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CS 3850. Lecture 1 Overview of Digital Design with Verilog HDL. 1.1 Evolution of Computer Aid Design. Integrated Circuits (IC) __ Logic gates were placed on a single chip SSI: Small Scale Integration ( < 100 gates) MSI: Medium Scale Integration ( < 1000 gates)
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CS 3850 Lecture 1 Overview of Digital Design with Verilog HDL
1.1Evolution of Computer Aid Design • Integrated Circuits (IC) __ Logic gates were placed on a single chip • SSI: Small Scale Integration ( < 100 gates) • MSI: Medium Scale Integration ( < 1000 gates) • LSI: Large Scale Integration ( < 10000 gates) • Design processes very complicated • Computer Aid Design • VLSI: Very Large Scale Integration • > 100,000 gates
1.1Evolution of Computer Aid Design • VLSI: Very Large Scale Integration • > 100,000 gates • CAD: verification and design of VLSI digital circuits • automatic placement and routing of circuit • layout
1.2 Emergence of HDLs • HDL: Hardware Description Language • Verilog HDL: 1983 • VHDL • Describe complex circuits at an abstract level in terms of functionality and data flow • Logic synthesis tools implement the specified functionality in terms of gates and gate interconnections
1.2Emergence of HDLs • HDL used to system- level design and simulation • System boards • Interconnect buses • FPGAs • PALs
1.4 Importance of HDLs • Design can be described at a very abstract level • Functional verification can be done early • Designing is similar to programming
1.5 Popularity of Verilog HDL • Easy to learn and use • Different levels of abstraction can be mixed in the same model • Supported by most popular logic synthesis tools