[PDF] Ultra Reliable Flash Memory Systems For Embedded Applications eBook

Author : Thomas McCormick
Publisher :
Page : 234 pages
File Size : 29,16 MB
Release : 2016
Category : Data transmission systems
ISBN :

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Based on its ruggedness, solid-state flash memory has been accepted as the basis of code and data storage in embedded systems applications for several decades. In more recent years, widespread mainstream acceptance of flash memory in consumer and enterprise applications has created tremendous downward cost pressures on flash memory manufacturers. The flash memory manufacturers have responded to these pressures by compromising on parameters that are most critical for flash memory's continued suitability for code storage in embedded computer applications. In particular, data retention specifications have been decreased from ten years to as low as one year. This is unacceptable for embedded systems applications that depend on flash memory systems to provide reliable code storage for many years of service. Enabling flash memory systems to continue to reliably support code storage in embedded computer applications requires that wear induced by write requests be minimized. One means of reducing write requests is to reduce the impact of the overhead writes performed by the flash translation layer (FTL) that is used to manage the flash memory while presenting the overall flash memory system as a non-volatile rewritable block device. These overhead write activities may be represented with a measure of Write Amplification Factor (WAF) which is the amount of flash write requests scaled by the amount of write requests performed by the system hosting the flash memory system. In this dissertation, we present FSAware, a novel algorithmic approach that enhances existing FTL designs. Specifically, FSAware reduces overall WAF by separately supporting the write requests associated with the file data and file system overhead produced by host file system write activities. FSAware distinguishes file data write requests from file system overhead write requests by characterizing the file system installed on the flash memory system by the host system. We consider the File Allocation Table (FAT) format, which is specifically selected for its ubiquity in embedded computer applications. FSAware is applicable to both block-mode and page-mode style FTLs. In this work, we develop a novel instrumentation technique called FTLProbe to develop empirical (gray box) models of commercially available drives. Our empirical models are then used to develop WAF equations for file system operations. Simulations of FSAware on commercially available drives are validated with extensions of these WAF equations. Our simulations results show that FSAware can produce a 97% reduction of WAF for a block-mode FTL and a 36% reduction of WAF for a page-mode FTL. Further extension of the WAF equations show that an enhanced FSAware that consolidates meta-data into a single flash allocation unit can theoretically produce a 99% reduction of WAF for a block-mode FTL and a 64% reduction of WAF for a page-mode FTL. With these reductions in overall WAF for file system operations associated with embedded systems, FSAware can form the basis of an ultra-reliable flash memory system for embedded computer applications.

Author : Joe Brewer
Publisher : John Wiley & Sons
Page : 766 pages
File Size : 39,48 MB
Release : 2011-09-23
Category : Technology & Engineering
ISBN : 1118211626

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Presented here is an all-inclusive treatment of Flash technology, including Flash memory chips, Flash embedded in logic, binary cell Flash, and multilevel cell Flash. The book begins with a tutorial of elementary concepts to orient readers who are less familiar with the subject. Next, it covers all aspects and variations of Flash technology at a mature engineering level: basic device structures, principles of operation, related process technologies, circuit design, overall design tradeoffs, device testing, reliability, and applications.

Author : Kevin Zhang
Publisher : Springer Science & Business Media
Page : 390 pages
File Size : 19,19 MB
Release : 2009-04-21
Category : Technology & Engineering
ISBN : 0387884971

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Kevin Zhang Advancement of semiconductor technology has driven the rapid growth of very large scale integrated (VLSI) systems for increasingly broad applications, incl- ing high-end and mobile computing, consumer electronics such as 3D gaming, multi-function or smart phone, and various set-top players and ubiquitous sensor and medical devices. To meet the increasing demand for higher performance and lower power consumption in many different system applications, it is often required to have a large amount of on-die or embedded memory to support the need of data bandwidth in a system. The varieties of embedded memory in a given system have alsobecome increasingly more complex, ranging fromstatictodynamic and volatile to nonvolatile. Among embedded memories, six-transistor (6T)-based static random access memory (SRAM) continues to play a pivotal role in nearly all VLSI systems due to its superior speed and full compatibility with logic process technology. But as the technology scaling continues, SRAM design is facing severe challenge in mainta- ing suf?cient cell stability margin under relentless area scaling. Meanwhile, rapid expansion in mobile application, including new emerging application in sensor and medical devices, requires far more aggressive voltage scaling to meet very str- gent power constraint. Many innovative circuit topologies and techniques have been extensively explored in recent years to address these challenges.

