What are non resettable flops and their significance in GLS
What is 0 – delay simulations and timing simulations, how they differ. Why 0-delay simulations are important
Some companies only does gls signoff with 0-delay simulation, justify the same
What are various timing simulation corners, how is it related to PVT corners
What type of timing simulations catch setup violations, which catch hold violations
If a test is failing in gls run, what is the debug procedure
When there is a x propagation in SOC GLS runs, test invariably hangs. Explain.
How do we debug timing violations in gls runs. How setup time violations are fixed? How hold time violations are fixed?
Can setup violations and hold time violations be fixed by GLS verification engineer in testbench. If not how these are fixed.
What is timing ECO. how does these impact GLS simulations?
What is functional Eco. How they impact GLS simulations
What is base tape out and metal tape out. How these are related to GLS simulations.
What power aware GLS runs, how they are different from normal gls runs.
What are the different reasons why x propagation happens in GLS runs.
What is the tool option used for disabling timing checks.
What does no notify tool option does
Why gls simulations are long running compared to rtl
RTL Coding style suppresss x propagation, where as GLS net list propagates x propagation, illustrate using an example.
What is SDF annotation. What are the issues faced during annotation.
What is zero delay loop. Significance in gls runs. How do we fix these issues.
If DFF output gives unwanted behavior, with all inputs proper. How do you fix these kind of issues
What are the contents of SDF
What are the different types of timing checks in timing simulations
How do you debug x propagation in gls simulations
How do you identify gls tests from RTL test plan
Write a vcs simulator force file for generating a clock at 100mhz frequency
What is the difference between force release and force deposit
Where do we use these.
Write a force file to replicate a signal behavior on another port in net list.
What is flattened net list and how it impacts GLS tests
What is synchronizer flops. How they are related to GLS.
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