Quartus

Can't implement clique or cascade or carry chain -- node <name>, assigned to location <name> and node <text>, assigned to location <text>, belong to the same clique or carry or cascade chain but have conflicting location assignments

CAUSE: You assigned the specified nodes to conflicting locations. The Compiler cannot implement the clique or carry or cascade chain due to the conflicting location assignments of the specified nodes. The location assignments for the nodes in cliques or carry or cascade chains must be in contiguous positions.
ACTION: Remove or change one of the specified node assignments.

See also:

Assigning Pins
Changing Assignments
Working with Assignments in the Floorplan Editor

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