Found pins functioning as undefined clocks and/or memory enables

[Altera_Forum]

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?

[Altera_Forum]

I believe this happens if for example you are using an external clock, you need to tell Quartus timing analiser that the signal is a clock: go into assignments - Timing Analisys Settings; click on Individual Clocks and select New. Type a name for the input and select the node, the required fmax I guess is the maximum frequency of that clock. By doing this the timing analisys will check if the circuit can run a t that frequency. Hope this helps.

[Altera_Forum]

--- Quote Start ---  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?  --- Quote End ---    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.

[Altera_Forum]

--- Quote Start ---  I believe this happens if for example you are using an external clock...   --- Quote End ---    From my experience people always remember to set the external clock (if he knows that he uses such pin as clock) but forget about the implicit generated signal (as node in design) that is used to drive other register in an "always @ block" inferred by the synthesis tool as clock port of the register.  Check you design to see whether you are intended to use such generated signal as clock or you just accidentally do so, it might be not your intention.