diff -r 89d6a7a84779 -r 25a17d01db0c Symbian3/PDK/Source/GUID-4C5DB74E-41A5-53CB-A053-CBBEADD31AFF.dita
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-4C5DB74E-41A5-53CB-A053-CBBEADD31AFF.dita	Fri Jan 22 18:26:19 2010 +0000
@@ -0,0 +1,31 @@
+<?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-4C5DB74E-41A5-53CB-A053-CBBEADD31AFF" xml:lang="en"><title>Architecture</title><shortdesc>Describes the architecture of the DMA Framework.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The following diagram shows the main parts of the architecture: </p>
+<fig id="GUID-E25AE30D-8EC9-530F-BD3C-FF4D6E5B9049">
+<image href="GUID-AC7830F9-C3FB-5117-B851-1D106AE400D4_d0e367685_href.png" placement="inline"/>
+</fig>
+<p>The DMA Framework is implemented as a single DLL, which is split into two
+layers: </p>
+<ul>
+<li id="GUID-FE402AA7-2E91-56F2-9424-7ADCB30E5D43"><p>a platform independent
+layer that implements the behaviour that is common to all hardware </p> </li>
+<li id="GUID-3EB73B07-D1BF-5D05-957D-6DB8A3F3D4F2"><p>a platform specific
+layer that implements the behaviour that is specific to a particular platform. </p> </li>
+</ul>
+<p>The DLL is called <filepath>dma.dll</filepath>, and is implemented as a
+kernel extension, which means that it is loaded very early during system initialisation. </p>
+<p>The platform specific layer interfaces to the DMA controller hardware via
+the I/O port constants and functions exposed by the ASSP DLL and/or Variant
+DLL. </p>
+<p>The clients of the DMA Framework are physical device drivers (PDD). </p>
+</conbody></concept>
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