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Embedded Systems / ES previous year question papers

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QUESTION :2

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2011.

Sixth Semester

Information Technology

IT 2354 — EMBEDDED SYSTEMS

(Common to Computer Science and Engineering)

(Regulation 2008)

Time : Three hours Maximum : 100 marks

Answer ALL questions.

PART A — (10 × 2 = 20 marks)

1. Find the timer ’s clock frequency and its period for 8051. Assuming that XTAL = 11.0592

MHz.

2. What are the challenges in embedded computing system design?

3. What are the stages in an ARM pipeline?

4. When would you prefer to use busy-wait I/O over interrupt-driven I/O?

5. Define thread.

6. What is scheduling policy? Mention the scheduling states of a process.

7. What is the function of locator?

8. Write short notes on in-circuit-emulator.

9. List the levels of CMM.

10. What are the requirements for embedded system design?

PART B — (5 × 16 = 80 marks)

11. (a) Explain the major levels of embedded system design process with an example. (16)

Or

(b) Explain the instruction sets and condition codes of ARM processor with an example for

each. (16)

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12. (a) Explain the following memory systems :

(i) Two-level cache (5)

(ii) Direct-mapped cache (5)

(iii) Set-associative cache. (6)

Or

(b) Draw a UML sequence diagram for copying characters from an input to an output

device using interrupt-driven I/O. The diagram should include the two devices and the two

I/O handlers. (16)

13. (a) For the periodic processes given below, find a valid schedule

(i) Using standard RMS, and

(ii) Adding one unit of overhead for each context switch. (16)

Process CPU time Dead lineP1 2 30

P2 4 40

P3 7 120

P4 5 60

P5 1 15

Or

(b) Explain the following :

(i) Blocking interprocess communication (5)

(ii) Nonblocking interprocess communication (5)

(iii) Shared memory communication. (6)

14. (a) Explain the multi-state systems and function sequences. (16)

Or

(b) Explain the following :

(i) ROM Emulators (8)

(ii) Remote Debuggers. (8)15. (a) (i) Explain the case study of Audio players. (8)

(ii) Explain the design example of software modem. (8)

Or

(b) Explain the advanced techniques for specification with an example. (16)

QUESTION :3

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011

Sixth Semester

Information Technology

IT 2354 — EMBEDDED SYSTEMS

(Common to Computer Science and Engineering)

(Regulation 2008)Time : Three hours Maximum : 100 marks

Answer ALL questions

PART A — (10 × 2 = 20 marks)

1. What is an embedded system?

2. Why microprocessor is used in embedded system?

3. Define Aspect ratio of the memory.

4. List the features of RAM bus.

5. What is multirate embedded system? Give three examples.

6. What is a real-time operating system?

7. Define cross-compiler.

8. What is in-circuit emulator?

9. List the major levels of abstractions in the embedded system design process.

10. List the major goals of design process.

PART B — (5 × 16 = 80 marks)

11. (a) (i) Discuss the challenges in embedded computing system design. (8)(ii) Discuss the data operations of ARM processor. (8) Or

(b) Explain the embedded system design process in detail. (16)

12. (a) Discuss the memory devices and its interfacing concepts. (16) Or

(b) Discuss the I/O devices and its interfacing concepts. (16)

13. (a) Discuss the context switch mechanism with example. (16) Or

(b) Discuss the various scheduling policies with example. (16)

14. (a) (i) Discuss the concept of programming in assembly language Vs high

level language. (6)

(ii) Discuss the tools used to download the embedded software into the

target system. (10) Or

(b) Discuss the various debugging techniques and debugging challenges. (16)

15. (a) Discuss the embedded system design issues and techniques. (16) Or

(b) Discuss the complete design of typical embedded system. (16)

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