UGC-NET | UGC NET CS 2015 Dec – III | Question 1

The three outputs x₁x₂x₃ from the 8 X 3 priority encoder are used to provide a vector address of the form 101x₁x₂x₃00. What is the second highest priority vector address in hexadecimal if the vector addresses are starting from the one with the highest priority ?

(A) BC
(B) A4
(C) BD
(D) AC


Answer: (B)

Explanation: The priority preference for 8 X 3 priority encoder will be:

000 First 
001 Second 
010 Third
011 Fourth
100 Fifth
101 Sixth
110 Seventh 
111 Eighth 

According to question second highest priority vector address will be 10100100.
i.e. 1010 0100.
When we convert it to hexadecimal then it will be A4.
So, option (B) is correct.


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