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12.4 IOBUFDS/IOBUF simulation in ISIM is not correct when mixed language design is used
Simulation of IOBUFDS or IOBUF with ISIM returns incorrect results.
I am trying to run behavioral simulation with the XAPP867 design.
This is due to ISIM having issues with mixed language designs.
The workaround for the XAPP867 design is to replace the Unisim model with the Verilog model of the same component.
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