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22 nd October 2008. Embedded System Design. By Santosh N.Gudge. Definition. Embedded System : Any Device that includes a computer but is not itself a general-purpose computer.

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Presentation Transcript
definition
Definition
  • Embedded System: Any Device that includes a computer but is not itself a general-purpose computer.
  • Hardware and software- part of some larger systems and expected to function without human intervention.
  • Respond, Monitor, control external environment using sensors and Actuators.
examples
Examples
  • Personal Digital assistant(PDA).
  • Printer.
  • Cell Phone.
  • Automobile: Engine, brakes, Dash, etc.
  • Television.
  • Household appliances.
  • Surveillance System.
automotive embedded systems
Automotive embedded Systems
  • Today’s high-end automobile may have 100 microprocessors.
  • 4-bit Microcontrollers run dashboard devices.
  • 16/32-bit microprocessor controls engine.
characteristics of embedded systems
Characteristics of embedded Systems
  • Sophisticated functionality.
  • Low manufacturing cost.
  • Application dependent processor ( ?)
  • Restricted Memory
  • Low power .

**Power consumption is critical in battery-powered devices.

types of embedded system
Types of Embedded System
  • Similar to General Computing

*PDA, Set-top boxes, video games etc

  • Control Systems

*flight control, Nuclear reactors

  • Signal processing

*Radar, Sonar, DVD players

  • Communication and Networking

*Cellular phones, Internet appliances.

challenges in embedded system design
Challenges in embedded System design
  • How much hardware do you need?

* what is word size of the CPU? Size of memory?

  • How do we meet our deadlines?

*Faster hardware or Cleverer Software?

  • How do we minimize power?

*Turn off unnecessary logic ? Reduce Memory accesses?

design goals
Design goals
  • Performance

*overall speed, deadlines.

  • Functionality and user interface.
  • Manufacturing cost.
  • Power consumption.
  • Other requirements(physical size, etc.)
functional vs non functional requirements
Functional vs. non-functional requirements
  • Functional requirements:

*output as a function of input.

  • Non-functional requirements:

>time required to compute output;

>size, weight , etc;

>power consumption;

>reliability;

Etc.

top down vs bottom up
Top-down vs bottom-up
  • Top-down design

>start from most abstract description;

>work to most detailed.

  • Bottom-up design:

>work from small components to big system.

concluding remarks
Concluding Remarks
  • Embedded computers are all around us.

>Many systems have complex embedded hardware and software.

  • Embedded systems pose many design challenges : design time, deadlines, power, etc.
  • Design methodologies help us manage the design process.
references
References
  • http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=4141246&isnumber=4141231
  • http://www.ece.cmu.edu/~koopman/iccd96/iccd96.html
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