ModelSim SE User's Manual - Electrical and Computer Engineering

UM-66 3 - Design libraries
Regenerating your design libraries
ModelSim SE User’s Manual
Depending on your current ModelSim version, you may need to regenerate your design
libraries before running a simulation. Check the installation README file to see if your
libraries require an update. You can regenerate your design libraries using the Refresh
command from the Library tab context menu (see "Managing library contents" (UM-61)), or
by using the -refresh argument to vcom (CR-311) and vlog (CR-358).
From the command line, you would use vcom with the -refresh option to update VHDL
design units in a library, and vlog with the -refresh option to update Verilog design units.
By default, the work library is updated; use -work to update a different library.
For example, if you have a library named mylib that contains both VHDL and Verilog
design units:
vcom -work mylib -refresh
vlog -work mylib -refresh
An important feature of -refresh is that it rebuilds the library image without using source
code. This means that models delivered as compiled libraries without source code can be
rebuilt for a specific release of ModelSim (4.6 and later only). In general, this works for
moving forwards or backwards on a release. Moving backwards on a release may not work
if the models used compiler switches or directives that do not exist in the older release.
Note: You don't need to regenerate the std, ieee, vital22b, and verilog libraries. Also, you
cannot use the -refresh option to update libraries that were built before the 4.6 release.
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, as long as they haven’t been optimized by the vopt command (CR-371).
To do this, you must compile the design with the 32-bit version and then "refresh" the
design with the 64-bit version. For example:
Using the 32-bit version of ModelSim:
vlog file1.v file2.v -forcecode -work asic_lib
Next, using the 64-bit version of ModelSim:
vlog -work asic_lib -refresh
This allows you to use either version without having to do a 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."