Digital system simulation method and apparatus having two signal- level modes of operation

摘要

A digital system simulation apparatus and method enable better efficiency and precision of system simulation by operating in either a four signal-level mode or a nine signal-level mode, depending upon the particular circuitry being employed. All signal outputs are generated in the nine signal-level mode, however, when the output is directed to a gate level circuit element, the apparatus and method automatically mask the strength data in the output signal thereby providing the four signal- level mode of operation.