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Introduction to Digital Systems: Modeling, Synthesis, and Simulation Using VHDL
book

Introduction to Digital Systems: Modeling, Synthesis, and Simulation Using VHDL

by Mohammed Ferdjallah
July 2011
Intermediate to advanced content levelIntermediate to advanced
225 pages
6h 22m
English
Wiley
Content preview from Introduction to Digital Systems: Modeling, Synthesis, and Simulation Using VHDL

3.5 BASIC LOGIC GATES AND TRUTH TABLES

Logic expressions describe an output as a function of the input and are called logic functions. In the digital world, logic gates are used to implement logic functions. There are seven types of logic gates: NOT, AND, OR, NAND, NOR, XOR, and NXOR. These circuit diagrams are symbolic representations of their corresponding logic functions (Figures 3.1 and 3.2).

The logic gates of AND, OR, XOR, NAND, NOR, and NXOR may have more than two inputs. The circuits in Figure 3.3 illustrate multi-input AND and OR logic gates.

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Publisher Resources

ISBN: 9780470900550Purchase book