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M1.4 Map - Map creates an illegal IOB configuration with conflicting EC pin and OMUX usage.
WARNING:x4edr - blockcheck: In component ADR_DATA<26> the EC
pin is used while the OMUX is set to a constant. This
configuration is not supported.
This configuration is the result of an OBUFT with GND
driving the input. Map needs to source the GND external
to the IOB when EC pin is also used.
The work around is to force the GND signal external to the IOB
by adding the following attribute to the .ucf file:
NET "GND" KEEP ;
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