Hardware Description Language 1 B RAMAMURTHY 01 13 19 HDL 2 Your goal in this class is to be able to design hardware organization of digital processors How do you specify this hardware design or model its components modules instances and interface ports to the external world Using a language that we can easily specify and understand VHDL is a older language Verilog is commonly used 01 13 19 HDL contd 3 As explained in your text The principal feature of a hardware description language is that it contains the capability to describe the function of a piece of hardware independently of the implementation The great advance with modern HDLs was the recognition that a single language could be used to describe the function of the design and also to describe the implementation This allows the entire design process to take place in a single language and thus a single representation of the design 01 13 19 Verilog 4 The Verilog Hardware Description Language usually just called Verilog was designed and first implemented by Phil Moorby at Gateway Design Automation in 1984 and 1985 Verilog simulators are available for most computers at a variety of prices and which have a variety of performance characteristics and features Verilog is more heavily used than ever and it is growing faster than any other hardware description language It has truly become the standard hardware description language 01 13 19 Verilog 5 A Verilog model is composed of modules A module is the basic unit of the model and it may be composed of instances of other modules A module which is composed of other module instances is called a parent module and the instances are called child modules comp1 comp2 system sub 3 01 13 19 Verilog Design Concept 6 System instantiates comp1 comp2 comp2 instantiates sub3 System comp 1 comp 2 sub3 01 13 19