Dynamic multi-level simulation of digital hardware designs

Article Abstract:

This paper presents the issue of dynamic multi-level simulation of hardware designs that addresses the problem of inefficiency associated with the conventional static multi-level simulation approaches as in ADLIB-SABLE (Hill 1980), DIANA (Demou and Arnout 1979), and SPLICE (Newton 1978). In this approach, digital simulation or verification (McWilliams 1980) of hardware designs is initiated at a high level of abstraction. When detailed results are required for one or more high-level components or for tracing the source of an error to any of the lower-level devices, the appropriate components are expanded into their lower-level implementations. Then simulation of verification initiates at that level. Following completion of execution at the lower level, control returns to the higher level. Consequently, only those subparts of a digital design are selected for expansion and detailed simulation that are dynamically warranted by the higher-level simulation results. Unnecessary simulation effort may be eliminated. Dynamic multi-level simulation or zooming is a generalization of the swapping technique (Szygenda 1973) to functional and fault simulation and timing verification and to the different abstraction levels in the hierarchy between the gate- and behavior-levels. This paper also addresses the implementation of zooming in the rule-based design verifier, RDV (Ghosh 1984), at Stanford University. That RDV used Ada (U.S. Dept. of Defense 1983) as a hardware description language and simulation environment (Ghosh 1985). (Reprinted by permission of the publisher.)

Circuit design, Computer aided design, Very large scale integration, Computer-Aided Design, Computer Design, ADA, Modeling of Computer Systems, Very-Large-Scale Integration, technical

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Simulation in the Service of Society

Article Abstract:

The Navy established its first analog simulation facility to test guided missiles in 1950. Although a digital computer facility was available in 1952, the slow discrete operation and poor format of the results made it unsuitable for missile system simulation. Discrete computations were necessary however, for the lethality-survivability simulations developed in 1957 to evaluate missile armaments effectiveness. A diagram presents simulation evolution and a table compares digital and analog simulation techniques.

Weapons, Tests, Evaluation, Computer history, Comparison, Testing, Military, Analog Systems, Digital Computers, History of Computing, Computerized Testing, Navy

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