Digital Electronics - Combinational Logic Analysis - Discussion

4. 

The 8-input XOR circuit shown has an output of Y = 1. Which input combination below (ordered A – H) is correct?

[A]. 10111100
[B]. 10111000
[C]. 11100111
[D]. 00011101

Answer: Option A

Explanation:

No answer description available for this question.

Sandeep Mandal said: (Mar 17, 2011)  
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".

Sundar said: (Mar 7, 2012)  
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.

Eng. Jojo said: (Nov 29, 2013)  
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

R C Pandey said: (May 8, 2015)  
What's an odd function?

Sunil said: (Sep 1, 2015)  
Looking the options where the number one is in odd that is the answer.

Ramya said: (Mar 23, 2018)  
Agree @Sunil.

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