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VHDL warning at <location>: used X for unrecognized character <name> in enumerated type


CAUSE: In a VHDL Design File (.vhd) at the specified location, you used an enumerated type with the specified character. However, Integrated Synthesis does not recognize the character. As a result, Integrated Synthesis used X for the character.
ACTION: If you do not want Integrated Synthesis to use X for the unrecognized character, or to avoid receiving this message in the future, use only recognizable characters in the enumerated type. Otherwise, no action is required.

See also:

Section 3.1.1 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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