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Verilog HDL Compiler Directive warning at <location>: illegal value for directive unconnected_drive <name> -- value is ignored

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 avoid receiving this message in the future, specify a value of pull0 or pull1 for the `unconnected_drive directive.

See also:

Section 19.9 of the IEEE Std. 1364-2001 IEEE Standard Verilog Hardware Description Language manual

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