditlow, GS [+details]


There are predominantly two classes of simulators in use today -- switch level [1] and gate level [2]. When simulating chips or large macros, a gate level representation is preferable for performance reasons since the simulation time is an order of magnitude faster than with a switch level representation. However, previous gate level representations have modeled Boolean behavior only and not the non-Boolean behavior of pass transistors [3]. Described here is a generalized gate level simulator which uniformly simulates both gate level and switch level designs. This is accomplished by creating "flow tables" [4] from the design. Flow tables model the sequential behavior in precharged and charge sharing FET circuits. They are also useful in the analysis of latches implemented with gates.