THE WHATIS.COM WORD-OF-THE-DAY May 27, 2002 combinatorial logic ______________ TODAY'S SPONSOR: The .tv Corporation
Save 30% on Web addresses! Not only will you get a great deal on your Web addresses, but you'll also get superior customer service, innovative products and services and a place that is easy to register and manage your Web addresses. Great names are still available. Register the names you want before someone else does! Check it out now: http://WhatIs.com/r/0,,3527,00.htm?the.tvcorporation ______________ TODAY'S WORD: combinatorial logic See our definition with hyperlinks at http://whatis.techtarget.com/definition/0,,sid9_gci826118,00.html Combinatorial logic is a concept in which two or more input states define one or more output states, where the resulting state or states are related by defined rules that are independent of previous states. Each of the inputs and output(s) can attain either of two states: logic 0 (low) or logic 1 (high). A common example is a simple logic gate. In combinatorial logic, the output is a function of the input at a specific time. An example is the AND gate. Suppose an AND gate has two inputs, X and Y, and one output, Z. The AND operation is symbolized by an asterisk (*). The operation of the two-input AND gate can be represented by the following truth table: X Y X*Y 0 0 0 0 1 0 1 0 0 1 1 1 The output of this logic gate is high if and only if both inputs are high. If either or both of the inputs are low, the output is low. If the states of the inputs change periodically, the output always obeys the rules depicted in the above truth table. The current state of the device is not affected by preceding states. This contrasts combinatorial logic with sequential logic, in which the current state of the device is affected by previous states. Logic gates are one of several types of devices that use combinatorial logic. Other forms include encoders, decoders, multiplexers, comparators, and latches. RELATED TERMS: logic gate http://whatis.techtarget.com/definition/0,,sid9_gci213512,00.html sequential logic http://whatis.techtarget.com/definition/0,,sid9_gci826120,00.html ______________________ SELECTED LINKS: Vantis PLD offers a paper in PDF format that discusses the design of combinatorial logic circuits. http://dsml.ecn.purdue.edu/ee362/Refs/Pld/pal_comb.pdf ______________________ QUIZ #26 | Storage Smarts Is it a petabyte, terabyte, exabyte, or megabyte? Which amount of data is the equivalent of more than 300 feature-length movies, 40,000 faxes, 15,000 CDs converted to MP3 at high fidelity, or enough words that it would take every adult in America speaking at the same time for five minutes to say them all? Find out when you take our latest quiz! http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci822242,00.html _________________________________________________________ LESS THAN 4 WEEKS UNTIL OUR FREE SECURITY DECISIONS EVENT Time's running out to attend Security Decisions June 19-21 at the Hilton Chicago Hotel. There are still seats left but you should act now or risk being shut out. FREE attendance available at: http://www.securityconf.com/html/registration.htm Benefit from top strategies to make the most cost-effective security purchases, expert tactics to close specific security holes in your system, and the most effective ways to manage network security (without breaking the bank). Apply today! ______________________________ RECENT ADDITIONS AND UPDATES [1] wall time http://whatis.techtarget.com/definition/0,,sid9_gci826109,00.html [2] lazy loading http://searchvb.techtarget.com/sDefinition/0,,sid8_gci825078,00.html [3] Polish notation http://searchhp.techtarget.com/sDefinition/0,,sid6_gci824619,00.html [4] verbose logging http://searchwindowsmanageability.techtarget.com/sDefinition/0,,sid33_gci823745,00.html [5] Cartesian coordinates http://whatis.techtarget.com/definition/0,,sid9_gci824296,00.html ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: LOWELL THING, Site Editor ([EMAIL PROTECTED]) ____________________________________________________________________ MARGARET ROUSE, Assistant Editor ([EMAIL PROTECTED]) ___________________________________________________________________ :::::::::::::::::::: ABOUT THIS NEWSLETTER ::::::::::::::::::::: Created by TechTarget (http://www.techtarget.com) TechTarget - The Most Targeted IT Media Copyright 2002, All Rights Reserved. If you would like to sponsor this or any techtarget newsletter, please contact Gabrielle DeRussy at [EMAIL PROTECTED] Unsubscribe from 'Word of the Day' - Simply Reply to this Email with REMOVE within the Body or Subject > or - Go to: http://WhatIs.techtarget.com/register - Log in to edit your profile. - Click on the link to Edit email subscriptions. - Uncheck the box next to the newsletter you wish to unsubscribe from. - When finished, click "Save Changes to My Profile."
