In this and the next few slides, we will describe the queuing system
ADT and show how to use the ADT to create and exercise the model
presented in the previous slide.
The queue_pkg package contains a number of functions useful for
the queuing system component including overloaded read and
write procedures.
Since we assume there are no system inputs and outputs, the entity
open_system has no ports.
The architecture has three basic parts: 1) a signal list declaration
which declares all signals used to connect the components together to
create the queuing network, 2) the declarations of the queuing system
components (i.e., sources, sink, forks, joins, queue, and servers),
and 3) the body which here will be little more than a netlist of
components.
