Digital Electronics - Combinational Logic Analysis - Discussion
Discussion Forum : Combinational Logic Analysis - General Questions (Q.No. 4)
4.
The 8-input XOR circuit shown has an output of Y = 1. Which input combination below (ordered A – H) is correct?
Discussion:
6 comments Page 1 of 1.
Ramya said:
7 years ago
Agree @Sunil.
Sunil said:
10 years ago
Looking the options where the number one is in odd that is the answer.
R c pandey said:
1 decade ago
What's an odd function?
Eng. Jojo said:
1 decade ago
XOR is odd function, so if :
# of 1 is odd , y = 1.
# of 1 is even , y = 0.
So when look to the options,
In option a : # of 1 = 5 (odd) so y =1
# of 1 is odd , y = 1.
# of 1 is even , y = 0.
So when look to the options,
In option a : # of 1 = 5 (odd) so y =1
Sundar said:
1 decade ago
Option A = 10 11 11 00
A XOR B = 1 XOR 0 => 1
C XOR D = 1 XOR 1 => 0
E XOR F = 1 XOR 1 => 0
G XOR H = 0 XOR 0 => 0
(A XOR B) XOR (C XOR D) = 1 XOR 0 => 1 .....(1)
(E XOR F) XOR (G XOR H) = 0 XOR 0 => 0 .....(2)
(1) XOR (2) = 1 XOR 0 => 1.
Hence the Option A is correct.
A XOR B = 1 XOR 0 => 1
C XOR D = 1 XOR 1 => 0
E XOR F = 1 XOR 1 => 0
G XOR H = 0 XOR 0 => 0
(A XOR B) XOR (C XOR D) = 1 XOR 0 => 1 .....(1)
(E XOR F) XOR (G XOR H) = 0 XOR 0 => 0 .....(2)
(1) XOR (2) = 1 XOR 0 => 1.
Hence the Option A is correct.
(1)
SANDEEP MANDAL said:
1 decade ago
We know that in XOR gate same input is 0 and different input is 1.
For eg, suppose A=1 and B=1 i.e same input. So the result will be 0.
So the correct answer is "A".
For eg, suppose A=1 and B=1 i.e same input. So the result will be 0.
So the correct answer is "A".
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