Micron Document
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<title>XIO</title>
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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">XIO</span></span>
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</style><table class="infobox"><caption class="infobox-title">XIO</caption><tbody><tr><td colspan="2" class="infobox-subheader">XIO</td></tr><tr><th scope="row" class="infobox-label">Created by</th><td class="infobox-data"><a href="Silicon_Graphics" title="Silicon Graphics">Silicon Graphics</a></td></tr><tr><th scope="row" class="infobox-label">Supersedes</th><td class="infobox-data"><a href="GIO" title="GIO">GIO</a></td></tr><tr><th scope="row" class="infobox-label">Width in bits</th><td class="infobox-data">128 (data)<br>32 (control)<br>8 or 16 per channel</td></tr><tr><th scope="row" class="infobox-label">Speed</th><td class="infobox-data">up to 800&nbsp;MB/s at 400&nbsp;MHz</td></tr><tr><th scope="row" class="infobox-label">Hotplugging interface</th><td class="infobox-data">Optional</td></tr></tbody></table>
<p><b>XIO</b> is a packet-based, high-performance <a href="Computer_bus" class="mw-redirect" title="Computer bus">computer bus</a> employed by the <a href="SGI_Origin_2000" title="SGI Origin 2000">SGI Origin 2000</a>, <a href="SGI_Octane" title="SGI Octane">Octane</a>, <a href="SGI_Altix" class="mw-redirect" title="SGI Altix">Altix</a>, <a href="SGI_Fuel" title="SGI Fuel">Fuel</a> and <a href="SGI_Tezro" title="SGI Tezro">Tezro</a> machines. The XIO forms a bus between high-performance system devices and the <a href="Memory_controller" title="Memory controller">memory controller</a>.
</p><p>XIO is usually used in a star topology, using a <a href="Router_(computing)" title="Router (computing)">router</a> <a href="Application_specific_integrated_circuit" class="mw-redirect" title="Application specific integrated circuit">ASIC</a> called Crossbow (Xbow) to connect up to eight fully symmetrical devices in a system (one of them is usually the memory controller / <a href="Central_processing_unit" title="Central processing unit">CPU</a> bridge, called HEART in Octane or Hub in Origin). Other devices known to have XIO interfaces are:
</p>
<ul><li>BRIDGE: XIO to PCI-64 bridge (Octane, Origin)</li>
<li>XBRIDGE: XIO to PCI-X bridge (Altix)</li>
<li>HQ4: command processor of ImpactSR cards (Octane)</li>
<li>KTOWN: frontend for InfiniteReality2 cards (Onyx, Origin variation)</li>
<li>XC: Crosstown converter</li>
<li>BUZZ: "OpenGL-on-a-Chip" ASIC used in <a href="SGI_VPro" title="SGI VPro">ODYSSEY/VPro graphics</a> (V6/V8/V10/V12)</li></ul>
<p>The XIO employs two <a href="Source-synchronous" title="Source-synchronous">source-synchronous</a> channels (one in each direction), each 8 or 16 bits wide. They are clocked at 400&nbsp;MHz to achieve peak rates of 800&nbsp;MB/s (i.e. in megabytes). Each of the devices can utilize the full bandwidth, as the XBow router prevents collisions by being able to route between any two points.
</p><p>Transfer is organized into micropackets. These contain a total of 128 bits of data and 32 bits of control. The control information encapsulates an 8 bit sideband (used by higher layers for framing), sequence numbers (for go-back-n link-layer retransmissions) and check bits (<a href="Cyclic_redundancy_check" title="Cyclic redundancy check">CRC</a>-16).
</p><p>It is probable that XIO uses STL (which SGI likes to call <i>SGI transistor logic</i>) low-voltage single-ended I/O standard.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> CrossTown is a version of XIO utilizing <a href="Positive_Referenced_Emitter_Coupled_Logic" class="mw-redirect" title="Positive Referenced Emitter Coupled Logic">PECL</a> for differential I/O standard (like <a href="NUMAlink" title="NUMAlink">NUMAlink</a>) for longer connections.
</p><p>Higher-level encapsulation differs from NUMAlink (like used to connect HUB chips in Origin-series machines). It is well suited for short memory transactions.
