ID:15259 LCELL atom "<name>" is dependent on unconnected input ports

CAUSE: The specified LCELL atom has a LUT_MASK parameter value that is sensitive to changes on an input port that is not connected. The LUT_MASK must be simplified or the appropriate input port must be added. This message may occur if one or more inputs of the LCELL atom are left dangling either directly or after hierarchy flattening.

ACTION: Check the design to make sure all lower level hierarchies are properly connected to the top level. If you are using an EDA tool, contact the technical support for the EDA tool regarding this message.