Question

what are the minimum number of flip flop and gates required to design a mod-8 grey counter
options.
1) 4FFS AND 3XOR GATE
2) 8FFS AND 4AND GATE
3) 3FFS AND 2XNOR GATES
4) 3FFS AND 2XOR GATES​

Answer 1

Answer:

d is the correct one but I'm not sure

Answer 2

The correct answer to this question is option 4) 3FFS and 2XOR GATES.

Explanation:

• Modulus Counters, or MOD counters, are based on the number of states that the counter will go through before going back to its original value.  

• For instance, a 2-bit counter that tallies from 002 to 112 in binary, i.e. 0 to 3 in decimal, has a modulus value of 4 so would consequently be called a modulo-4 or mod-4 counter.  

• So for a mod-8 grey counter, we will be needing 3 flipflops and 2 XOR gates.