So I'm having an issue of implementing an 8 bit counter from two 4 bit counters. The first 4 bit works when initiated by the clock pulse and so does the second separately with its own clock pulse. How could I use just one clock to send pulses to have the counter count from 00000000 to 11111111 without having to use two clocks to do so? I'm planning to make a 12 bit and 16 bit the same way and since I plan to make devices out of these to use for a bigger project it'd make sense to understand how to make an 8 bit first.
Key information : I3 is the most significant bit, I0 is the least significant.
Cout is the probe connected to the d flip flop in each 'circuit'.