| CAUSE: | You used a Tcl script or used a text editor to modify the Entity Settings File (.esf) to assign an fMAX requirement of 0 or less. However, the fMAX requirement must be a value greater than 0. When the Quartus II software encounters an illegal fMAX requirement value, it uses the default value you specified for the requirement. |
| ACTION: | If you do not want to use the default value, change the value of the fMAX to a value greater than zero. |
See also:
Overview: Using the Timing Analyzer
Specifying Project-Wide Timing Requirements
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