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+++ b/Symbian3/PDK/Source/GUID-D089C2E9-1BE4-4B37-B8A8-21E5B2425E6C.dita	Tue Mar 30 11:56:28 2010 +0100
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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-D089C2E9-1BE4-4B37-B8A8-21E5B2425E6C" xml:lang="en"><title>SDIO
+Technology Guide</title><shortdesc>Provides information about the concepts and the uses of the SDIO
+card.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<section id="GUID-075122CD-EA1E-4567-9D0F-5DFA548DA883">       <title>Purpose</title> 
+     <p>The Secure Digital Input/Output (SDIO) is based on the SD memory cards.
+The SDIO cards enable high speed data transfers between two SD devices. The
+SDIO consumes low power and is efficient to be used in the mobile devices.
+The SDIO cards are designed as a super set of SD cards and uses start topology.
+The SDIO card controllers support the SDIO cards with or without the memory.
+The purpose of the SDIO SHAI is to enable easy development of the SDIO card
+controllers.</p>     </section>
+<section id="GUID-57C125FF-4196-40D7-B1E5-DDA292076916"><title>Key concepts</title><ul>
+<li><p><b>SDIO controller:</b></p> implements functions needed for peripherals
+to comply with the SDIO standard and to connect to SDIO host devices. It also
+manages access to the SDIO card hardware interface and provides an API for
+class drivers to access SDIO card functions.</li>
+</ul><ul>
+<li><p><b> Stack:</b></p> handles multiple requests simultaneously.  It internally
+schedules the requests onto the bus and allocates the appropriate card to
+transfer data accordingly.</li>
+</ul><ul>
+<li><p><b>Session:</b></p> sets up a session object to perform SDIO specific
+command sequences.</li>
+</ul><ul>
+<li><p><b>Interface:</b></p> allow single byte read/write operations to a
+given register address together with the corresponding ones for multi-byte
+access. </li>
+</ul></section>
+<section id="GUID-16D2B044-0E5A-4126-ADAC-B297C4B616F8"><title>Typical Uses</title><ul>
+<li><p>Powering up stack containing a single SDIO Card.</p></li>
+<li><p>Sending a command to PSL.</p></li>
+<li><p>Acquiring new cards into the SDIO stack.</p></li>
+<li><p>Configuring an SDIO card.</p></li>
+</ul></section>
+</conbody></concept>
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