Abstract Shell and Nested DFX - 2023.1 English

In UltraScale+ designs only, the Abstract Shell and Nested DFX flows can be used together for the following use cases:

• Abstract Shells can be created for second-order RPs created by running pr_subdivide.
• pr_subdivide can be run on an Abstract Shell containing a routed RM to create new lower-order RP.
• Creating an Abstract Shell for a second-order RP.