Modeling and simulation of VLSI digital systems

Discrete simulation of digital circuits is a vital tool in the design process. However, few people are aware of the modeling assumptions inherent in discrete simulation. Nor is there a widely accepted and consistent theory of modeling and simulation of discrete/digital systems. In this paper we concentrate on the basic ideas behind discrete modeling and present a discussion of the most popular algorithms used in writing simulators. In addition, we use the characteristics of discrete models to define the logic, functional, and behavioral levels of simulation. In closing, we discuss new issues in modeling and simulation.