Quartus

Differential I/O standard <name> assigned to <name> pin of PLL <name> is illegal


CAUSE: You assigned the specified differential I/O standards to the specified pin of the specified PLL. However, the differential I/O standard you assigned to the specified pin is not supported by the specified PLL.
ACTION: Delete or change the I/O standards assigned to the specified pin.

See also:

Assigning Pins
Changing Assignments
Deleting Assignments in the Assignment Organizer Dialog Box
Overview: Making Assignments
Overview: Working with Assignments in the Floorplan Editor

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