Embedded System

1. Embedded System 電機四 林昱呈 Yu-Cheng Lin

2. Outline • Introduction • Architecture • Characteristics • Design issues • Application view • Conclusion Yu-Cheng Lin

3. Definition • An embedded system is a special-purpose computer system built into a larger device. An embedded system is required to meet very different requirements than a general-purpose personal computer. • From Wikipedia Yu-Cheng Lin

4. Overview • Computing systems embedded within electronic devices • Hard to define. Nearly any computing system other than a desktop computer • Embedded system everywhere Yu-Cheng Lin

5. Outline • Introduction • Architecture • Characteristics • Design issues • Application view • Conclusion Yu-Cheng Lin

6. Hardware Architecture (1/2) Yu-Cheng Lin

7. Hardware Architecture (2/2) • Input interface • Signal processor • Central processor • Output interface Yu-Cheng Lin

8. Digital camera chip CCD CCD preprocessor Pixel coprocessor D2A A2D lens JPEG codec Microcontroller Multiplier/Accum DMA controller Display ctrl Memory controller ISA bus interface UART LCD ctrl Example Central processor Input interface Digital signal processor Output display Yu-Cheng Lin

9. PDA’s Software Architecture Yu-Cheng Lin

10. Outline • Introduction • Architecture • Characteristics • Design issues • Application view • Conclusion Yu-Cheng Lin

11. CPU & Programming Tools • Many different CPU architectures used in embedded designs • Intel/AMD x86 • Apple/Motorola/IBM PowerPC • Programming tools • Compilers • Assemblers • Debuggers OpenBlockS266 Yu-Cheng Lin

12. Various OS System • Palm OS • Ex: Palm, Sony PDA • Windows CE • Ex: Compaq, Leo, Casio PDA • EPOC • Ex: Psion Series • RTxc • Sharp’s Synergy, 中環的 CyberBoy Yu-Cheng Lin

13. Characteristics (1/3) • Single-functioned • Executes a single program, repeatedly • Ex: 悠遊卡讀卡機 • Tightly-constrained • Low cost • Low power • Small • Ex: mp3 player Yu-Cheng Lin

14. Characteristics (2/3) • Low cost • Tens of thousands to millions of units • Using a (relatively) suitable processor and small memory size • Low power • Ex: 計算機 • Slow speed • Fulfilling the requirement is OK Yu-Cheng Lin

15. Characteristics (3/3) • Reactive and real-time • Continually reacts to changes in the system’s environment • Must compute certain results in real-time without delay • Ex: 微波爐 • Firmware • Software embedded in hardware devices Yu-Cheng Lin

16. Outline • Introduction • Architecture • Characteristics • Design issues • Application view • Conclusion Yu-Cheng Lin

17. Product Life-cycle Yu-Cheng Lin

18. Design Issues (1/2) • Real time/reactive operation • Worst case design analyses without undue pessimism • Small size, low weight • Non-rectangular, non-planar geometries • Packaging and integration of digital, analog, and power circuits to reduce size Yu-Cheng Lin

19. Design Issues (2/2) • Safe and reliable • Low-cost reliability with minimal redundancy • Harsh environment • Design components depending on operating environment • Cost-sensitive • Variable "design margin" to permit tradeoff between product robustness and aggressive cost optimization Yu-Cheng Lin

20. Outline • Introduction • Architecture • Characteristics • Design issues • Application view • Conclusion Yu-Cheng Lin

21. 六度思維空間 • 資訊 • 通訊 • 多媒體 • 服務 • 娛樂 • 感知 更高階的產品??? Yu-Cheng Lin

22. 高階的嵌入式系統 Yu-Cheng Lin

23. 資訊家電與行動裝置的發展情況 • 從以電腦為中心的設計轉向以消費者為中心的設計 • 多產業標準並存的網路架構以及互動性 • 頻寬保證等先進網路特性 ???? Yu-Cheng Lin

24. Outline • Introduction • Architecture • Characteristics • Design issues • Application view • Conclusion Yu-Cheng Lin

25. Conclusion • 科技始於人性 • 一機在手，無限可能 • 更輕，更薄，更快，更便宜，更好用 Yu-Cheng Lin

26. Reference • ICCD ’96 Embedded Tutorial: Embedded System Design Issues • http://www.ece.cmu.edu/~koopman/iccd96/iccd96.html • Web site: • http://www.cs.ucr.edu/content/esd/slide_index.html • http://en.wikipedia.org/wiki/Embedded_system • http://playstation2.idv.tw/iacolumns/jl000013.html Yu-Cheng Lin