manual clock

[Altera_Forum]

Hi there, 

 I am fresh new to Quartus/Cyclone and Everything related to them.  My first project at school consits of downloading a circuit to Cyclone II board and demonstrating that its output is correct.  What I am having problem at is the clock . I want the clock to be an input pin, by which I mean , I want to send out a clock signal every time I want (by turning on & off a switch or by using a push button on the board) and not have any internal or automatic clock.  I was trying to do something on my own with Timing Analysis Settings, but I think i messed up things even worse.  Right now I get the following warnings when compiling the project: warning: Can't achieve timing requirement Minimum Pulse Width Requirement (Low) along 3 path(s). See Report window for details. critical warning: Timing requirements for slow timing model timing analysis were not met. See Report window for details.  warning: Found 3 output pins without output pin load capacitance assignment  Info: Pin "A" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis  Info: Pin "B" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis  Info: Pin "C" has no specified output pin load capacitance -- assuming default load capacitance of 0 pF for timing analysis warning: The Reserve All Unused Pins setting has not been specified, and will default to 'As output driving ground'.  Below is also a part of the circuit if helpful.  http://permeti-jone.com/meti/prjct1.jpg   How can I set this up ? Thank you

[Altera_Forum]

I would use the internal clock as it is and use the push button signal as a clock enable instead

[Altera_Forum]

--- Quote Start ---  Hi there,  warning: Can't achieve timing requirement Minimum Pulse Width Requirement (Low) along 3 path(s). See Report window for details. critical warning: Timing requirements for slow timing model timing analysis were not met. See Report window for details.   Thank you  --- Quote End ---    Did you set frequency requirement for ur design? This warning seems that the design cannot fulfill your timing requirement.  However I agree with Bango's opinion about the clock n enable signal, or perhaps you just replace your "clock" input by "enable", it sounds more suitable.