Found pins functioning as undefined clocks and/or memory enables

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After performing a Classical Timing Analysis, I got the following warning from Quartus II v 7.2:

"Found pins functioning as undefined clocks and/or memory enables"

I've created the clock for the node specified as undefined clock, then run the Timing Analyzer again. The warning are still there. Does anyone know how to define a clock?

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Hmm, you say you have defined the node specified as undefined clock, can you shows your create clock TCL settings and the original message of the warning message so that we can check for you? I need to know whether you set the clock correctly or not.