Project Overview
In this project we are required to build a circuit on multisim that counts from 0-59 and then restarts, but can also be restarted by a reset switch.
Multisim Circuit
Conclusion
- Synchronous counters are different because they work in harmony with each flip flop. Each flip flop is connected to a clock so no unit has has to wait for the previous FF, canceling out the ripple effect. On the other hand, Asynchronous circuits are only connected to one clock at the beginning FF unit and that single clock drives the rest of the units, which creates the ripple effect.
- The 74LS163 chip is a pre-loadable count start, synchronous load and clear, 4 bit up counter. This chip is only able to count up 4 bits. While the 74LS193 chip is a asynchronous load, 4 bit up or down counter. The 193 can count up or down but still had the limitation of 4 bits.
- When I start the simulation of my circuit, my one's place starts to count due to the clock that is connected to the 74LS163 chip. The chip is programmed to star at zero because all of the inputs on the left side of the chip, that loads the starting number, are connected to ground. The counter then counts to 9 and then resets to zero. This is because the circuit is made so that the active low load will detect a 1 every time until 9 is detected, sending a 0 to the load, resetting the count. To power the tens place, I used the output that is going to load, connected it to the tens place CLK, and added a inverter to the wire so that the tens place circuit will detect a 0 until the ones place resets to zero, providing a 1. With this system the tens place will continue to count up by 1 every time the ones place is reset to zero. The tens place is wired to detect 6 so that it will display a 5 and then reset to 0. After this, the load side of the tens circuit is broken and an AND gate is connected so that the second input can be the switch. The Clear of the ones place is also connected to the switch output. The reset switch is set up as such that when switched to ground the connection for the tens place will be broken resetting the display to zero, ans the active low clear on the 74LS163 chip will be activated, resetting the ones display to zero also. This should complete the circuit.
- Yes my fellow classmate Silas Cascio made a different looking circuit from what I made. It was different from mine because he had a lot more logic than I used in me circuit.