Intel® Quartus® Prime Software
Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
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How to mark a pin and/or net as being a clock?

Altera_Forum
Honored Contributor II
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I have an input pin in my design that I am using to bring in an external clock signal. I created a very simple test case where my entire design consists of a single DFF, which I clock with the external signal I'm bringing in. 

 

I am getting the following warning: 

"Warning: Node: ext_clk_sig was determined to be a clock but was found without an associated clock assignment." 

 

I tried marking the input pin as a clock in the assignment editor by adding an "assignment name" of "global signal" set to a value of "global clock". This assignment has its "enabled" field set to "yes". 

 

Apparently I need to do more to get the Quartus compiler to treat my clock signal as a clock. Timing is critical on this signal. What do I need to do to make it clear to quartus that this pin needs to be treated like a clock? 

 

I really hope I do not have to use one of the dedicated clock pins. I do not have access to these on my current hardware platform. 

 

LH
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Altera_Forum
Honored Contributor II
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for static timing analysis with TimeQuest, declare the clock in an .sdc file and add it to your project under Assignments > Settings > Timing/TimeQuest

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