VTU Computer Science (Semester 4)
Computer Organization
June 2013
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) With a neat block diagram, discuss the basic operational concepts of a computer.
6 M
1 (b) List the different systems used to represent a signed number and give one example for each. Specify which number representation system is preferred in a computer and why?
4 M
1 (c) Perform the following operations on the 5-bit signed using 2's complement representation system. Also indicate whether overflow has occurred.
i) (-10)+(-13)
ii) (-10)-(+4)
iii) (-3)+(-8)
iv) (-10)-(+7).
10 M

2 (a) Define addressing mode. Explain the following addressing modes with an example for each:
i) Index addressing mode
ii) Indirect addressing mode
iii) Relative addressing mode
iv) Auto decrement addressing mode.
10 M
2 (b) With a neat block diagram, describe the input and output operations.
5 M
2 (c) Discuss briefly encoding of machine instructions.
5 M

3 (a) With neat sketches, explain various methods for handling multiple interrupt requests.
12 M
3 (b) Define bus arbitration. Explain in detail any one approach of bus arbitration.
8 M

4 (a) With a neat diagram, explain in detail the input interface circuit.
10 M
4 (b) List out the functions of an I/O interface.
3 M
4 (c) Discuss briefly the protocols of universal serial bus.
7 M

5 (a) Briefly explain any two cache mapping functions.
6 M
5 (b) With a neat diagram, explain the translation of a virtual address to a physical address.
8 M
5 (c) Discuss in detail any one feature of memory design that leads to improve performance of computer.
6 M

6 (a) Perform signed multiplication of numbers (-12) and (-11) using Booth's algorithm.
8 M
6 (b) Given A=10101 abd B=00100 perform A/B using restoring division algorithm.
8 M
6 (c) Design a logic circuit to perform addition / subtraction of two 'n' bit numbers X and Y.
4 M

7 (a) Write down the control sequence for the instruction Add, R4, R5, R6 for three - Bus organization.
4 M
7 (b) With a neat sketch, explain the organization of a micro programmed control unit.
8 M
7 (c) With an example, explain the field coded micro instructions.
8 M

8 (a) Describe the working of message passing multicomputer (MPM) architecture.
8 M
8 (b) Briefly explain any two parallel computer architecture.
8 M
8 (c) List out any four differences between shared memory multiprocessor and cluster.
4 M



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