ID:186480 Ignored assignment to node "<name>" because the node is not a simple register

CAUSE: The Fitter ignored the assignment you made to the specified node because the node is not a simple register. A simple register is a logic cell that does not use its four-input LUT, uses a registered output, and is not part of a carry or cascade chain.

ACTION: Delete the assignment from the specified node and set tight timing constraints in order to instruct the Fitter to optimize I/O to register connections.