Digital VLSI Design and Simulation with Verilog

3 Introduction to Verilog HDL

3.1 Basics of Verilog HDL

Verilog is a type of hardware description language (HDL). This language is used to describe the hardware for the purpose of simulation, synthesis, and implementation. Verilog describes a circuit as an N/W switch, ROM, RAM, micro-controller, micro-processors, and other combinational and sequential circuits [1–2]. HDLs can be described at any level of abstraction.

3.1.1 Introduction to VLSI

Very large-scale integration (VLSI) is a type of integration. Millions of transistors are fabricated in one single IC under this category. Microprocessors and micro-controllers also come under this VLSI category. Due to the complexity of the circuitry, these types of circuits are not possible to verify, fabricate, or breadboard. These circuits require a special type of tool or software for verification and fabrication. It is very difficult to design computer-aided techniques (CAD) with VLSI digital circuits. Therefore, VLSI-CAD has been introduced to solve these types of complexity.

3.1.2 Analog and Digital VLSI

VLSI is also an HDL. It is used to simulate digital and analog signals. But here, we will discuss only digital design. Analysis and design of analog mixed signal (AMS) is not included in this book. The basics of design and analysis of HDLs are described in this chapter.

3.1.3 Machine Language and HDLs

Machine language and HDLs are those languages used in digital design to perform all types of operations. We know that all ...