This slide shows an example of the component declaration residing
inside a package declaration. The package must be included in
the file containing the architecture. This is done with the use of the
USE statement. The USE statement can be read as follows.
Use ALL components contained in the package my_stuff
where the package my_stuff is contained in the library
work. If the only element required from this package was
and_gate, then the USE statement could have been written:
USE Work.my_stuff.and_gate
Also shown on this slide is the use of positional association.
Positional association is used in the PORT MAP statement shown
resulting in signals S1, S2, and S3 being mapped
to in1, in2, and out1, respectively. Association
by name could also be used and the statement may have been:
PORT MAP (in1 => S1, out1 => S3, in2 => S2);
Note that when using association by name, the order of the signals in
the PORT MAP is not important.
