ISE
Using Partitions - What to do First
A Partition is set on a source instance to enable reuse. Partitions can be set on HDL, Schematic or EDIF source instances at any level of the hierarchy. When a lower-level source instance is defined as a Partition, the top module is automatically defined as a Partition as well. In Verilog, the Partition is set on a module instance. In VHDL the Partition is set on an entity architecture.
  1.  Before synthesis, decide which nodes in the design hierarchy will be Partitions. The design hierarchy is visible in the Project Navigator graphical environment in the Hierarchy pane of the Design panel.
  2.  Add the design files to the project to see the complete design hierarchy.
  3.  If using a Tcl environment, the command search * -type instance returns the instance hierarchy for the project. Source files may be added to the project with the xfile add command.
See Also
Using Partitions - To Use Partitions
Partition Overview
Creating New Partitions

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