| CAUSE: | You compiled a design. During compilation, the Compiler found one or more pins that are functioning as undefined clocks in the design. The Quartus II software identifies a pin that feeds the clock input of a register that does not have a Clock Settings timing assignment as an undefined clock. |
| ACTION: | Altera recommends that you create clock settings and assign the clock settings to the pin(s) that are functioning as clocks in the design. If you do not want the Quartus II software to treat a pin feeding the clock input of a register as an undefined clock, you can turn on the Not a Clock assignment for the pin. |
See also:
Compiling a Design
Making Individual Timing Assignments
Overview: Using Clock Settings
Overview: Using the Timing Analyzer
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