project overview
For this project we are constructing a 60 second time. we used multi sim PLD mode to create a circuit to count from 00 to 59 and reset to 00 after reaching 59 and continue counting.
pld circuit
This project and the previous project the DMV counter both used a similar system for the seven segment displays where we had to use both the tens and ones place. Therefore the creation of the multisim was very similar. But they were different because for this project when it hit 60 it automatically reset to zero and continued counting but never actually showed 60, as to where the dmv project stoped once it showed 80
final project conclusions
The main difference between synchronous and asynchronous counters is synchronous counters are all connected to the clock so they are synchronized and there is no ripple affect. Asynchronous counters are connected to the clock through the previous counter which causes a slight delay because the clock pulse has to go through the previous counter so they are not synchronized this is know as the ripple affect.
The 163 is a synchronous that only can only increase but unlike the 193 it resets at the number you want it to not the one after. The 193 gate is asynchronous so it resets one number past the actual number you want it to show but the 193 only can count up
First I read the directions to figure out what I had to build to solve the problem. I quickly figured out that this project would be similar to the last and my multisim implementation from the DMV project could be used to make this project. Only part of the previous project worked though so I had to remake some of it because this project needed to go to 59 and reset where the last one had to go to 80 and stop so different chips and wiring were needed. After constructing the circuit on multisim PLD mode I got a breadboard and a chip. Because most of the chips were broken acquiring a working chip was difficult so I used a broken one as a template. The broken chip allowed me to match the pins from my multisim to the chip. After the circuit worked on the screen and I made the board to what I thought was correct and had two classmates check I to see if it was right, Zach caught one small wiring issue where one of my wires was one pin off. Then after I thought it was perfect I got a working chip and then I had to transfer the circuit to the chip and test it. I had one small problem with the switch and how I wired with how my pin was put on my multisim so I had to download it to the chip again, but after I fixed it, it worked perfectly.
Most of my classmates had very similar circuits because we used a template created by Mrs. Zienty for our output pins so much of the wireing was the same
The 163 is a synchronous that only can only increase but unlike the 193 it resets at the number you want it to not the one after. The 193 gate is asynchronous so it resets one number past the actual number you want it to show but the 193 only can count up
First I read the directions to figure out what I had to build to solve the problem. I quickly figured out that this project would be similar to the last and my multisim implementation from the DMV project could be used to make this project. Only part of the previous project worked though so I had to remake some of it because this project needed to go to 59 and reset where the last one had to go to 80 and stop so different chips and wiring were needed. After constructing the circuit on multisim PLD mode I got a breadboard and a chip. Because most of the chips were broken acquiring a working chip was difficult so I used a broken one as a template. The broken chip allowed me to match the pins from my multisim to the chip. After the circuit worked on the screen and I made the board to what I thought was correct and had two classmates check I to see if it was right, Zach caught one small wiring issue where one of my wires was one pin off. Then after I thought it was perfect I got a working chip and then I had to transfer the circuit to the chip and test it. I had one small problem with the switch and how I wired with how my pin was put on my multisim so I had to download it to the chip again, but after I fixed it, it worked perfectly.
Most of my classmates had very similar circuits because we used a template created by Mrs. Zienty for our output pins so much of the wireing was the same