Maintaining 32-bit and 64-bit versions in the same library
It is possible with ModelSim to maintain 32-bit and 64-bit versions of a design in the same library. To do this, you must compile the design with one of the versions (32-bit or 64-bit), and "refresh" the design with the other version. For example:
Using the 32-bit version of ModelSim:
vcom file1.vhd vcom file2.vhdNext, using the 64-bit version of ModelSim:
vcom -refreshDo not compile the design with one version, and then recompile it with the other. If you do this, ModelSim will remove the first module, because it could be "stale."
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