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Observer alex9
Observer
2,882 Views
Registered: ‎06-03-2010

How to choose the pin

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As the attached screen, I am trying to follow a example. This step is complete the ucf file and generate the bitstream.

 

It give error as attached when generating bitstream. It may because I am using different chip from the example, but how to choose the pin for this clock output. Also I am not clear of this clock signal.

 

Any suggestion, thanks.

ss.png
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1 Solution

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Teacher hgleamon1
Teacher
3,589 Views
Registered: ‎11-14-2011

Re: How to choose the pin

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It looks like you are trying to connect a differential clock to the design. Therefore, you need to select pins on your device that are suitable for such an input signal.

 

Straining my eyes (as you have not told us what device it is), it looks like you are trying to target a Spartan 6 LX45T in an FGG484 package. Have you checked whether your pin assignments in your UCF are valid for this device and package?

 

Your error message states that there is no such site on the device, so I would guess that you need to change the LOC constraints in the UCF to suit the targeted device (which should also then match your physical hardware).

 

Regards,

 

Howard

 

----------
"That which we must learn to do, we learn by doing." - Aristotle

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2 Replies
Observer alex9
Observer
2,881 Views
Registered: ‎06-03-2010

Re: How to choose the pin

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Another screenshot.

ss1.png
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Teacher hgleamon1
Teacher
3,590 Views
Registered: ‎11-14-2011

Re: How to choose the pin

Jump to solution

It looks like you are trying to connect a differential clock to the design. Therefore, you need to select pins on your device that are suitable for such an input signal.

 

Straining my eyes (as you have not told us what device it is), it looks like you are trying to target a Spartan 6 LX45T in an FGG484 package. Have you checked whether your pin assignments in your UCF are valid for this device and package?

 

Your error message states that there is no such site on the device, so I would guess that you need to change the LOC constraints in the UCF to suit the targeted device (which should also then match your physical hardware).

 

Regards,

 

Howard

 

----------
"That which we must learn to do, we learn by doing." - Aristotle

View solution in original post