Quartus

Can't place fast or enhanced PLL <name> in PLL location <name> because PLL requires <number> external clock output ports but the PLL location only has <number> external clock output ports

CAUSE: You assigned the specified fast PLL or enhanced PLL to the specified location. However, the Fitter cannot place the specified PLL because the PLL requires more external clock output ports than are available in the PLL location on the device.
ACTION: Modify the design so that the specified PLL uses fewer external clock output ports, or assign the PLL to a PLL location that has enough external clock output ports.

See also:

Assigning an Entity or Node to a Location
Changing Assignments
Deleting Assignments in the Assignment Organizer
Overview: Making Assignments
Overview: Working with Assignments in the Floorplan Editor

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