Quartus

Nodes or entities assigned to region <name> require <number> signal pairs of types (<type>, <type>) and (<type>, <type>), but the specified region can contain only <number> signal pair(s)

CAUSE: You assigned nodes or entities with the specified number of signal pairs of the specified types to the specified region, but the Fitter cannot place them in the region because the nodes or entities require more of the specified types of signals than the region can contain.
ACTION: Assign the nodes or entities to different regions.

See also:

Assigning a Node or Entity to a Location
Assigning Pins
Changing Assignments
Overview: Making Assignments
Overview: Working with Assignments in the Floorplan Editor

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