University of Cebu-Banilad Library

Includes bibliographical references and index.

Contents: 1. Number systems and codes -- 2. Boolean algebra -- 3. Logic design principles -- 4. Karnaugh maps and function simplification -- 5. Latches and flip flops -- 6. Counters and registers -- 7. Event driven circuits -- 8. Programmable logic devices.

"Digital electronics is a field of electronics involving the study of digital signals and the engineering of devices that use or produce them.

This is in contrast to analog electronics and analog signals. Digital electronic circuits are usually made from large assemblies of logic gates, often packaged in integrated circuits. Complex devices may have simple electronic representations of Boolean logic functions. A large logic machine (say, with more than a hundred logical variables) can have an astronomical number of possible states. Obviously, factory testing every state of such a machine is unfeasible, for even if testing each state only took a microsecond, there are more possible states than there are microseconds since the universe began! Large logic machines are almost always designed as assemblies of smaller logic machines. To save time, the smaller sub-machines are isolated by permanently installed design for test circuitry, and are tested independently. One common testing scheme provides a test mode that forces some part of the logic machine to enter a test cycle. The test cycle usually exercises large independent parts of the machine.

Digital, or boolean, logic is the fundamental concept underpinning all modern computer systems. Put simply, it's the system of rules that allow us to make extremely complicated decisions based on relatively simple "yes/no" questions. Digital logic circuits can be broken down into two subcategories- combinational and sequential. Combinational logic changes "instantly" the output of the circuit responds as soon as the input changes (with some delay, of course, since the propagation of the signal through the circuit elements takes a little time). Sequential circuits have a clock signal, and changes propagate through stages of the circuit on edges of the clock. Typically, a sequential circuit will be built up of blocks of combinational logic separated by memory elements that are activated by a clock signal. Digital logic is important in programming, as well. Understanding digital logic makes complex decision making possible in programs. The discovery of superconductivity has enabled the development of rapid single flux quantum (RSFQ) circuit technology, which uses Josephson junctions instead of transistors. Most recently, attempts are being made to construct purely optical computing systems capable of processing digital information using nonlinear optical elements.

This comprehensive book is a complete teaching tool for all undergraduate (and possibly graduate) digital logic courses — Lowan Murray."

Adult

Purchased Ortega, Eric College of Computer Studies Computer Science

Text in English