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ldm.eth
Explorer
Explorer
637 Views
Registered: ‎01-15-2019

Virtual pins without input values

Hi All,

I'd like to run a full flow (synthesis+implementation) for a certain hierarchy in my design. 

The issue is so that a number of ports in the hierarchy higher than a number of pins in the target device. So, implementation fails due to a lack of pins...

So, what's the solution? How to assign the hierarchy ports to virtual pins? The Virtual Inputs should not be tied to any value (nor LOW nor HIGH), otherwise an internal logic will be optimized and trimmed...

Thank you in advance for your help!

 

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marcb
Moderator
Moderator
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Registered: ‎05-08-2012

Hi @ldm.eth 

You could try adding the IO_BUFFER_TYPE constraint set to "NONE" for the IOs that you do not want. Vivado is required to place ports with buffer connections.

set_property IO_BUFFER_TYPE NONE [get_ports <port_name>]


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marcb
Moderator
Moderator
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Registered: ‎05-08-2012

Hi @ldm.eth 

Did the earlier suggestion help? If so, marking as an accepted solution will help others with the same question.


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