10.1.4. Specific Global, Regional and Dual-Regional Clock Net Resources
For example because of characterization data, the PHY may require that the phy_clk is routed on a global clock net. The remaining clocks may all be routed on a global or a regional clock net. However, they must all be routed on the same type. Otherwise, the operating frequency of the interface is lowered, because of the increased uncertainty between two different types of clock nets. The design may still fit, but not meet timing.
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