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A METHOD FOR THE DETECTION OF INITIALIZATION PROBLEMS IN 2-STATE SIMULATION

IP.com Disclosure Number: IPCOM000008348D
Original Publication Date: 1997-Sep-01
Included in the Prior Art Database: 2002-Jun-07

Publishing Venue

Motorola

Related People

Authors:
Mike Braddock Richard Duerden Jeff Freeman

Abstract

In a multi-state simulator, signals and registers are pre-initialized to "unknown" logic values (e.g. "X"). A multi-state simulator will propagate these unknowns through logic according to rules in the simulator. The advantage in doing this is that the appearance of these unknowns later in simulation often indicates a problem in a model's reset logic. By definition, a Z-state simulator can only represent signal or register values of "0" and "I", and thus problems in a model's reset logic are more difficult to detect.