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Altera_Forum
Honored Contributor I
960 Views

clock problem on De0 nano board (schematics file)

hello,  

 

i don't have seen the same problem with a good solution, so i ask here, 

 

I try to do a counter which is suposed to count to ten at 1Hz but i have a warning i can't solve alone,  

 

I have this warning :  

 

Warning (21074): Design contains 1 input pin(s) that do not drive logic 

Warning (15610): No output dependent on input pin "CLOCK_50" 

 

https://alteraforum.com/forum/attachment.php?attachmentid=13918&stc=1  

 

thank you very much !
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4 Replies
Altera_Forum
Honored Contributor I
42 Views

It's just a warning, not an error. It can be safely ignored.

Altera_Forum
Honored Contributor I
42 Views

You have missed something if no output dependent on input pin "CLOCK_50"... 

Are you doing an asynchronous design?
Altera_Forum
Honored Contributor I
42 Views

Why is there vcc text near the clock_50 flag near the left side of your schematic Under the input text)? 

 

Is your clock net accidentally connected to vcc? If so the message makes sense, as no logic is then dependent on the input clock_50, and that one input does not drive any logic. 

 

I would check the schematic, and if possible the generated text nextlist, of your design. I suspect that clock_50 is not really connected.
Altera_Forum
Honored Contributor I
42 Views

Ah, I missed the VCC. That's probably the issue.