tailieunhanh - Thiết kế hệ thống nhúng

Tài liệu tham khảo cho các bạn học chuyên ngành điện tử có tư liệu ôn thi tốt đạt kết quả cao trong các kì thi giữa kì và cuối kì | Embedded System – p /27 Embedded System ThS. Le Hoai Nghia nghialh@ February 2009 UNIVERSITY OF INFORMATION TECHNOLOGY Spot the Computer Embedded System – p /27 Hidden Computers Casio Nokia 7110 Sony Camera Browser Playstation 2 Watch Phone Philips Philips DVD Player TiVo Recorder Embedded System – p /27 Concurrency Legacy Languages Technical Challenges Real-time Complexity Embedded System – p /27 S oftware complexity growing Size of Typical Embedded System 1985 13kLOC 1989 21 kLOC 44 % per year 1998 1 MLOC 2000 2MLOC 2008 16 MLOC Windows NT 2010 32MLOC Windows 2000 Source: “ESP: A 10-Year Retrospective,” Embedded Systems Programming, November 1998 Embedded System – p /27 Digital Camera Block Diagram Embedded System – p /27 The Design Challenge Design optimal device that meets constraints on Price Functionality Performance Size Power Time-to-market Maintainability Safety Embedded System – p /27 The Time to Market Challenge Market Window Typical time-to-market constraint: 8 months Time Embedded System – p /27 Simplified Revenue Model Loss due to delay Market ramp On-time curve Delayed curve Time Sales D W 2W Assuming a constant market ramp, on-time revenue is 2 1bh = 1 2 •2W• W = W2 and delayed revenue is1 2 (2W - D)(W - D) so fractional revenue loss is D(3W - D) = O(D2) 2W2 Example: when W = 26 and D = 10, fraction lost is about 50%. Embedded System – p /27 NRE Nonrecurring engineering cost: The cost of producing the first one. NRE cost dominates Production cost dominates log Volume Low NRE, high production costs High NRE, low production costs Embedded System – p /27 Embedded System Technologies Integrated Circuits Processing elements Design tools Embedded System – p /27 IC Technology 1947: First transistor (Shockley, Bell Labs) 1958: First integrated circuit (Kilby, TI) 1971: First microprocessor (4004: Intel) Today: six wire layers, 45 nm features Embedded System – p /27 Moore’s Law Gordon Moore, 1965: | Embedded System – p /27 Embedded System ThS. Le Hoai Nghia nghialh@ February 2009 UNIVERSITY OF INFORMATION TECHNOLOGY Spot the Computer Embedded System – p /27 Hidden Computers Casio Nokia 7110 Sony Camera Browser Playstation 2 Watch Phone Philips Philips DVD Player TiVo Recorder Embedded System – p /27 Concurrency Legacy Languages Technical Challenges Real-time Complexity Embedded System – p /27 S oftware complexity growing Size of Typical Embedded System 1985 13kLOC 1989 21 kLOC 44 % per year 1998 1 MLOC 2000 2MLOC 2008 16 MLOC Windows NT 2010 32MLOC Windows 2000 Source: “ESP: A 10-Year Retrospective,” Embedded Systems Programming, November 1998 Embedded System – p /27 Digital Camera Block Diagram Embedded System – p /27 The Design Challenge Design optimal device that meets constraints on Price Functionality Performance Size Power Time-to-market Maintainability Safety Embedded System – p /27 The Time to Market Challenge Market Window .