World Library  
Flag as Inappropriate
Email this Article

Bus contention

Article Id: WHEBN0000376507
Reproduction Date:

Title: Bus contention  
Author: World Heritage Encyclopedia
Language: English
Subject: List of device bit rates, Bus (computing), Three-state bus, Computer bus, Process state
Collection: Computer Buses
Publisher: World Heritage Encyclopedia

Bus contention

Bus contention, in computer design, is an undesirable state of the bus in which more than one device on the bus attempts to place values on the bus at the same time. Most bus architectures require their devices follow an arbitration protocol carefully designed to make the likelihood of contention negligible.[1] However, when devices on the bus have logic errors, manufacturing defects or are driven beyond their design speeds, arbitration may break down and contention may result. Contention may also arise on systems which have a programmable memory mapping and when illegal values are written to the registers controlling the mapping.

Contention can lead to erroneous operation, and in unusual cases, damage to the hardware—such as fusing of the bus wiring.

Bus contention is sometimes countered by buffering the output of memory-mapped devices. However, it has been noted that high impedance from one device will still interfere with the bus values of other devices. Currently, no standard solution exists for data-bus contention between memory devices, such as EEPROM and SRAM.


  1. ^  .
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.