Found pins functioning as undefined clocks and/or memory enables

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.