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What is HDL?, , ® hardware description language describes the, hardware of digital systems in textual form., , ® One can design any hardware at any level, ® Simulation of designs before fabrication, , ® With the advent of VLSI, it is not possible to verify a, complex design with millions of gates on a, breadboard, HDLs came into existence to verify the, functionality of these circuits.

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~ Most Commonly used HDLs, , ® Verilog, , ® Verilog HDL is commonly used in the US industry, Major digital design companies in Pakistan use, Verilog HDL as their primary choice., , ® most commonly used in the design, verification, and, implementation of digital logic chips, , ® VHDL (VHSIC (Very High Speed Integrated Circuits) hardware, description language), , ® VHDL is more popular in Europe., , ® commonly used as a design-entry language for fieldprogrammable gate arrays. Field-Programmable Gate, Array is a type of logic chip that can be programmed.

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Levels of Abstraction, , There are four different levels of abstraction in verilog:, , ® Behavioral /Algorithmic, ® Data flow, , ® Gate level, , ® Switch level., , We will cover Gate level, Data flow and Behavioral, Level modeling

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Getting started..., , A verilog program for a particular application consists, of two blocks, , ® Design Block (Module), © Testing Block (Stimulus)