A custom region is a type of location assignment. You can define any arbitrary rectangular region of physical resources on the target device as a custom region. Assigning nodes or entities to a custom region directs the Compiler place those nodes or entities inside the region during fitting.

A custom region exists in a project only as long as there are nodes or entities assigned to it. If no nodes or entities are assigned to a custom region, information about the region is not saved when you close the project.

Custom regions are currently supported for ACEX^® 1K, APEX^™ 20K, APEX^™ II, ARM^®-based Excalibur^™, Cyclone^™, FLEX 10KE, Mercury^™, Stratix^™, and Stratix^™ GX devices.

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