COSMOS: a compiled simulator for MOS circuits
DAC '87 Proceedings of the 24th ACM/IEEE Design Automation Conference
Automatic generation of behavioral models from switch-level descriptions
DAC '89 Proceedings of the 26th ACM/IEEE Design Automation Conference
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This paper presents a new algorithm for deriving the direction of signal flow in MOS circuits. The algorithm detects so-called unidirectional transistors. In a unidirectional transistor, signal flow is restricted to one direction during switch-level simulation, without compromising the simulation results. The algorithm uses a static analysis of the switch-level characteristics of the circuit, such as the transistor strengths and node capacitor sizes. It was implemented and used in the simulation of a large, commercial microprocessor. For this processor, 98.5% of the transistors were determined to be unidirectional by the algorithm. The simulation time for this processor decreased significantly when unidirectional transistors were detected.