Multiplexer

Question 1

What is the minimum size of ROM required to store the complete truth table of an 8-bit × 8-bit multiplier?

A
32 K × 16 bits
B
64 K × 16 bits
C
16 K × 32 bits
D
64 K × 32 bits
       Digital-Logic-Design       Multiplexer       GATE 2004-IT
Question 1 Explanation: 
Input: 2 lines, 8 bits each
Possible combination in ROM = (28 × (28) [size of truth table]
= 216
= 64 KB
= 64 K ×16 bits
Question 2

Consider the circuit in below figure. f implements

A
B
A + B + C
C
A ⊕ B ⊕ C
D
AB + BC + CA
       Digital-Logic-Design       Multiplexer       GATE 1996
Question 2 Explanation: 
Question 3

A logic network has two data inputs A and B, and two control inputs C0 and C1. It implements the function F according to the following table.

Implement the circuit using one 4 to 1 Multiplexer, one 2-input Exclusive OR gate, one 2-input AND gate, one 2-input OR gate and one Inverter.

A
Theory Explanation.
       Digital-Logic-Design       Multiplexer       GATE 1996
Question 4

A multiplexor with a 4 bit data select input is a

A
4:1 multiplexor
B
2:1 multiplexor
C
16:1 multiplexor
D
8:1 multiplexor
       Digital-Logic-Design       Multiplexer       GATE 1998
Question 4 Explanation: 
For 'n' bit data it selects 2n : 1 input
For 4 bit data it selects 24 : 1 = 16: 1 input
There are 4 questions to complete.

Access quiz wise question and answers by becoming as a solutions adda PRO SUBSCRIBER with Ad-Free content

If you have registered and made your payment please contact solutionsadda.in@gmail.com to get access