Introduction - If you have any usage issues, please Google them yourself
The purpose of this tutorial is to describe the modeling language VHDL. VHDL includes
facilities for describing logical structure and function of digital systems at a
number of levels of abstraction, from system level down to the gate level. It is intended,
among other things, as a modeling language for specification and simulation. We
can also use it for hardware synthesis if we restrict ourselves to a subset that can be
automatically translated into hardware.