Reg No.:

Max. Marks: 100

1

2

3

4

5

6

7

8

9

10

11 ஐ
b)

12 a)

00000CS405 1219090൬൩൦:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Seventh semester B.Tech examinations (S), September 2020

Course Code: CS405
Course Name: COMPUTER SYSTEM ARCHITECTURE

PART A
Answer all questions, each carries 4 marks.

With neat sketch differentiate explicit and implicit parallelism.

Explain COMA model for Multiprocessor Systems.

Define a) Instruction issue latency b) Instruction issue rate.

Explain the significance of multiport memory.

How hardware synchronization can be achieved in a multiprocessor system.
Explain different message routing schemes.

What is meant by pipeline stalling?

Differentiate between Carry save adder (CSA) and Carry propagation adder
(CPA).

Suggest different methods to overcome asynchrony problem.

Explain distributed caching.

PART B
Answer any two full questions, each carries 9 marks.

Define Amdahl’s Law.

Consider the execution of an object code with 200,000 instructions on a 40-
MHz processor. The program consists of four major types of instructions. The
instruction mix and the number of cycles (CPI) needed for each instruction type

are given below based on the result of a program trace experiment.

Instruction type CPI Instruction mix
Arithmetic and logic 1 56%
Load/store with cache hit 2 22%
Branch 10%
Memory reference with cache miss 12%

Calculate the average CPI, MIPS rate and Execution time.

Compare RISC and CISC scalar processor architectures.

Page lof 3

Duration: 3 Hours

Marks
(4)
(4)
(4)
(4)
(4)
(4)
(4)
(4)

(4)
(4)

(3)
(6)

(4)