Overview
This project was basically a modification on the DMV one except we were asked to use J/K flip flops instead of D and we also had to use a 163 instead of a 193 counter. The circuit is designed to output to a seven seg that will show a count from 0 to 59 then reset and has a button as the trigger for a reset at any point.
Multisim Circuit
PLD Board
This project was basically a modified version of the DMV circuit. I actually built from that circuit in Multisim and found that i could replace components and change a few parts so that I didn't have to rebuild the entire thing. I was also able to use the same breadboard wiring since I kept the connections on the Multisim the same.
Final Project Conclusions
This project presented some unique difficulties. The circuit didn't work in the way that I had originally expected it to. First, the difference between a synchronous counter and an asynchronous counter is that a synchronous counter runs based on the clock while an asynchronous counter does not. I like to think about it like a synchronous counter is in "sync" with the clock. Second, a 163 counter displays the exact binary number that it is programmed to, while a 193 counter uses the highest number as a trigger and only displays one number below that. In order to build this circuit I actually started with my DMV PLD circuit. To start, I had to remove one of the flip flops since I was only counting to 5 in my tens digit so I only needed 3. Then I replaced my D flip flops with J/K flip flops. Both J and K, and the preset were connected to power. Each Q was connected to a probe and then each not Q was connected to the clock of the next flip flop. I was able to keep my gates the same except I had to connect the wires from the outputs to display a 5. Then, on the counter at the bottom I had to switch the inputs to display a 9 instead of a 10 since a 163 displays the exact number that it receives. I didn't see anyone else's circuit but I would expect some variation in the approach that people took in taking the outputs of the bottom counter to the flip flops, especially if they didn't build from the DMV counter.