Coverage

If code coverage is 100% and functional coverage is 100% then how can we ensure that all features in the Spec is covered. If some portion of the code is missing in the RTL then how can we find such type of issues to signoff the verification

In reply to pradeep123:

Please read the following cookbook Coverage/Kinds of coverage | Verification Academy
HTH,
-R

In reply to pradeep123:

If code coverage is 100% and functional coverage is 100% then how can we ensure that all features in the Spec is covered. If some portion of the code is missing in the RTL then how can we find such type of issues to signoff the verification

This is a question of verification planning. And in the real life you do not have functional coverage of 100 %.
Your verification plan should have links to the functional and assertion coverage, but it should also reflect the requirements of your spec. If you miss some portions of requirements from your spec you a poor functional coverage model.
See here how averification plan could look like and how you can avoid to miss parts of your spec requirements: