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Visitor
Visitor
1,980 Views
Registered: ‎12-14-2012

about pull up a pin in XPS

hi,thank you for your attention.

i'm doing an IP block in Verilog ,while i pull up a pin in ISE verilog project , it works (add a pull up statement in UCF file), but then i make my own IP block with using the XPS Create or import peripheral function , turn out this pin does not really pull up, it pull high!!!!  i did NOT make any change !!!!

 found some information about using wrapper to pull pin up in EDK , but i don't understand how , anyone can share more details?

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Teacher
Teacher
1,971 Views
Registered: ‎11-14-2011

Re: about pull up a pin in XPS

I don't understand the difference between "pull up" and "pull high".

 

I would still use the UCF to apply an internal pull up to a pin. Just make sure that the pin in question is specified only in one UCF.

 

Regards,

 

Howard

 

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