embedded system - nanjing university€¦ · apollo guidance computer first modern embedded systems...
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Embedded System Embedded System ——A brief introduction
Presented by Li Chang & Jiang Lintong
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Q:What is a embedded system?Q:What is a embedded system?
4:Microprocessor
6:RAM
7:Flash memory
13:Ethernet port
16:USB port
ASDL
A:Here is a visual example.
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DefinitionDefinition
WikiWiki: A computer system designed to do one or a few
dedicated and/or specific functions often with real-time computing constraints.
IEEEIEEE: Devices used to control, monitor, or assist the operation of equipment, machinery or plants.
embedded system is not a strictly definable term.
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Huge categoryHuge category
With the complexity varies from low to high,
embedded systems range from portable devices, to large stationary installations, even to the systems controlling nuclear power plants.
For example:
PSP traffic lights nuclear plants
Embedded system is ubiquitous.
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CharacteristicsCharacteristics
User interface: from no to complex, which obey its huge category.
graphical user interface
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Processors: Two broad sorts, microprocessors microprocessors and
microcontrollersmicrocontrollers, which have many peripherals on chip, reducing cost and size. Eg: 68k,MIPS,PowerPC……
`
Reliability :Embedded systems often reside in machines that are expected to run continuously for years without errors, and in some cases
recover by themselves if an error occurs.
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Do some specific task, rather than multiple tasks like general purpose computers.
�More professional and compact
Attention: Attention: Embedded systems are not always
standalone devices. Many embedded systems consist of small, computerized parts within a larger device that serves a more general purpose.
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HistoryHistory
� Apollo Guidance Computer
first modern embedded systems
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Apollo Guidance ComputerApollo Guidance Computer
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Apollo Guidance ComputerApollo Guidance Computer
� One of the first IC-based
computers
� Onboard computation
and control for guidance,
navigation
� Control of the Command
Module (CM)
� Control of the Lunar
Module (LM) spacecraftApollo Guidance Computer and DSKY
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HistoryHistory
� Apollo Guidance Computer
first modern embedded systems
� Autonetics D-17 guidance computer
mass-produced embedded system
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Autonetics DAutonetics D--17 guidance computer17 guidance computer
� built from transistor logic
� had a hard disk for main memory
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HistoryHistory
� Apollo Guidance Computer
first modern embedded systems
� Autonetics D-17 guidance computer
mass-produced embedded system
� lower price & rise in processing power and functionality
after the 1960s
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HistoryHistory
� Apollo Guidance Computer
first modern embedded systems
� Autonetics D-17 guidance computer
mass-produced embedded system
� lower price & rise in processing power and functionality
after the 1960s
� almost all electronics devices
By the mid-1980s
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Variety Application of Variety Application of
embedded systemsembedded systems
� A digital exchange (Nortel DMS-100) used by an operator to offer local and long distance services in France. Each switch typically serves 10,000-100,000+ subscribers depending on the geographic area
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Variety Application of Variety Application of
embedded systemsembedded systems
� Typical multi-hop wireless sensor network architecture
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Variety Application of Variety Application of
embedded systemsembedded systems
� ABS brakes on a BMW motorcycle
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Variety Application of Variety Application of
embedded systemsembedded systems
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Variety Application of Variety Application of
embedded systemsembedded systems
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Thank you!Thank you!