I implemented a 4-bit shift register using D flip-flop on the breadboard. but How do you implement the timing diagram for the following picture? I understood that i should connect clk signal through NOT gate to the d flip-flop's clk hole because Q reacts when the clk signal drops from 1 to 0, but I wonder how I can implement Q1 values to be continuously 1 and Q2,3,4 to be on and off in the middle. (Note: Q1, 2, 3, 4 can be visually checked through the led element.)