author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 16 Jul 2010 17:23:46 +0100 | |
changeset 12 | 80ef3a206772 |
parent 9 | 59758314f811 |
child 14 | 578be2adaf3e |
permissions | -rw-r--r-- |
9
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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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. --> |
59758314f811
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<!-- This component and the accompanying materials are made available under the terms of the License |
59758314f811
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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: |
59758314f811
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Nokia Corporation - initial contribution. |
59758314f811
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Contributors: |
59758314f811
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--> |
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<!DOCTYPE concept |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-114A23CF-BF8B-54F5-8AF6-FEF007891884" xml:lang="en"><title>SD Controller </title><shortdesc>Describes the Secure Digital (SD) controller supported on the Symbian |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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platform. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The SD controller provided by the Symbian platform is based on the <xref href="http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf" scope="external">Physical Layer Simplified Specification Version 2.00</xref> from |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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the SD Card Association. </p> |
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<section id="GUID-8A734E8C-CB18-48C8-9C8F-71AA6693B782"><title>Introduction</title> <p>The |
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Secure Digital (SD) card protocol is implemented as a super–set of multimedia |
59758314f811
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cards on the Symbian platform. The Multi Media Card (MMC) controller also |
59758314f811
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supports the SD cards. The SD card controller functionality is very similar |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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to the MMC controller and hence the SD card controller is provided by a set |
59758314f811
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of SD card classes which are derived from the MMC controller classes. </p> </section> |
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<section id="GUID-D41588EF-12DA-5E50-8FF4-FCE13CA81409"><title>SD Card</title> <p>The |
59758314f811
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SD cards are flash based memory cards used in high capacity data storage in |
59758314f811
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handheld devices like digital cameras, mobile phones and PDAs. The SD cards |
59758314f811
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contain 9 pins and support a 4-bit data bus. SD cards are forward compatible |
59758314f811
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with MMC and hence a device with SD card support will also support MMC cards. |
59758314f811
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SD cards use star topology with dedicated command and data signals. </p> <p>There |
59758314f811
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are two versions of SD cards: the standard capacity SD card which has a memory |
59758314f811
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capacity of up to 2GB; and high capacity SD cards which have a maximum memory |
59758314f811
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capacity of up to 32GB. The SD card functionality is provided by a layered |
59758314f811
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architecture. The 3 layers are: </p> <ul> |
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<li id="GUID-86ED75DF-68C4-5D0A-B11F-C9B52CEEC6ED"><p>File System Layer provides |
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high level file operations </p> </li> |
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<li id="GUID-3741FA6C-6324-59CB-B460-5BF38C87C260"><p>Media Driver layer provides |
59758314f811
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an interface to the file system and enables low level file operations like |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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read and write to a storage area </p> </li> |
59758314f811
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<li id="GUID-2F9CA759-FCE0-57FB-B7C4-5B93D94CAEF3"><p>SD controller provides |
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the low level data operations </p> </li> |
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</ul> <p>The SD card stack is responsible for sending the command sequences |
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to enable the communication between the SD card and file system of the Symbian |
59758314f811
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platform. </p> </section> |
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<section id="GUID-D53D0828-5579-4A4B-A611-395A3CBB34E4"><title>SD Card Controller</title> <p>The <xref href="GUID-F3BD37EC-0CCB-5859-908F-215E22C9FC20.dita">File Server</xref> uses the <xref href="GUID-2F114BC9-9B5D-5989-9CF3-37A43377DC58.dita">Media Driver</xref> to access |
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user data from the SD cards. The Multi Media Card (MMC) Media Driver supports |
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the SD cards on the Symbian platform. The MMC media drivers are implemented |
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in <filepath>MEDMMC.PDD</filepath>. The Media Driver uses the services of |
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the SD controller. The SD controller is implemented as a peripheral bus controller |
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in <filepath>EPBUSSD.DLL </filepath> to support SD cards. The difference between |
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Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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the MMC controller and the SD controller is the default partition information |
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and the initialization sequence used. The main functions of an SD controller |
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are : </p> <ul> |
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<li id="GUID-9F6B9620-8F40-532E-88AD-DEDDC1BD1A03"><p>Support the SD memory |
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card initialization protocol. </p> </li> |
