Answer:
View Image
Explanation:
I'm not sure if this is correct but this is what I got.
The black-ink part is a 2-bit counter. It basically counts up from 00₂ to 11₂ and resets. That counter will count up 1 value for every clock pulse.
Then the orange part is a comparator. It senses when the counter reaches the value 10₂ or 2₁₀. So the orange part will trigger every 2 clock pulses. The output of the orange part will trigger the reset pin to reset the count back to 00₂.
The pink-ink is a negative edge detector. It detects the negative edge of the signal and outputs a signal.
The output of the orange and pink signal goes to another comparator to trigger when both condition are met-- when the neg edge is met and when the second clockpulse hit.
