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Adaptation/GUID-058BAEDF-5E04-5BB4-928F-0E0528FD9465.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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Initial contribution of the Adaptation Documentation.
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-058BAEDF-5E04-5BB4-928F-0E0528FD9465" xml:lang="en"><title>MultiMediaCard
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Technology</title><shortdesc>MultiMediaCard (MMC) is a low cost data storage and communication
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media, and is defined by the <i>MultiMediaCard System Specification</i></shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p> The MMC specification is published by the <xref href="http://www.mmca.org" scope="external">MultiMediaCard Association</xref>. </p>
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<p>Communication is based on a 7-pin serial bus designed to operate in a low
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voltage range (2.0 - 3.6V). The MultiMediaCard specification defines a communication
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protocol referred to as MMC mode (0-20MHz). In addition, for compatibility
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with existing controllers, MultiMediaCards may offer an alternative communication
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protocol which is based on the SPI standard (0-5MHz). </p>
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<section id="GUID-69DA6510-AF66-566A-9B19-5554B4743D0B"><title> Omissions</title> <p>The
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following features of the MultiMediaCard System Specification are not provided
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in the Symbian platform MultiMediaCard controller: </p> <ul>
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<li id="GUID-75439A4B-28C8-58A6-81A8-92BF08F490A1"><p>Stream read and write
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operations are not supported. </p> </li>
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<li id="GUID-85C665FB-152C-5A94-A245-E99D44F384C2"><p>SPI bus mode is not
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supported. </p> </li>
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<li id="GUID-26F8D809-57EF-5CCB-99A5-BFDCA59A5F76"><p>The MultiMediaCard System
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Specification includes a feature where a MultiMediaCard can be put into a
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disconnected state. This can be performed on a card which is currently in
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the programming state, i.e. writing data to the disk. To place that card into
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the disconnected state involves placing another card into the transfer state,
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which means giving the other card the current data transfer focus. A disconnected
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card will not terminate the programming operation and, if re-selected, moves
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back to the programming state. The Symbian platform MultiMediaCard controller
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does not support this mode of operation even if the underlying hardware interface
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does. </p> </li>
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</ul> </section>
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</conbody></concept>
MCL/sftools/depl/docscontent