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AR# 62560

Does Vivado handle an undriven output port as an unused pin?


In my design I have declared an output pin in the top hierarchy, but it is not connected or driven from the design.

How is this port handled by Vivado?


The unconnected Output Port will not be handled as an unused pin.

The Bitstream setting of the unused pin Pulldown (Default) will not be applicable.

This port will behave as user I/O that is not driven.

Device reliability is not an issue with this usage, but a Floating/undriven state is not recommended.

Either delete these undriven ports in HDL, or handle it via Pullup/Pulldown externally.
AR# 62560
Date Created 10/21/2014
Last Updated 01/19/2015
Status Active
Type General Article
  • Vivado Design Suite