Design library types

There are two kinds of design libraries: working libraries and resource libraries. A working library is the library into which a design unit is placed after compilation. A resource library contains design units that can be referenced within the design unit being compiled. Only one library can be the working library; in contrast, any number of libraries (including the working library itself) can be resource libraries during a compilation.

The library named work has special attributes within ModelSim; it is predefined in the compiler and need not be declared explicitly (i.e. library work). It is also the library name used by the compiler as the default destination of compiled design units. In other words the work library is the working library. In all other aspects it is the same as any other library.

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