Maintaining 32-bit and 64-bit modules in the same library

It is possible with ModelSim to maintain 64-bit and 32-bit versions of a design in the same library. To do this, you must compile the design with one of the versions (64-bit or 32-bit), and "refresh" the design with the other version. For example:

Using the 32-bit version of ModelSim:

vcom file1.vhd
vcom file2.vhd 

Next, using the 64-bit version of ModelSim:

vcom -refresh 

Do 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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