Echtzeitsysteme at TU München

Flashcards and summaries for Echtzeitsysteme at the TU München

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Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

Which types of memory architectures are there?

Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

Name interfacings to sensors and actuators

Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

Name 2 types of RT Database updates

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why is cache useful

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points to remember

Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

whaat to do when cache is full

Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

What is the problem with coherence? How can it be solved?

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How is the time difference between two microticks called

Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

Name 3 purposes of time measurement in cyber physical systems

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Basic definition and functionalities of a OS

Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

classification of rt systems

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Subdivision of executiopn model

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Exemplary flashcards for Echtzeitsysteme at the TU München on StudySmarter:

Echtzeitsysteme

Which types of memory architectures are there?

– Memory map

– Stack

– Heap

Echtzeitsysteme

Name interfacings to sensors and actuators

– GPIO (digitalization of IO)

– ADC (sample/hold of input during conversion time, antialiasing necessary)

– PWM (deliver variable amounts of power to external devices. Duty cycle = proportion of high voltage to cycle time)

– DAC

Echtzeitsysteme

Name 2 types of RT Database updates

– Time triggered

– Event triggered

Echtzeitsysteme

why is cache useful

spatial locality

temporal locality

Echtzeitsysteme

points to remember

• Write-through: done synchronously both to cache and main memory (next level cache)
• Write-back: initially writing only to cache, write to main memory (next level cache) when data
is replaced by new content.
• Write-back is more complex (dirty bit logic)
• Write allocate, data to write is loaded into cache (often for WB, hoping to write there again)

write-no-allocate, data at write location is not loaded into cache (normally WT, since there is
no advantage in caching)

Echtzeitsysteme

whaat to do when cache is full

LRU Least Recently Used. Pick the slot that hasn’t been used in the
longest time.
LFU Least Frequently Used. Pick the slot that has been used the least
often.
FIFO First In First Out. Pick the slot that has been in the cache the
longest (which is NOT the same as LRU).

Echtzeitsysteme

What is the problem with coherence? How can it be solved?

If multiple processes have their own cached version of a value and one gets changed, changes dont reflect to the other cached value. Single-Writer-Multiple-Reader solves this. For this, it is required to propagate memory locations correctly.

Echtzeitsysteme

How is the time difference between two microticks called

A granule

Echtzeitsysteme

Name 3 purposes of time measurement in cyber physical systems

• physical states can be derived from sensor values and time,
e.g. speed from change in position over time

actions, such as measurements or actuator commands may be
time dependent
• the order of events might be of interest or may have to be
enforced (e.g. fault finding, action sequences)

Echtzeitsysteme

Basic definition and functionalities of a OS

• Extended Machine
– Simpler and easier to use than the underlying hardware
– Hides technical details
• Resource Manager
–Provide orderly and controlled allocation of processors, memory etc.
– Protection through separation of user mode and kernel mode
• Concepts: Processes, files, system calls

Echtzeitsysteme

classification of rt systems

According to the consequences of the exceeding of limits: hard vs. soft real-
time systems
According to the execution model: time-controlled (cyclic, periodic) vs. event-
based (aperiodic)

Echtzeitsysteme

Subdivision of executiopn model

time triggered,

event driven

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