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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-D089C2E9-1BE4-4B37-B8A8-21E5B2425E6C" xml:lang="en"><title>SDIO

    13 Technology Guide</title><shortdesc>Provides information about the concepts and the uses of the SDIO

    14 card.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    15 <section id="GUID-075122CD-EA1E-4567-9D0F-5DFA548DA883">       <title>Purpose</title> 

    16      <p>The Secure Digital Input/Output (SDIO) protocol is based on the SD

    17 memory card protocols. The SDIO bus enables high speed data transfers between

    18 the host and a card. The SDIO consumes low power and is efficient for use

    19 in mobile devices. SDIO cards like SD cards use star topology that have dedicated

    20 command and data signals. The purpose of the SDIO APIs is to enable easy porting

    21 of the Symbian SDIO services for a particular SDIO controller.</p> 

    22    </section>

    23 <section id="GUID-57C125FF-4196-40D7-B1E5-DDA292076916"><title>Key concepts</title><ul>

    24 <li><p><b>SDIO controller:</b></p> is the executable that manages access to

    25 the SDIO card hardware interface and provides an API for class drivers to

    26 access SDIO card functions.</li>

    27 </ul><ul>

    28 <li><p><b> Stack:</b></p>handles multiple requests simultaneously.  It internally

    29 schedules the requests on to the bus and allocates the appropriate card to

    30 transfer data accordingly.</li>

    31 </ul><ul>

    32 <li><p><b>Session:</b></p> sets up a session object to perform SDIO specific

    33 command sequences.</li>

    34 </ul><ul>

    35 <li><p><b>Register interface:</b></p> allows single byte read/write operations

    36 to a given register address together with the corresponding ones for multi-byte

    37 access. </li>

    38 </ul></section>

    39 <section id="GUID-16D2B044-0E5A-4126-ADAC-B297C4B616F8"><title>Typical Uses</title><ul>

    40 <li><p>Powering up stack containing a single SDIO Card.</p></li>

    41 <li><p>Sending a command to PSL.</p></li>

    42 <li><p>Acquiring new cards into the SDIO stack.</p></li>

    43 <li><p>Configuring an SDIO card.</p></li>

    44 </ul></section>

    45 </conbody></concept>