60 second timer
In this project we had to construct a circuit that would count to 59 and then reset back to zero, continuing to count afterwards.
PLD Circuit
This project is similar to the DMV display because it needed to go to two displays, and it had the same basic mechanism for counting where the 10s would increase by one after the 1s hit nine. It is different because instead of stopping at 60, this circuit resets to zero and continues counting.
Conclsuions
The synchronous counters have each gate connected to the clock which eliminates the ripple effect of the clock signal passing through the gates one at a time. The asynchronous counters are connected in a way that the clock signal goes into one counter and it is then passed through the counters that follow it.
the 163 gates are synchronous counters which are able to only go in increasing, but does have a set able range at both the start and end. Also, this is the only gate where the gate resets on the desired number, by wiring the desired number instead of the one after it. The 193 gates are asynchronous and have to be wired so that the number after the desired number is the one that resets it. This counter is only able to up count, and can only start at 0.
First, i copied in the demultiplexer setup form Ms. Zienty's website. Then I used the DMV circuit from the previous project as a basis for the setup of this project, because both these projects need to connected in a way that when the 1s get past 9 the 10s need to increase by one, eventually stopping at a certain number. after that I replaced all of the gates in the DMV circuit so that they matched the desired gates in the project description, i.e. changing the 193 to a 163. After doing the wiring to make the counters work with the new chips in place, I went to work on the reset logic, where the reset switch and the logic for the 10s counter are connected to the clears on the 10s counters with a nor gate. This allows the circuit to reset at the switch or when the counters reach 60.
No, all of our circuits looked relatively similar