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<li id="GUID-EAD5FB6D-8DBB-53E2-A895-13539C73F002"><p>Reading and writing |
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one or more blocks from/to an SD memory card. </p> </li> |
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<li id="GUID-022E3749-1739-58ED-B875-343B7048E4BA"><p>Support for 4-bit wide |
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data bus option </p> </li> |
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<li id="GUID-D30CAD38-3897-5899-8761-A1DEB3DBDB92"><p>Support for Erase commands |
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on SD cards </p> </li> |
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</ul> <p>The SD controller first detects the card present in the card port. |
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There can be more than one card port available in a device. When more than |
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one card is present, the controller switches between the ports to identify |
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them. When it detects an SD card, the SD card initialization protocol is loaded. |
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The initialization protocol is a sequence of commands as described in the <xref href="http://www.sdcard.org/developers/tech/sdcard/pls/Simplified_Physical_Layer_Spec.pdf" scope="external">SD Association</xref> specification. </p> </section> |
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<section id="GUID-0EA05AC0-557D-573F-B907-41752445DC60"><title>SD controller |
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classes</title> <fig id="GUID-F044A820-5E7E-5A99-83D5-7CA47EBABBC8"> |
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<title> SD controller classes </title> |
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<image href="GUID-58A5C008-88B6-5C91-8BE5-E98CA5E5A438_d0e406001_href.png" placement="inline"/> |
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</fig> </section> |
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<section id="GUID-25A29720-A91E-49FA-8E60-3060F25536EA"><title>SD Stack </title><p>The SD controller is implemented through |
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a set of classes derived from the MMC controller. The <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DMMCStack</apiname></xref> maintains |
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a state machine and is responsible for detecting the new cards and initializing |
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the necessary stack. The <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DSDStack</apiname></xref> is |
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initialised when the controller detects a new SD card. The <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DSDStack</apiname></xref> sends |
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the commands to acquire the cards as described in the SD topology. <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DSDStack::InitialiseMemoryCardSM()</apiname></xref> is used to |
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initialize the SD cards and <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DSDStack::ConfigureMemoryCardSM()</apiname></xref> is |
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used to configure the card. </p></section> |
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<section id="GUID-23D87A40-614C-4F4D-A35E-B02216097C1A"><title>TSDCard</title><p>The <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>TSDCard</apiname></xref> class |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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provides the functions to read and write information about the card. The <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>PreferredWriteGroupLength</apiname></xref> returns the Erase Sector |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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5
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size of the SD card. Clients of the SD controller should use <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DMMCStack::CardP()</apiname></xref> to |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
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80 |
get a pointer to the card object.<xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname> TSDCard::IsCard()</apiname></xref> function |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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81 |
is used to detect a SD card. </p></section> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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82 |
<section id="GUID-9D9AE44F-1E6F-4D09-9B3E-76AB3BFC42F2"><title>Omissions</title> <p>The |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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83 |
Symbian platform does not support SPI mode in SD cards. </p> </section> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
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84 |
<section id="GUID-8B7FCAA7-3A62-4CEA-917E-27CC571E6FAF"><title>Session</title><p>The <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DSDSession</apiname></xref> class |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
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85 |
provides the session related functions for the SD cards. The <xref href="GUID-3DC34D4F-E693-3BF0-B5D6-DF22FCE37340.dita"><apiname>DSDSession</apiname></xref> class |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
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86 |
creates the descriptors with command data. These commands are then sent to |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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87 |
the SD cards by the controller. </p></section> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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88 |
</conbody><related-links> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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89 |
<link href="GUID-0E5A241A-19F5-5754-B454-45747A8D80E1.dita"><linktext>SD Card Overview</linktext> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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90 |
</link> |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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91 |
<link href="GUID-E194A923-99E7-5DC1-BB78-D050A4793A60.dita"><linktext>SD Controller |
59758314f811
Week 23 contribution of PDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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92 |
PSL Implementation</linktext></link> |
1
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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</related-links></concept> |