This chapter introduces the basic language elements in VHDL. Before learning the circuit design of the circuits using VHDL, it is important to get familiar with the basic syntax, keywords and the allowed data types of VHDL. First of all, when writing a hardware model in VHDL, it is important to annotate the code with comments. The comment in VHDL is identified by two consecutive dashes (--) followed by a comment text.
-- this is a comment