This should not be an issue normally. What catches people off guard sometimes is that vopt (by default) tries to optimize the design by removing duplicated signals (i.e. the clock signal that propagates to many levels in the design) from its database. The signal is still there, but not always visible at all levels. Reducing the database speeds up the simulation time. You can control this behavior with the 'accessibility' parameter of vopt (you have access to more signals, but do not have a speed up).

However, we can not really help you sort out problems you have with running standard EDA tools.
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waves - by mahalakshmir.ma - 11-29-2019, 10:28 AM
RE: waves - by kgf - 11-29-2019, 10:40 AM

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