A D flip flop will output whatever logic level is present at

A D flip flop will output whatever logic level is present at the D input when the clock input (Clk) is set high. what is the output for each of the variables in the circuit below? What would you name the circuit? Assume in the initial state both Q1 and Q2 are logic low (=O V). Please show steps

Solution

Initial state D1=Q2 Q1 D2=Q1 NoR Q2 Q2

0 0 1 0

Clk 1 1 0 0 1

Clk 2 0 1 0 0

Clk 3 0 0 1 0

Repeats same if you look at Q1 and Q2

they are 00 01 10 00 and repeats the cicruit behaves as a Mod 3 counter

So name of the circuit is Mod 3 counter