| CAUSE: | Because the Quartus II software identifies all pins feeding the clock input of a register that do not have a Clock Settings assignment as undefined clocks, the Timing Analyzer is assuming the specified node is an undefined clock for timing analysis purposes. |
| 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:
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- PLDWorld - |
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