ID:13436 Verilog HDL Compiler Directive warning at <location>: ignoring illegal value "<name>" for unconnected_drive directive

CAUSE: In a Verilog Design File (.v) at the specified location, you used the `unconnected_drive compiler directive with the specified value. However, the value you specified is not legal for the `unconnected_drive directive. The only legal values are pull0 and pull1.

ACTION: No action is required. To stop this message, specify a value of pull0 or pull1 for the `unconnected_drive directive.