188.8.131.52. Clock Region Assignments in Intel® Arria® 10 and Older Device Families
In device families with dedicated clock network resources and predefined clock regions, this assignment takes as its value the names of those Global, Regional, Periphery or Spine Clock regions. These region names are visible in Chip Planner by enabling the appropriate Clock Region layer in the Layers Settings dialog box. Examples of valid values include Regional Clock Region 1 or Periphery Clock Region 1.
When constraining a global signal to a smaller than normal region, for example, to avoid clock congestion, you may specify a clock region of a different type than the global resources being used. For example, a signal with a Global Signal assignment of Global Clock, but a Clock Region assignment of Regional Clock Region 0, constrains the clock to use global network routing resources, but only to the region covered by Regional Clock Region 0. To provide a finer level of control, you can also list multiple smaller clock regions, separated by commas. For example: Periphery Clock Region 0, Periphery Clock Region 1 constrains a signal to only the area reachable by those two periphery clock networks.