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Old 06-30-2005, 10:01 AM
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Default Cannot find net in ucf, but it's there....

I'm getting the error during building that it cannot find a certain net
that is referenced in the .ucf file. But the net does exist. It's an
input clock signal that is defined in the VHDL file and the MPD. Is
tehre somewhere else I need to define it for the ucf to be able to
locate it?

Thanks again. (Sorry for so many questions...)

Jim Tuilman

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Old 06-30-2005, 11:03 AM
Symon
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Default Re: Cannot find net in ucf, but it's there....

Jim,
Leave the constraint out of the UCF, run translate, and look at the
Floorplanner. Can you see the net then? Or, with the constraint still out of
the UCF, run map, and use the FPGA editor to find the net.
Cheers, Syms.
<[email protected]> wrote in message
news:[email protected] oups.com...
> I'm getting the error during building that it cannot find a certain net
> that is referenced in the .ucf file. But the net does exist. It's an
> input clock signal that is defined in the VHDL file and the MPD. Is
> tehre somewhere else I need to define it for the ucf to be able to
> locate it?
>
> Thanks again. (Sorry for so many questions...)
>
> Jim Tuilman
>



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  #3 (permalink)  
Old 06-30-2005, 12:33 PM
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Default Re: Cannot find net in ucf, but it's there....

I'll try that, thanks. Altough I never used floorplanner, or the FPGA
editor. I just started this 2 months ago

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  #4 (permalink)  
Old 06-30-2005, 01:03 PM
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Default Re: Cannot find net in ucf, but it's there....

I already found the problem:

apparentlythe ucf files are case sensitive, and I forgot a cap
d'oh!

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  #5 (permalink)  
Old 06-30-2005, 08:46 PM
Andy Peters
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Default Re: Cannot find net in ucf, but it's there....

[email protected] wrote:
> I already found the problem:
>
> apparentlythe ucf files are case sensitive, and I forgot a cap
> d'oh!


Yep -- That's one reason why it's usually convenient to start out with
no constraints and run the tools once. Then back-annotate the pin list
into the .ucf. Then you'll have all of the pins and their
(assigned-by-the-tools locations. You can then go in with a text
editor and change the pin locations, or use the GUI to do it.

-a

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Old 07-01-2005, 07:19 AM
Rudolf Usselmann
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Default Re: Cannot find net in ucf, but it's there....

Andy Peters wrote:

> [email protected] wrote:
>> I already found the problem:
>>
>> apparentlythe ucf files are case sensitive, and I forgot a cap
>> d'oh!

>
> Yep -- That's one reason why it's usually convenient to start out with
> no constraints and run the tools once. Then back-annotate the pin list
> into the .ucf. Then you'll have all of the pins and their
> (assigned-by-the-tools locations. You can then go in with a text
> editor and change the pin locations, or use the GUI to do it.
>
> -a




Another small hint:

if you are trying to constrain internal nets, make sure you
did not select the flatten option. If your design is flattened,
the hierarchy and net names will change and will be renamed.

Regards,
rudi
================================================== ===========
Rudolf Usselmann, ASICS World Services, http://www.asics.ws
Your Partner for IP Cores, Design, Verification and Synthesis
****** Certified USB 2.0 HS OTG and HS Device IP Cores ******
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