Avery Design Systems, Inc.

Hong-zu Chou

Kai-Hui Chang

Christopher S Browy

Chi-Lai Huang

Yueh-Shiuan Tsai

Andrew Stein

A computer executable tool analyzes a gate-level netlist and uses an analysis result for accelerating a timing-accurate gate-level logic simulation via a parallel processing. The analysis identifies the following elements in the gate-level netlist: (1) netlist wires at partition boundaries for a value propagation; (2) netlist wires whose activities should be suppressed for a better performance; and (3) upstream FFs for partition boundaries to reduce a synchronization overhead. This information is then used to improve a parallel simulation performance.

System and method for accelerating timing-accurate gate-level logic simulation

A computer executable processing component analyzes unknown (X) propagation from uninitialized latches in gate-level simulation and determines if the Xs cause false Xs to be generated due to X-pessimism. For Xs generated due to X-pessimism, simulation results are corrected and fixes are generated. Corrected simulation results match real hardware behavior and greatly reduces engineers' analysis effort on debugging X issues. A computer executable processing component analyzes unknown (X) propagation from sequential cells in gate-level logic simulation and determines if the Xs cause false Xs to be generated due to X-pessimism. For Xs generated due to X-pessimism, simulation results are corrected and fixes are generated. Corrected simulation results match real hardware behavior and greatly reduces engineers' analysis effort on debugging X issues.

Systems and methods for fixing X-pessimism from uninitialized latches in gate-level simulation

A computer executable tool analyzes Boolean logic in a gate-level netlist responsible for generating false Xs due to X-pessimism in logic simulation to produce a compact fix that corrects the X-pessimism problem. The fix restores logic simulation value from X to hardware-accurate non-X value and solves X-pessimism issues in logic simulation.

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Taipei, Taiwan

Hong-zu Chou