libraries added in vhdl

[p11]

use work.all;
use work.cf_definitions.all;
use work.fcf_merger_def.all;

how to understand this library and to see the definitions included in library ???????????????

 

[TrickyDicky]

work.all just includes everything compiled into the work library.
cf_definitions and fcf_merger_def are clearly custom packages. You will need to source code for these.

 

[p11]

work.all just includes everything compiled into the work library.
cf_definitions and fcf_merger_def are clearly custom packages. You will need to source code for these.

what is their in work library ? i mean for which kind of functions does it get specially used ?

 

[TrickyDicky]

work is just the default library a unit gets compiled into if nothing else is specified.
It contains nothing unless you compile a file into it.

the code you posted expects the packages cf_definitions and fcf_merger_def to have already been compiled into the work library.

 

[vGoodtimes]

"work" is the default library. Most designs use "work" to refer to your code. Third party code might be compiled into other libraries, like ieee or xilinx or altera or synopsys or etc... This means you can have a work.fifo and a vendor.fifo in the same file.

"work" is a special library. most designs compile all user code into "work" in order to avoid confusion with the nuances of the "work" library, or because there is a lack of understanding of how libraries work in VHDL.