Incremental Directives and Target WNS - 2021.2 English

You can use incremental directives to specify the target WNS for the implementation flow. The target WNS determines whether the implementation tools try to close timing or only try to achieve the same level of timing closure as the reference checkpoint. When the implementation flow uses the default algorithms, the incremental directive is ignored and the place_design and route_design directives are used.

The following table shows each incremental directive and the corresponding target WNS behavior.