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Embedded Systems terms
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- 1real-time constraintsits an applications, where particular
computation must be completed by a certain time or the system fails - 2signalsEmbedded systems applications typically involve processing information as
signals. The lay term “signal” often connotes radio transmission - 3Digital signal processorsare processors specially tailored for signal-processing applications
- 4“core plus ASIC” or “system on a chip” (SOC)is the use of processor cores
together with application-specific circuitry. may also be viewed as special-purpose multiprocessors - 5embedded problems are usually solved by one of three approaches:1. The designer uses a combined hardware/software solution that includes some
custom hardware and an embedded processor core that is integrated with the
custom hardware, often on the same chip.
2. The designer uses custom software running on an off-the-shelf embedded
processor.
3. The designer uses a digital signal processor and custom software for the processor. Digital signal processors are processors specially tailored for signal-processing applications. - 6real-time performance requirementis one where a segment of the
application has an absolute maximum execution time that is allowed. - 7hard real-time systemsA real-time system is an system intended to serve real-time applications that process data as it comes in, typically without buffer delays.
- 8soft real-timethe system where The average time for a particular task is constrained as
well as is the number of instances when some maximum time is exceeded. - 9worst-case execution time (WCET).its a Technic analyze code assumes that all branches are mispredicted and all caches miss,the WCET is overly pessimistic.
- 10line lockingIn this approach, a cache line can be locked in the cache so that it cannot be replaced until the line is
unlocked - 11digital signal processor (DSP)is a special-purpose processor optimized for
executing digital signal processing algorithms. - 12multiply-accumulate (MAC)DSPs feature special-purpose hardware to
perform multiply-accumulate:
“A = A + B * C.” - 13forward error correction (FEC)DSPs class of algorithms revolve around encoding and decoding codes in
which extra information is added to the digital bit stream to guard against errors
in transmission. - 14media extensionsThere is a middle ground between DSPs and microcontrollers: media extensions. These extensions add DSP-like capabilities to microcontroller architectures at
relatively low cost.
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- Fichas sobre Embedded Systems terms, creado por джордж гаврилович el 25/03/2020.
- Creado por
- джордж гаврилович · mar 2020
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- 25 mar 2020
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