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ppi2040:[Error] The instance '$1I1/O' of component type 'OBUFT' is not supported or...
When compiling an XC7000 design with the 5.2.0 EPLD software
tools (workstation only), the following error may be
ppi2040:[Error] The instance '$1I1/O' of component type
'OBUFT' is not supported or the netlist was not generated with
the XC7000 library.
This is caused by errors in the xnf7000 library for version 5.2.0.
The problem has been fixed in XACT v5.2.1.
Either upgrade to XACT v5.2.1, or replace the xnf7000 directory
with the files from the XACT v5.2.1 release.