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Lecture 13 Introduction to Embedded Systems

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Market. Average household uses ~225 embedded processors; about 35 for automobile ... 94% share of world market. 6%: Pentium, PowerPC, etc. ... – PowerPoint PPT presentation

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Title: Lecture 13 Introduction to Embedded Systems


1
Lecture 13Introduction to Embedded Systems
  • Graduate Computer Architecture
  • Fall 2005
  • Shih-Hao Hung
  • Dept. of Computer Science and Information
    Engineering
  • National Taiwan University

2
Computing Systems
  • Desktop
  • PC, Workstations, Laptops
  • Servers
  • Tier-0 network appliance
  • Tier-1 webserver
  • Tier-2 application/database server
  • File servers, Storage-area-network
  • Embedded Systems
  • PDA
  • Cellphone
  • Routers
  • Microcontrollers

3
Embedded?
  • Computing system embedded within electronic
    devices.
  • Combination of computer hardware and software
    designed to performance a specific function.
  • Any computing system that is not a desktop
    computer nor a server.

4
Area of Applications
  • General purpose
  • PDA
  • Control systems
  • Electronics, Automotive
  • Signal processing
  • Media player, Camera
  • Communication
  • Cellphone, switch

5
Market
  • Average household uses 225 embedded processors
    about 35 for automobile
  • Estimated 5 billion embedded processors in use
  • 94 share of world market
  • 6 Pentium, PowerPC, etc.
  • Source World Semiconductor Trade Statistics
    Bluebook

6
Key IssuesUsers Point of View
  • Single function/application
  • Dedicated to specific type of tasks
  • Tight constraints
  • Size
  • Power
  • Cost
  • Time-to-market
  • Real-time
  • Respond to environment in real time
  • Safety/Reliability
  • Failure can result in critical damages

7
Key IssuesDevelopers Point of View
  • Concurrent development of HW and SW, i.e. HW/SW
    codesign
  • Wide selection of uPs.
  • Wide selection of OS, mostly real time (RTOS)
  • Few system resources
  • Specialized development tools
  • Debugging skills important
  • Robust HW/SW

8
Example
9
Elements
10
Trends
  • High level of integration
  • System-on-chip (SoC)
  • Multiprocessor System-on-Chip (MPSoC)
  • HW/SW co-design
  • Concurrent development
  • Optimization
  • Design flow
  • Design tools
  • Experiences

11
Microcontroller
  • Usually a simple uP plus peripheral support
    devices integrated in a single package

12
SoC
  • A uP plus peripheral support devices integrated
    in a single chip
  • E.g. Intel StrongARM
  • SoC vs uController?

13
SoC Design
  • Intellectual Property (IP)
  • Circuits or cores pre-deisgned/pre-verified for
    certain functions
  • Implications
  • Lower design cost
  • Fast time-to-market

14
Requirements
  • Functional
  • Functions
  • I/O
  • Non-functional
  • Performance
  • Cost
  • Power consumption
  • Size/weight

15
Architecture
  • How to implement the specifications
  • Components
  • System structure
  • Hardware/software partitioning
  • HW/SW work together to solve a problem
  • Partitioning decided by
  • Performance
  • Flexibility
  • Cost

16
Architecture Design
17
Designing An Embedded System
  • Understand the big picture
  • Understand the details
  • Design SW with
  • Real time constraints
  • Low power
  • Small code size
  • Domain-specific knowledge
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