5.3.2. Using Logic Lock (Standard) Regions with the Design Partition Planner
By default, the Fitter usually places closely connected entities in the same area of the device; however, you can use Logic Lock (Standard) regions, together with the Design Partition Planner and the Chip Planner, to help ensure that logically connected entities retain optimal placement from one compilation to the next.
You can view the logical connectivity between entities with the Design Partition Planner, and the physical placement of those entities with the Chip Planner. In the Design Partition Planner, you can identify entities that are highly interconnected, and place those entities in a partition. In the Chip Planner, you can create Logic Lock (Standard) regions and assign each partition to a Logic Lock (Standard) region, thereby preserving the placement of the entities.