Active and Inactive state of assertion

Is their any rules for activation and inactive of assertion.
Some times it gets active and never inactive even if the assertion ens and the pass count is only 1.
Some times it never gets active if even if the antecedent pass.

In reply to CHITTARANJAN PATRA:
I explain in my SVA Handbook 4th Edition the Assertion states and the outcomes, This link provides the 4 pages about this topic, it represents important concepts.

I also recommend that you read my paper Understanding the SVA Engine,
Verification Horizons - July 2020 | Verification Academy

Ben Cohen
http://www.systemverilog.us/ ben@systemverilog.us
For training, consulting, services: contact Home - My cvcblr

** SVA Handbook 4th Edition, 2016 ISBN 978-1518681448

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