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Posted By: rama Member Level: Silver Posted Date: 16 Jun 2008
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2008 Anna University B.E Electronics and Communication CS1251-COMPUTER ARCHITECTURE Question paper
B.E/B.Tech DEGREE EXAMINATION, APRIL/MAY 2008
Sixth Semester
(Regulation 2004)
Electronics and Communication Engineering
CS1251-COMPUTER ARCHITECTURE
(Common to B.E (Part-time) Third Semester Regulation 2005)
Time:Three hours Maximum:100 marks
Answer ALL questions
PART A –(10*2=20marks)
1. Registers R1 and R2 of a computer contain the decimal values 1200 and 4600 .
What is the effective address of the memory operand in each of the following
instructions?
(a) Load 20(R1),R5
(b) Add -(R2),R5.
2. What is the use of Condition Code register?
3. What do you mean by End-around carry correction?
4. Discuss the role of Booth algorithm in the design of Fast Multipliers.
5. Why is the Wait-For-Memory-Function-Completed step needed when reading
from or writing to the main memory?
6. Write the sequence of control steps required for three bus structure for the
following instruction:
Add R4,R5,R6.
7. Define Locality of Reference.
8. Give the features of a ROM cell.
9. What is the difference between a Subroutine and an Interrupt-service
routine?
10. Define Bus Arbitration.
PART B-(5*16= 80 marks)
11. (a)(i) Explain in detail the different Instruction types and Instruction
Sequencing.
Or
(b) Explain the different types of Addressing modes with suitable
examples.
12. (a) Illustrate Booth Algorithm with an example.
Or
(b) Design a 4-bit Carry-Lookahead Adder.
13. (a) Write a Microroutine for the instruction, Add (Rsrc)+ Rdst where
the source and destination operands are specified in indexed and
register addressing modes, respectively.
Or
(b) Explain Microprogrammed Control Unit. What are the advantages and
disadvantages of it.
14. (a) Define Cache Mapping Functions . Explain the methods.
Or
(b) How does a virtual address gets translated into a physical address .
Explain in detail with a neat diagram. Explain the use of TLB.
15. (a) Explain the use of DMA Controllers in a computer system with a neat
diagram.
Or
(b) Explain Handshake protocol. Depict clearly how it controls data transfer
during an input operation.
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