Prime Computer Inc.

Mahesh Doshi

Roderick B Sullivan, Ii

Donald Schuler

Lorne Cooper

A digital system simulation apparatus and method enable a user to interactively control, during simulation, the sampling of signals in the digital system whose behavior is being simulated. The behavior of the system can be approximated better by recognizing and allowing a precise definition of element outputs even though the element inputs can include undefined variables. The apparatus allows efficient and better utilization of system memories by providing the capability of defining multiple outputs of the circuit elements in a single instruction when those outputs all have common inputs.

Digital system simulation method and apparatus

A digital system simulation apparatus and method to enable a user to interactively control, during simulation, sampling of signals in the digital system whose behavior is being simulated. The behavior of the system can be approximated by recognizing and displaying the circuit element inputs and outputs. Breakpoints can also be set, interactively, during simulation, for controlling initiation and termination of the sampling process. The method and apparatus can also sample upon the Nth occurrence of a specified condition.

Digital system simulation method and apparatus having improved sampling

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.

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Framingham, MA, United States of America

Mahesh Doshi