VHDL Programs for Digital Logic Gates and Circuits: Study Guide

Summary

VHDL programs for digital logic gates and circuits are described. Students see how to write code for various logic gates, adders, multiplexers, shift registers and converters.

Basic Logic Gates

The NOT gate is explained. VHDL code for AND, OR, XOR, NAND, NOR and XNOR gates is shown. These are basic building blocks of digital circuits.

Combinational Circuits

A half adder is described. VHDL programs for a multiplexer and a demultiplexer are given. These circuits combine multiple logic gates.

Sequential Circuits

A parallel-in serial-out shift register is described. VHDL code for a serial-in parallel-out shift register is shown. These circuits have memory.

Counters and Converters

A decade counter is described. VHDL code for a binary-to-Gray converter is shown. These circuits count or change the format of digital signals.

Key terms

VHDL

A hardware description language for digital circuits.

Logic gates

Basic building blocks of digital circuits.

Half adder

A combinational circuit that adds two binary digits.

Shift register

A sequential circuit that shifts digital data.

Dataflow modelling

A way of describing digital circuits using concurrent statements.

Structural modelling

A way of describing digital circuits using components and ports.

Questions this document helps with

• How do you write VHDL code for a NOT gate?
• What is a half adder and how does it work?
• How do you implement a shift register in VHDL?

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