Specifying the resource libraries

VHDL resource libraries

Within a VHDL source file, you can use the VHDL library clause to specify logical names of one or more resource libraries to be referenced in the subsequent design unit. The scope of a library clause includes the text region that starts immediately after the library clause and extends to the end of the declarative region of the associated design unit. It does not extend to the next design unit in the file.

Note that the library clause is not used to specify the working library into which the design unit is placed after compilation; the vcom command adds compiled design units to the current working library. By default, this is the library named work. To change the current working library, you can use vcom -work and specify the name of the desired target library.

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