<?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>