Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Energy-Efficient Flash Memory Management in Embedded Systems
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In today’s embedded systems there is a growing need for energy efficient solutions as applications and hardware are growing in power consumption levels. That is why GEODES was initiated, a project where several companies and universities hold as main objective to develop power efficient solutions in embedded software. This master thesis is realized at ENEA and is part of GEODES. The focus of the work is flash memory management and how this type of software can be made power efficient. The first part of the master thesis is a theoretical study in flash memory management and power efficiency in flash systems. This study identified and evaluated the current solutions that exist in this topic. The theoretical foundation was made so an implementation of an energy efficient flash management system could be realized. A requirement specification was also developed regarding both basic functionality and energy optimization. After the theoretical study a power efficient design was developed, containing techniques like data separation, intelligent garbage collection and the utilization of a cache memory. More basic functionality like error code correction, bad block management and wear levelling was also included. The implementation was based on this design and the result was a driver layer for a flash memory, however no power management techniques were included due to time restrictions. The driver was implemented on an i.MX31 board in an OSE5.4 environment; this module (memory device driver - MDD) controlled a 128 M x 8-bit NAND flash memory and included functionalities such as error code correction, bad block management and status read. The MDD utilized an internal RAM buffer and the i.MX31 boards NAND flash controller. It executed all the operations (read, write and erase) and used the spare area for metadata writes.

Abstract [sv]

I dagens inbyggda system ser vi behovet av energieffektiva lösningar växa då applikationers och hårdvarors strömkonsumtionsnivåer ökar. Därför har GEODES, ett samarbetsprojekt mellan flera företag och universitet, initierats. GEODES mål är att utveckla strömsparande lösningar inom inbyggda system och deras arbete sträcker sig över hela Europa. Detta examensarbete utfördes på ENEA och var del av GEODES projektet, fokus på arbetet var flashminnes-hantering och hur man skulle kunna strömeffektivisera sådana typer av system. Första delen av arbetet är en teoretisk fördjupning i flashminnes-hantering och energieffektivisering. I denna studie identifierades och utvärderades de lösningar som finns idag. Grunden och teoretiska underlaget lades för att kunna implementera ett sådant system. En mall för ett strömsnålt flash-lager togs fram i form av en kravspecifikation, dessa krav berörde både grundläggande funktionalitet och strömsparning. Nästa steg var utvecklingen av en energieffektiv design som innehöll teknikerna dataseparering, intelligent skräphantering och cache minne. Denna design tillhandhöll också funktionaliteter som error code correction, bad block management och wear-levelling. Implementationen baserades på denna design och resultatet blev en drivare för ett flashminne, men på grund utav tidsrestriktioner så hann inga strömsparnings-tekniker realiseras. Drivaren implementerades på ett i.MX31-kort i OSE5.4 miljö; denna modul (Memory Device Driver - MDD) styrde ett 128 M x 8-bit NAND flashminne och tillhandahöll funktionaliteter som error code correction, bad block management och statusläsning. MDD:n utnyttjade en intern RAM-buffert, i.MX31-kortets NAND flash controller, samt utförde alla operationer (läsa, skriva och radera) och brukade minnets ”spare area” för metadata skrivningar.

Place, publisher, year, edition, pages
2014. , 57 p.
Series
MMK 2010:69 MDA 386
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-176276OAI: oai:DiVA.org:kth-176276DiVA: diva2:866323
External cooperation
ENEA
Supervisors
Examiners
Available from: 2015-11-03 Created: 2015-11-02 Last updated: 2015-11-03Bibliographically approved

Open Access in DiVA

fulltext(1086 kB)78 downloads
File information
File name FULLTEXT01.pdfFile size 1086 kBChecksum SHA-512
db73aa1b09ae22a7238c51ffd29a8aaad0e5f75153df9e7aec07a72053416b37fcaf8bfe0f6515c977d44e25a53396084bd7827bc589d07e2c9f4c19b4a41429
Type fulltextMimetype application/pdf

By organisation
Machine Design (Dept.)
Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 78 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 238 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf