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Adaptation/GUID-092D336A-155A-4F18-AAF7-92E08473700E.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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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-092D336A-155A-4F18-AAF7-92E08473700E" xml:lang="en"><title>DMA Overview</title><shortdesc>Direct Memory Access (DMA) uses a controller to copy data
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between memory locations, or between memory and peripherals with minimal
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involvement from the CPU.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-04298BEC-F064-40C4-9A8C-DFB15953C85B"><title>Purpose</title><p>Direct Memory Access (DMA) channels allow you to copy data between
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memory locations, or between memory and peripherals, while minimizing
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the use of  the CPU. The transfer operation is performed in hardware
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by the DMA controller. The purpose of the DMA platform service is
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to provide a common interface between hardware and device drivers
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which use DMA.</p><p>The framework is divided into a platform-independent
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layer and a platform-specific layer, with the DMA platform service
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being the interface between the two. The framework presents an API
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for use by device drivers and other client applications which transfer
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data by DMA. The PSL must be implemented by hardware developers to
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provide the same functionality on multiple platforms.</p></section>
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<section id="GUID-140D36E7-EFC1-4206-A563-417AAB6BCC1C"><title>Architecture</title><p><fig id="GUID-0EF82751-1A74-4A39-BA92-E7E8F441E7F7">
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<title>DMA Framework</title>
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<image href="GUID-A6845EB0-4B4D-49C8-85A5-A933A2C351CF_d0e89230_href.png" placement="inline"/>
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</fig></p></section>
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</conbody></concept>
MCL/sftools/depl/docscontent