This paper provides eflcient design verification methodologies based on concurrent simulation technique which is implemented zn the interactive simulation automation system (ISAS). Concurrent simulation is not a new technique, however, the ISAS exploits many parallelisms during the simulation procedure and applies it to three different types of simulation: concurrent (C-sim), distributed concurrent (De-sim), and concurrent-concurrent (CON2FERS). ISAS automates the simulation procedure with a graphic user interface and handles not only fault models, but also desagn error models. It generates fault and design error coverage metrics for the user. This paper provides a description of three types of concurrent simulators with performance results.
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