GLS Interview Questions — Basic to Advanced
Practice 40 GLS questions covering fundamentals, delay models, SDF annotation, timing checks, common errors, and signoff — tagged by difficulty.
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GLS
Debugging Timing Failures and Annotation Problems in GLS
Learn advanced GLS debugging — timing failures vs annotation issues, glitch suppression, pulse warnings, waveform delay problems, and NTC warnings.
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Debugging Common Gate-Level Simulation Failures
Learn to debug common GLS failures — zero-delay oscillation, CUVUNF hierarchy issues, FLFFNF SDF errors, and SDFNEP/SDFNET annotation mismatches.
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How to Run Gate-Level Simulation Step by Step
Learn how to set up a GLS flow — required inputs, zero-delay and SDF simulation, logs, annotation stats, debug switches, and regression methodology.
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How to Disable Timing Checks in Gate-Level Simulation
Learn how and why timing checks are disabled in GLS — elaboration switches, timing files, runtime commands, and best practices for managing violations.
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Understanding SDF Back-Annotation in Gate-Level Simulation
Learn SDF back-annotation — SDF file structure, annotation methods, MTM corner control, delay statistics, and verifying correct delay application in GLS.
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Zero Delay, Unit Delay and SDF Simulation Explained
Learn GLS simulation modes — zero delay, unit delay, SDF-annotated simulation, transport vs inertial delay models, and pulse rejection behavior.
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What Is Gate-Level Simulation and Why It Matters
Learn what Gate-Level Simulation (GLS) is, how it differs from RTL simulation, why STA alone is insufficient, and where GLS fits in chip verification.
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Gate-Level Simulation (GLS) — Complete Practical Guide
Learn Gate-Level Simulation (GLS) — delay models, SDF back-annotation, timing checks, common issues, and practical verification using Cadence Xcelium.
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