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Verilog® HDL: A Guide to Digital Design and Synthesis, Second Edition by Samir Palnitkar

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Chapter 1. Overview of Digital Design with Verilog HDL

Evolution of Computer-Aided Digital Design

Digital circuit design has evolved rapidly over the last 25 years. The earliest digital circuits were designed with vacuum tubes and transistors. Integrated circuits were then invented where logic gates were placed on a single chip. The first integrated circuit (IC) chips were SSI (Small Scale Integration) chips where the gate count was very small. As technologies became sophisticated, designers were able to place circuits with hundreds of gates on a chip. These chips were called MSI (Medium Scale Integration) chips. With the advent of LSI (Large Scale Integration), designers could put thousands of gates on a single chip. At this point, design processes ...

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