This class is a general introduction to the Verilog language and its use in programmable logic design, covering the basic constructs used in both the simulation. Verilog HDL is one of the two most common Hardware Description Languages (HDL) used by integrated circuit (IC) designers. The other one is VHDL. HDL's allows the design to be simulated earlier in the design cycle in order to correct errors or experiment with different architectures. INTRODUCTION TO VERILOG HDL. Presented by. What is verilog? Verilog is a HDL- hardware description language to design the digital system.


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Create a basic Verilog module Understand the difference between simulation and synthesis environments Understand Verilog data types and operators and their uses Model hardware and test using behavioral modeling constructs Model hardware and test using structural modeling constructs Skills Required Background in digital logic design Knowledge of simulation is a plus Prior knowledge of a programming language e.

The keyword reg does not necessarily imply introduction to verilog hdl hardware register. Definition of constants[ edit ] The definition of constants in Verilog supports the addition of a width parameter.

Introduction to Verilog HDL (IHDL120)

The basic syntax is: Consequently, much of the language can not be used to describe hardware. The examples presented here are the classic subset of the language that has a direct mapping to real gates.

The output introduction to verilog hdl remain stable regardless of the input signal while the gate is set to "hold". In the example below the "pass-through" level of the gate would be when the value of introduction to verilog hdl if clause is true, i. The flip-flop is the next significant template; in Verilog, the D-flop is the simplest, and it can be modeled as: A variant of the D-flop is one with an asynchronous reset; there is a convention that the reset state will be the first if clause within the statement.

Consider the following test sequence of events.

Assume no setup and hold violations. In this example the always statement would first execute when the rising edge of reset occurs which would place q to a value of 0.

The next time the always block executes would be introduction to verilog hdl rising edge of clk which again would keep q at a value of 0.

The always block then executes when set goes high which because reset is high forces q to remain at 0. This condition may or may not be correct depending on the actual flip flop.


However, this is not the main problem with this model. Notice that when reset goes low, that set is still high.

In a real flip flop this will cause the output to go to a 1. However, in this model it will not occur because the always block is triggered by rising edges of set and reset — not levels.

Introduction to Verilog HDL

The final basic variant is one that implements a D-flop with a mux feeding its input. The mux has a d-input and feedback from the flop itself.

This allows a gated load introduction to verilog hdl. FPGA tools allow initial blocks where reg values are established instead of using a "reset" signal. ASIC synthesis tools don't support such a statement.

An ASIC is an actual hardware implementation. Initial and always[ edit ] There are two separate ways of declaring a Verilog process. These are the always and the initial keywords. The always keyword indicates a free-running process.

The initial keyword indicates a process introduction to verilog hdl exactly once. This RTL description is simulated to test functionality. From here onwards we need the help of EDA tools.

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