Author : Jim Ledin
Publisher : Packt Publishing Ltd
Page : 376 pages
File Size : 17,46 MB
Release : 2021-02-05
Category : Computers
ISBN : 178995939X

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Explore the complete process of developing systems based on field-programmable gate arrays (FPGAs), including the design of electronic circuits and the construction and debugging of prototype embedded devices Key FeaturesLearn the basics of embedded systems and real-time operating systemsUnderstand how FPGAs implement processing algorithms in hardwareDesign, construct, and debug custom digital systems from scratch using KiCadBook Description Modern digital devices used in homes, cars, and wearables contain highly sophisticated computing capabilities composed of embedded systems that generate, receive, and process digital data streams at rates up to multiple gigabits per second. This book will show you how to use Field Programmable Gate Arrays (FPGAs) and high-speed digital circuit design to create your own cutting-edge digital systems. Architecting High-Performance Embedded Systems takes you through the fundamental concepts of embedded systems, including real-time operation and the Internet of Things (IoT), and the architecture and capabilities of the latest generation of FPGAs. Using powerful free tools for FPGA design and electronic circuit design, you'll learn how to design, build, test, and debug high-performance FPGA-based IoT devices. The book will also help you get up to speed with embedded system design, circuit design, hardware construction, firmware development, and debugging to produce a high-performance embedded device – a network-based digital oscilloscope. You'll explore techniques such as designing four-layer printed circuit boards with high-speed differential signal pairs and assembling the board using surface-mount components. By the end of the book, you'll have a solid understanding of the concepts underlying embedded systems and FPGAs and will be able to design and construct your own sophisticated digital devices. What you will learnUnderstand the fundamentals of real-time embedded systems and sensorsDiscover the capabilities of FPGAs and how to use FPGA development toolsLearn the principles of digital circuit design and PCB layout with KiCadConstruct high-speed circuit board prototypes at low costDesign and develop high-performance algorithms for FPGAsDevelop robust, reliable, and efficient firmware in CThoroughly test and debug embedded device hardware and firmwareWho this book is for This book is for software developers, IoT engineers, and anyone who wants to understand the process of developing high-performance embedded systems. You'll also find this book useful if you want to learn about the fundamentals of FPGA development and all aspects of firmware development in C and C++. Familiarity with the C language, digital circuits, and electronic soldering is necessary to get started.

Author :
Publisher :
Page : 189 pages
File Size : 26,65 MB
Release : 2015
Category : Electronic books
ISBN :

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NAND flash memory (hereafter, flash memory) has been intensively employed in a wide spectrum of computing systems from mobile devices like smartphones to personal computers to enterprise servers due to its high performance, low power consumption, and shock resistance. However, the further deployment of flash memory is impeded because it also possesses several inherent disadvantages such as limited programming/erase cycles and asymmetrical I/O performance. Besides, the existing frameworks for storage systems are originally designed for block devices (e.g., hard disk drives), which have totally different characteristics from flash memory. In order to utilize flash memory in current storage systems, an extra software layer between a traditional storage system interface and flash memory is needed to mimic the behavior of a block device. Unfortunately, using a flash-based storage system as a traditional HDD noticeably neutralizes the benefits of flash memory.In this dissertation, we holistically examine current flash-based storage systems in different computing platforms ranging from embedded systems to enterprise servers. Firstly, we empirically characterize a representative collection of flash memory devices and then model their raw I/O performance and reliability. Our results demonstrate that flash memory performance and reliability are correlated to programmed data patterns. Further, we propose multiple approaches to improving the performance and reliability of flash-based storage systems at device level. Secondly, we study flash translation layer (FTL) in flash-based solid-state drives (SSDs) for desktops. A plane-centric FTL and a workload-aware MLC/SLC (multi-level cell/single-level cell) partitioning scheme are implemented to boost the performance of a single SSD. Thirdly, the employment of SSD arrays in enterprise servers is investigated. We propose a load-balancing scheme at disk array level to prolong the lifetime of SSD arrays for server applications like OLTP (online transaction processing). Finally, an MTD (memory technology device) array based storage framework will be developed to meet the performance and reliability requirements demanded by emerging and future data-intensive and mission-critical mobile applications.

Author : Khalgui, Mohamed
Publisher : IGI Global
Page : 558 pages
File Size : 21,95 MB
Release : 2013-04-30
Category : Computers
ISBN : 1466639237

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Embedded computing systems play an important and complex role in the functionality of electronic devices. With our daily routines becoming more reliant on electronics for personal and professional use, the understanding of these computing systems is crucial. Embedded Computing Systems: Applications, Optimization, and Advanced Design brings together theoretical and technical concepts of intelligent embedded control systems and their use in hardware and software architectures. By highlighting formal modeling, execution models, and optimal implementations, this reference source is essential for experts, researchers, and technical supporters in the industry and academia.

