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Embedded Computing Systems Question paper
Post: #1

Embedded Computing Systems Question paper


.pdf  Embedded Computing Systems.pdf (Size: 1.22 MB / Downloads: 76)

PART — A

1 ) a. Compare the definitions of embedded system from the following authors
i) Wayne Wolf
ii) Todd.D. Mortan.

b. What are the major differences between Harvard and Von Neuman architecture? Give an example.

c. What are the functional circuits in a microcontroller chip? Explain them in detail.

2 a. What is charge pump? Explain the following terms related to embedded hardware units :
i) Clock oscillator circuit
ii) System timer
iii) Power — up reset and watch — dog t., timer

b. Comprehend the procedure to code high level and assembly software into mlc implementable software, for an embedded system. Highlight their differences.

3 a. Compare the parallel ports interfaces for the keypad, stepper motor and touch screen.

b. Describe and compare UART and HDLC protocol.

4 a. Show the procedure of diversion to higher priority interrupts.
b. What is DMAC? Explain the steps of DMA to facilitate a multi byte data transfer.
c. What is virtual device driver? Explain any two of them in detail.
Post: #2

An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with constraints of real-time computing. It is embedded as part of a complete device that often includes hardware and mechanical parts. Integrated systems control many devices in common use today. Ninety-eight percent of all microprocessors are manufactured as components of embedded systems.

Examples of properties of typical embedded equipment compared to general purpose are low power consumption, small size, rugged operating ranges and low cost per unit. This occurs at the expense of limited processing resources, which makes them much more difficult to program and interact with. However, by building intelligence mechanisms at the top of the hardware, taking advantage of possible existing sensors and the existence of a network of embedded units, the resources available at the unit and network level can be optimally managed. For example, intelligent techniques can be designed to manage the energy consumption of embedded systems.

Modern embedded systems are often based on microcontrollers (ie CPUs with built-in memory or peripheral interfaces), but ordinary microprocessors (which use external chips for memory and peripheral interface circuits) are also common, especially in poorer systems complex. In any case, the processor (s) used can be types ranging from the general purpose to those specialized in some kind of calculations, or even tailor-made for the application in question. A common standard class of dedicated processors is the digital signal processor (DSP).

Because the integrated system is dedicated to specific tasks, design engineers can optimize it to reduce the size and cost of the product and increase reliability and performance. Some embedded systems are mass-produced, benefiting from economies of scale.

Integrated systems range from portable devices such as digital clocks and MP3 players to large stationary facilities such as traffic lights, factory controllers and largely complex systems such as hybrid vehicles, magnetic resonance imaging and avionics. The complexity varies from low, with a single microcontroller chip, to very high with multiple units, peripherals and networks mounted inside a large chassis or enclosure.
 

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