Computer Architecture and Organization - Study Material and Solved Assignments

This document contains solved assignments and study material on Computer Architecture and Organization. It includes conversions, representation of values, and proofs using Boolean algebra identities. The subject code is ITC544.

Running head: COMPUTER ARCHITECHTURE AND ORGANIZATION
Computer Architecture and Organization
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Subject Code: ITC544
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COMPUTER ARCHITECHTURE AND ORGANIZATION
Table of Contents
Question 1:.......................................................................................................................................2
a.) Determining the value of base x if (152) x = (6A) 16............................................................2
b) Conversions.............................................................................................................................2
c) Representation of value..........................................................................................................5
Question 2:.......................................................................................................................................5
a) Prove........................................................................................................................................5
b) Using basic Boolean algebra identities for Boolean variables x, y, and z, for prove..............7
c) Prove:......................................................................................................................................7

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COMPUTER ARCHITECHTURE AND ORGANIZATION
Answer to Question 1:
a.) Determining the value of base x if (152) x = (6A) 16
Let the value of base be X,
Given,
(152) x = (6A) 16
Or, X^2 + 5X + 2*X = 6*16 + A
Or, X^2 + 5X + 2*X = 6*16 + 10
X2 + 5X + 2 = 106
X^2 + 5X- 104 = 0
X^2 + 13X- 8X – 104 = 0
X (X + 13) – 8(X + 13) = 0
(X - 8) (X + 13) = 0
X = 8 and X = -13
Hence, X is 8.
The value of the base is 8.
b) Conversions
i) BED16 converting to base-3
Solution:

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COMPUTER ARCHITECHTURE AND ORGANIZATION
= B * 16*16 + E * 16 + D
= 2816 + 224 + 13
= (3053)10
(3053)10 =
3 3053
3 1017 2
3 339 0
3 113 0
3 37 2
3 12 1
3 4 0
3 1 1
So, (BED)16 = (11012002)3
ii) 3217 into 2-base (binary) representation
Solution:
(321)7 = (3 * 72) + (2 * 71) + (1 * 70)
= (162)10
Again, (162)10 =
2 162

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COMPUTER ARCHITECHTURE AND ORGANIZATION
2 81 0
2 40 1
2 20 0
2 10 0
2 5 0
2 2 1
2 1 0
Hence, (162)10 = (10100010)2
iii) (1235)10 conversion to octal representation
Solution:
8 1235
8 154 3
8 19 2
8 2 3
Hence, (1235)10 = (2323)8
iv) 21.218 conversion to decimal representation
Solution:
21.218 = (2 * 81) + (1 * 80). (2 * 8-1) + (1 * 7=8-2)
= 17 + 0.25 + 0.015625

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COMPUTER ARCHITECHTURE AND ORGANIZATION
= 17.265625
c) Representation of value
i) One's complement
Highest Value is 011
Lowest Value is 100
ii) Two's complement
Highest Value is 011
Lowest Value is 101
iii) Signed Magnitude
Highest Value is 011
Lowest Value is 111
Question 2:
a) Prove
The expression for the logic diagram is: (a.b)’
Truth table of the expression is provided below:
A b a.b (a.b)’
0 0 0 1

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COMPUTER ARCHITECHTURE AND ORGANIZATION
0 1 0 1
1 0 0 1
1 1 1 0
The expression of the logic diagram
a’ + b’
The truth table for the expression is provided below:
A b a’ b’ a’ + b’
0 0 1 1 1
0 1 1 0 1
1 0 0 1 1
1 1 0 0 0
Hence, LHS = RHS (Proved)

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COMPUTER ARCHITECHTURE AND ORGANIZATION
b) Using basic Boolean algebra identities for Boolean variables x, y, and z, for prove
The expression derived from the given circuit
A’. B’ + A.B = X
The given circuit that can be minimized from given circuit is:
c) Prove:
X’ + Y’ + XYZ’
= X’ + Y’ + (X’ + Y’ + Z)’ [ by De-Morgan’s Law]
= (XY (X’ + Y’ + Z))’ [ by De-Morgan’s Law]
= (XX’Y + XYY’ + XYZ)
= (0 + 0 + XYZ)

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COMPUTER ARCHITECHTURE AND ORGANIZATION
= (XYZ)’
= X’ + Y’ + Z’ [ by De-Morgan’s Law]
Hence, X’ + Y’ + XYZ’ = X’ + Y’ + Z’ [PROVED]