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VLASIC: A Catastrophic Fault Yield Simulator for Integrated Circuits

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2 Author(s)
Walker, H. ; Department of Computer Science and the SRC-CMU Center for CAD, Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA, USA ; Director, S.W.

This paper describes the yield simulator VLASIC (VLSI Layout Simulation for Integrated Circuits). VLASIC is a Monte Carlo simulator that uses defect models and statistics to place random catastrophic point defects on a chip layout and determine what circuit faults, if any, have occurred. The defect models are described in tables, and so are readily extended to new processes or defect types. The defect statistical model is based on actual fabrication line data, and has not appeared before in the literature. The circuit fault information generated by VLASIC can be used to predict yield, optimize design rules, generate test vectors, evaluate redundancy, etc. A redundancy analysis system which uses these data is described, and an example of its use given.

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:5 ,  Issue: 4 )