Author : Jing Chen
Publisher : Springer Science & Business Media
Page : 634 pages
File Size : 22,11 MB
Release : 2004-05-21
Category : Computers
ISBN : 3540219749

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This book constitutes the thoroughly refereed post-proceedings of the 9th International Conference on Real-Time and Embedded Systems and Applications, RTCSA 2003, held in Tainan, Taiwan, in February 2003. The 28 revised full papers and 9 revised short papers presented were carefully reviewed and selected for inclusion in the book. The papers are organized in topical sections on scheduling, networking and communication, embedded systems and environments, pervasive and ubiquitous computing, systems and architectures, resource management, file systems and databases, performance analysis, and tools and development.

Author : Maurizio Di Paolo Emilio
Publisher : Springer
Page : 170 pages
File Size : 19,89 MB
Release : 2014-09-01
Category : Technology & Engineering
ISBN : 3319068652

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This book serves as a practical guide for practicing engineers who need to design embedded systems for high-speed data acquisition and control systems. A minimum amount of theory is presented, along with a review of analog and digital electronics, followed by detailed explanations of essential topics in hardware design and software development. The discussion of hardware focuses on microcontroller design (ARM microcontrollers and FPGAs), techniques of embedded design, high speed data acquisition (DAQ) and control systems. Coverage of software development includes main programming techniques, culminating in the study of real-time operating systems. All concepts are introduced in a manner to be highly-accessible to practicing engineers and lead to the practical implementation of an embedded board that can be used in various industrial fields as a control system and high speed data acquisition system.

Author : Hideto Hidaka
Publisher : Springer
Page : 253 pages
File Size : 43,90 MB
Release : 2017-09-09
Category : Technology & Engineering
ISBN : 3319553062

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This book provides a comprehensive introduction to embedded flash memory, describing the history, current status, and future projections for technology, circuits, and systems applications. The authors describe current main-stream embedded flash technologies from floating-gate 1Tr, floating-gate with split-gate (1.5Tr), and 1Tr/1.5Tr SONOS flash technologies and their successful creation of various applications. Comparisons of these embedded flash technologies and future projections are also provided. The authors demonstrate a variety of embedded applications for auto-motive, smart-IC cards, and low-power, representing the leading-edge technology developments for eFlash. The discussion also includes insights into future prospects of application-driven non-volatile memory technology in the era of smart advanced automotive system, such as ADAS (Advanced Driver Assistance System) and IoE (Internet of Everything). Trials on technology convergence and future prospects of embedded non-volatile memory in the new memory hierarchy are also described. Introduces the history of embedded flash memory technology for micro-controller products and how embedded flash innovations developed; Includes comprehensive and detailed descriptions of current main-stream embedded flash memory technologies, sub-system designs and applications; Explains why embedded flash memory requirements are different from those of stand-alone flash memory and how to achieve specific goals with technology development and circuit designs; Describes a mature and stable floating-gate 1Tr cell technology imported from stand-alone flash memory products - that then introduces embedded-specific split-gate memory cell technologies based on floating-gate storage structure and charge-trapping SONOS technology and their eFlash sub-system designs; Describes automotive and smart-IC card applications requirements and achievements in advanced eFlash beyond 4 0nm node.

Author : Jalil Boukhobza
Publisher : Elsevier
Page : 268 pages
File Size : 18,85 MB
Release : 2017-03-10
Category : Technology & Engineering
ISBN : 008101158X

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4 zettabytes (4 billion terabytes) of data generated in 2013, 44 zettabytes predicted for 2020 and 185 zettabytes for 2025. These figures are staggering and perfectly illustrate this new era of data deluge. Data has become a major economic and social challenge. The speed of processing of these data is the weakest link in a computer system: the storage system. It is therefore crucial to optimize this operation. During the last decade, storage systems have experienced a major revolution: the advent of flash memory. Flash Memory Integration: Performance and Energy Issues contributes to a better understanding of these revolutions. The authors offer us an insight into the integration of flash memory in computer systems, their behavior in performance and in power consumption compared to traditional storage systems. The book also presents, in their entirety, various methods for measuring the performance and energy consumption of storage systems for embedded as well as desktop/server computer systems. We are invited on a journey to the memories of the future. Ideal for computer scientists, featuring low level details to concentrate on system issues Tackles flash memory aspects while spanning domains such as embedded systems and HPC Contains an exhaustive set of experimental results conducted in the Lab-STICC laboratory Provides details on methodologies to perform performance and energy measurements on flash storage systems