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106 VLSI Test Principles and Architectures 3.1 INTRODUCTION Simulation is the process of predicting the behavior of a circuit design before it is physically built. For digital circuits, simulation serves dual purposes. First, during the design stage, logic simulation helps the designer verify that the design conforms to the functional specifications. Second, during test development, fault simulation is used to simulate faulty circuits. (For this reason, logic simulation is generally referred to as fault-free simulation.) Given a set of test patterns, fault simulation determines its efficiency in detecting the modeled faults of interest. Furthermore, fault simulation is also an important component of automatic test pattern generator (ATPG) programs. 3.1.1 Logic Simulation for Design VeriFcation The main application of logic simulation is design verification , the process of verifying the correctness of a digital design prior to its physical realization in the form of silicon, a printed circuit board
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