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AR# 8809

3.1i Constraints Editor - I cannot specify I/O configuration options for global ports


General Description:

Although I have selected several I/O configuration options from the Ports tab, the option to change the IOSTANDARD column is not available for any ports.


To work around this problem, hand-edit the UCF with the following syntax:

INST "<ibufg_or_bufg_inst_name>" IOSTANDARD= <io_standard>;

AR# 8809
Date Created 08/31/2007
Last Updated 01/18/2010
Status Archive
Type General Article