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Visitor hbaumann
Visitor
697 Views
Registered: ‎01-31-2018

XADC predifined Package Pins ?

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Hi

 

I included an XADC-Core into my design and want to assign the external ports (vn_in, vp_in) to a specific Package Pin.

My Problem is that i cant choose those Package Pins in the "I/O Ports"-view for the vn_in/vp_in -ports.

It seems like they are in some sort predefined because Vivado only offers me only one Package Pin to chose from.

For vn_in i can only choose Package Pin "L10" or "<Unplace>".

 

P.S. there are plenty of free Package Pins left.

 

What I am doing wrong, what I am missing, which circumstances can lead to this ?

 

Thanks 

Heiko

xadc_pin.png
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1 Solution

Accepted Solutions
Scholar drjohnsmith
Scholar
759 Views
Registered: ‎07-09-2009

Re: XADC predifined Package Pins ?

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yep

 

the analog pins are special 

 

and are only on certain pins ,

 

 

<== If this was helpful, please feel free to give Kudos, and close if it answers your question ==>
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4 Replies
Moderator
Moderator
689 Views
Registered: ‎08-08-2017

Re: XADC predifined Package Pins ?

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Hi @hbaumann

 

Vp_0 and VN_0 are dedicated differential analog input pair and User do not have control to choose the package pins. Package pins are fixed for this input.

 

Capture.PNG

 

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Visitor hbaumann
Visitor
683 Views
Registered: ‎01-31-2018

Re: XADC predifined Package Pins ?

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Hi @pthakare

 

Thanks for the quick answer !

Does this also apply for the "vaux"-ports ? 

I have the same problem with them. For example I can only chose between "B20" or "<Unplace>" for port "vauxn0". 

This applies for all the XADC-ports you can see in my screenshot. The selected Package Pins there are the only ones I can choose.

 

Thanks

Heiko

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Scholar drjohnsmith
Scholar
760 Views
Registered: ‎07-09-2009

Re: XADC predifined Package Pins ?

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yep

 

the analog pins are special 

 

and are only on certain pins ,

 

 

<== If this was helpful, please feel free to give Kudos, and close if it answers your question ==>
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Visitor hbaumann
Visitor
672 Views
Registered: ‎01-31-2018

Re: XADC predifined Package Pins ?

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Ok thanks for the quick help @pthakare and @drjohnsmith

 

 

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