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<!DOCTYPE HTML PUBLIC "-//Norman Walsh//DTD DocBook HTML 1.0//EN"><HTML><HEAD><TITLE>Host Controllers</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet"><LINKREL="HOME"TITLE="The Linux USB sub-system"HREF="book1.html"><LINKREL="UP"TITLE="USB Introduction"HREF="c15.html"><LINKREL="PREVIOUS"TITLE="USB Introduction"HREF="c15.html"><LINKREL="NEXT"TITLE="USB Devices and Transfer Characteristics"HREF="x33.html"></HEAD><BODY><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">The Linux USB sub-system</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="c15.html">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 1. USB Introduction</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="x33.html">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="AEN29">Host Controllers</A></H1><P>Most modern motherboard chipsets provide a USB host controller. Older machineswhich are not equipped with a USB host controller can be upgraded using a PCIcards with a host controller built in. </P><P>USB host controllers arecompatible with either the Open Host Controller Interface (OHCI, by Compaq) orthe Universal Host Controller Interface (UHCI, by Intel) standard. Both typeshave the same capabilities and USB devices work with both host controllertypes. Basically the hardware of UHCI is simpler and therefore it ischeaper, but needs a more complex device driver, which could cause slightlymore CPU load. </P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="c15.html">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="book1.html">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="x33.html">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">USB Introduction</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="c15.html">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">USB Devices and Transfer Characteristics</TD></TR></TABLE></DIV></BODY></HTML>

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