</p><p>XIO uses very delicate compression connectors, which should be handled with extreme care.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120327073311/http://techpubs.sgi.com:80/library/tpl/cgi-bin/getdoc.cgi?coll=0650&amp;db=bks&amp;fname=/SGI_Developer/OrOn2_Theops/go01.html">"IRIX 6.5: Developer/OrOn2_Theops - Glossary"</a>. <i>SGI TechPubs Library</i>. 1998-06-15. Archived from <a rel="nofollow" class="external text" href="http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&amp;db=bks&amp;fname=/SGI_Developer/OrOn2_Theops/go01.html">the original</a> on 2012-03-27.</cite></span>
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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140102235419/http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&amp;db=bks&amp;srch=&amp;fname=/SGI_EndUser/Octane_OG/sgi_html/ch05.html">"IRIX 6.5: End-User/Octane_OG - Chapter 5. Installing and Removing XIO Graphics and Option Boards"</a>. <i>SGI TechPubs Library</i>. 2002-07-17. Archived from <a rel="nofollow" class="external text" href="https://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&amp;db=bks&amp;srch=&amp;fname=/SGI_EndUser/Octane_OG/sgi_html/ch05.html">the original</a> on 2014-01-02.</cite></span>
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</style><div id="Silicon_Graphics143" style="font-size:114%;margin:0 4em">Silicon Graphics</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Company</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Silicon_Graphics" title="Silicon Graphics">Silicon Graphics</a> (1981–2009)</li>
<li><a href="Silicon_Graphics_International" title="Silicon Graphics International">Silicon Graphics International</a> (2009–2016)</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Kurt_Akeley" title="Kurt Akeley">Kurt Akeley</a></li>
<li><a href="Rick_Belluzzo" class="mw-redirect" title="Rick Belluzzo">Rick Belluzzo</a></li>
<li><a href="David_J._Brown_(computer_scientist)" title="David J. Brown (computer scientist)">David J. Brown</a></li>
<li><a href="James_H._Clark" title="James H. Clark">James H. Clark</a></li>
<li><a href="Paul_Haeberli" title="Paul Haeberli">Paul Haeberli</a></li>
<li><a href="Marc_Hannah" title="Marc Hannah">Marc Hannah</a></li>
<li><a href="Herb_Kuta" class="mw-redirect" title="Herb Kuta">Herb Kuta</a></li>
<li><a href="Abbey_Silverstone" title="Abbey Silverstone">Abbey Silverstone</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Acquisitions</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Alias_Systems_Corporation" title="Alias Systems Corporation">Alias Research</a></li>
<li><a href="Cray" title="Cray">Cray</a></li>
<li><a href="Kroyer_Films" title="Kroyer Films">Kroyer Films</a></li>
<li><a href="Softimage_3D" title="Softimage 3D">Softimage 3D</a></li>
<li><a href="Wavefront_Technologies" title="Wavefront Technologies">Wavefront Technologies</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Computer_architecture" title="Computer architecture">Computer<br>architectures</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Motorola_68000_series" title="Motorola 68000 series">Motorola 68000</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="SGI_IRIS" title="SGI IRIS">SGI IRIS</a> (former models)</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="MIPS_architecture" title="MIPS architecture">MIPS</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="SGI_IRIS_4D" class="mw-redirect" title="SGI IRIS 4D">IRIS 4D</a></li>
<li><a href="SGI_Indigo" title="SGI Indigo">Indigo</a></li>
<li><a href="SGI_Indigo%C2%B2_and_Challenge_M" title="SGI Indigo² and Challenge M">Indigo² and Challenge M</a></li>
<li><a href="SGI_Indy" title="SGI Indy">Indy</a></li>
<li><a href="SGI_Crimson" title="SGI Crimson">Crimson</a></li>
<li><a href="SGI_O2" title="SGI O2">O2</a></li>
<li><a href="SGI_Octane" title="SGI Octane">Octane</a></li>
<li><a href="SGI_Challenge" title="SGI Challenge">Challenge</a></li>
<li><a href="SGI_Onyx" title="SGI Onyx">Onyx</a></li>
<li><a href="SGI_Origin_200" title="SGI Origin 200">Origin 200</a></li>
<li><a href="SGI_Origin_2000" title="SGI Origin 2000">Origin 2000</a></li>
<li><a href="SGI_Onyx2" title="SGI Onyx2">Onyx2</a></li>
<li><a href="SGI_Origin_3000_and_Onyx_3000" title="SGI Origin 3000 and Onyx 3000">Origin and Onyx 3000</a></li>
<li><a href="SGI_Fuel" title="SGI Fuel">Fuel</a></li>
<li><a href="SGI_Tezro" title="SGI Tezro">Tezro</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="IA-32" title="IA-32">IA-32</a>, <a href="Itanium" title="Itanium">Itanium</a>, <a href="X86-64" title="X86-64">x86-64</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="SGI_Visual_Workstation" title="SGI Visual Workstation">Visual Workstation</a></li>
<li><a href="Altix" title="Altix">Altix</a></li>
<li><a href="SGI_Prism" title="SGI Prism">Prism</a></li>
<li><a href="SGI_Virtu" title="SGI Virtu">Virtu</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Graphics_hardware" title="Graphics hardware">Graphics hardware</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Geometry_Engine" class="mw-redirect" title="Geometry Engine">Geometry Engine</a></li>
<li><a href="Elan_Graphics" title="Elan Graphics">Elan</a></li>
<li><a href="Extreme_Graphics" title="Extreme Graphics">Extreme</a></li>
<li><a href="IMPACT_(computer_graphics)" title="IMPACT (computer graphics)">Impact</a></li>
<li><a href="SGI_VPro" title="SGI VPro">VPro</a></li>
<li><a href="RealityEngine" title="RealityEngine">RealityEngine</a></li>
<li><a href="InfiniteReality" title="InfiniteReality">InfiniteReality</a></li>
<li><a href="IrisVision" title="IrisVision">IrisVision</a></li>
<li><a href="Reality_Coprocessor" class="mw-redirect" title="Reality Coprocessor">Reality Coprocessor</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Monitors</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="SGI_1600SW" title="SGI 1600SW">1600SW</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related technologies</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="IRIX" title="IRIX">IRIX</a></li>
<li><a href="Silicon_Graphics_Image" title="Silicon Graphics Image">Image format</a></li>
<li><a href="MEX_(windowing_system)" title="MEX (windowing system)">MEX</a></li>
<li><a href="IRIS_WorkSpace" title="IRIS WorkSpace">WorkSpace</a></li>
<li><a href="IRIX_Interactive_Desktop" title="IRIX Interactive Desktop">Interactive Desktop</a></li>
<li><a href="Xsgi" title="Xsgi">Xsgi</a></li>
<li><a href="XFS" title="XFS">XFS</a></li>
<li><a href="IRIS_GL" title="IRIS GL">IRIS GL</a></li>
<li><a href="OpenGL" title="OpenGL">OpenGL</a></li>
<li><a href="OpenLDI" title="OpenLDI">OpenLDI</a></li>
<li><a href="GIO" title="GIO">GIO</a></li>

<li><a href="NUMAlink" title="NUMAlink">NUMAlink</a></li>
<li><a href="Nintendo_64" title="Nintendo 64">Nintendo 64</a></li></ul>
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