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Institute of Chartered Financial Analysts of India (ICFAI) University 2006 B.E Computer Architecture - exam paper

Monday, 17 June 2013 09:30Web

Note : Attempt any three ques. in all. Q1 is compulsory. every ques. carries 10 marks.
Time : 11/2 Hours
Maximum Marks : 30
Computer Architecture


( a )

How many bits wide memory addresses have to be if the computer had 16 MB of memory? (Use the smallest value possible)


( b )
Derive the accurate floating point representation of the decimal numbers +3.5 and -2.1 using the 32 bit IEEE 754 floating point standard. 2
( c ) Consider the subsequent floating points:
Mantissa of X = 110011, Exponent of X = 1100111
Mantissa of Y = 000001, Exponent of Y = 1101111
Perform operations X + Y. 1.5
( d ) Differentiate ranging from Selective repeat Set and Selective Compliment. 2
( e ) The subsequent transfer statements specify a memory. discuss the memory operation in every case
i) R2 <- M[AR] ii) M[AR] <- R3 1.5
( f ) Differentiate ranging from Classical method and 1 Hot method of Control Design. 1.5


( a )

Design an arithmetic circuit with 1 selection input S and 2 n-bit data inputs A and B. The circuit generates the subsequent 4 arithmetic operations:

S Cin=0 Cin=1
0 D = A + one D = A + B
1 D = A + B + one D = A - 1

1 + 4*1

( b )

A digital computer has a common bus system for 12 registers of nine bits every. The bus is constructed with multiplexers.


How many selection inputs are there in every multiplexer? [1]

What size of multiplexers are needed? [1]

How many multiplexers are there in the bus? [1]

Draw a diagram of the bus system using three-state buffers and a decoder instead of multiplexers? [2]


( a )
The system uses a control memory of 1024 words of 32 bits every. The microinstruction has 3 fields for micro-operations. choose a status bit and Brach address field. The micro-operation field has 16 bits.

1. How many bits are there in the branch address field and choose field?
2. If there are 16 status bits in the system, how many bits of the branch logic are used to choose a status bit?
3. How many bits are left to choose the input to the multiplexers?


( b )
The contents of the PC in the basic computer is 3AF (all numbers in HEX). The contents of AC are 7EC3. The contents of memory at address 3AF are 09AC. The contents of memory at address 9AC is 8B9F. presume op-code 001 stands for ADD operation.

1. What is the instruction that will be fetched and executed next?
2. Show the binary operation that will be performed?
3. provide the contents of registers PC, AR, DR, AC and IR in hexadecimal at the end of the instruction cycle.

0.5 +
0.5 +


( a )
Write a program to evaluate the arithmetic statement:

1. Using a general register computer with 3 address instructions.
2. Using an accumulator kind computer with 2 address instructions.
3. Using an accumulator kind computer with 1 address instructions.
4. Using a stack organized computer with zero address instructions.


( b )
A 2 word instruction is stored in memory at an address designated by the symbol W. The address field of the instruction (stored at W+1) is designated by the symbol Y. The operand used during the execution of the instruction is stored at an address symbolized by Z. An index register contains the value X. State how Z is computed from the other addresses if the addressing mode of the instruction is: (Give explanation also)

1. Direct
2. Indirect
3. Relative
4. Indexed
5. Immediate

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