Modelsim: compiling into libraries

Thank u for your answer,

yes, i'm a little bit confused. :)

So if I want to write:

library work;

use work.lib_one.all;

how have I to map the library lib_one?

Have I to map it into work library?

I think you might be getting a bit confused. In VHDL, you have packages, which are part of a library. The standard format is:

library lib;

use lib.package.all;

The libraries do not have to be in any specific directory. The libraries just contain compiled code. Any code can go wherever you want to put it. But inside a library, local bits can be referenced via work (rather than specifying the library name). This allows the whole library to reference itself while you are free to call it whatever you want.

So in modesim, the libaries are created with the vlib command:

vlib some_library;

Then to compile code into a specific library, you can specify which library is the work library for that file:

vcom some_file.vhd -work some_library_path

some_library should be the path of the working directory for some_library.

If you already have a completly compiled library, you can use vmap to add a library to your work directory:

vlib some_library

vmap some_library some_library_path

(some_library_path will usually end with /work, because locally the directory is /work)

So basically, the answer to the questions is:

1. The compilation of the files, but you can work locally in a library with the files in then use vmap from another directory.

2. See above (use the -work option on vcom)

3. you are confused. the work.lib_one.all has nothing to do with file paths. It is the libary paths of compiled code.