Quartus

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

CAUSE: The Compiler cannot implement the clique or carry or cascade chain because you assigned the first specified node to a location which conflicts with the location assigned to the second specified node by the Compiler. 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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