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1 <?xml version="1.0" encoding="utf-8"?> |
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2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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3 <!-- This component and the accompanying materials are made available under the terms of the License |
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4 "Eclipse Public License v1.0" which accompanies this distribution, |
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5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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6 <!-- Initial Contributors: |
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7 Nokia Corporation - initial contribution. |
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8 Contributors: |
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9 --> |
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10 <!DOCTYPE concept |
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11 PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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12 <concept id="GUID-4AFDA3FF-38D1-5EFE-B18A-E3EAAA52EB75" xml:lang="en"><title>Flash |
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13 Guide</title><shortdesc> Flash memory is a class of memory that can retain its contents |
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14 even after the power has been switched off.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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15 <section id="GUID-71F0C83A-D03C-5CF7-9395-C7BD746B25A8"><title>Introduction</title> <p>Unlike |
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16 ROM, the data in Flash memory can be changed by an application. </p> </section> |
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17 <section id="GUID-97937125-353C-4043-B430-0327E214C87B"><title>Flash memory features</title> <p> Features of Flash memory |
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18 are:</p><ul> |
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19 <li><p> Writing and erasing of memory has to be undertaken in blocks of memory</p></li> |
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20 <li><p> Memory contents are retained until erased (regardless of whether the |
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21 power has been turned on/off). </p></li> |
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22 </ul></section> |
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23 <section id="GUID-70642797-8164-462D-9542-05E8CB343629"><title>Flash memory limitations</title> <p>The following are limitations |
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24 of FLASH memory: </p><ul> |
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25 <li><p>There are a finite number of erase-write cycles (usually 100,000).</p></li> |
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26 <li><p>NAND Flash cannot be executed in place. Instead the contents have to |
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27 be loaded into RAM and then executed. </p></li> |
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28 </ul></section> |
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29 </conbody></concept> |