worst neg slack
Worst Negative Path(WNS) points to the path having the maximum negative slack.
Total Negative Slack(TNS) gives the sum of all the negative slacks in the design.
From the value of TNS, we can know the severity of the slack in total design and whether to proceed or not with the current design model.
WNS slack can be negative or zero or positve.
It it is +ve, it means that there are no violations and it is giving the least of the positive slack. In this casee, TNS will be zero.
TNS can be either -ve or zero.