Quartus

Function with value <number> in LUT cannot be empty


CAUSE: The EDIF Input File (.edf) contains the specified empty LUT equation; no value is specified for the lut_function keyword value. The source design may contain the error, or the design may have been incorrectly translated to the EDIF format.
ACTION: In the source design, specify a value for the lut_function keyword, or remove the keyword, and then generate a new EDIF Input File. In general, it is better to correct only the source design file rather than the EDIF Input File. If you prefer to edit the EDIF Input file, make sure it conforms to the format for EDIF version 2 0 0. If necessary, refer to your EDIF manual.

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