Overview
This project was meant to create a display that advances by 1 each time a button is pushed until it reaches 80 at which point the reset button i pushed and a new employee will begin again.
Multisim Circuit
PLD Circuit
A PLD circuit is different from a Design Mode circuit because a PLD circut can be uploaded to a PLD board by using input and output pins and transferring it with a USB cord where a Design circuit can only be run on the computer itself and has no interface to a board. Pins in the Multisim can be assigned and uploaded to a chip so that it can be uploaded to the board.
Bill of Materials
- 1 PLD Board
-1 Breadboard Buddy PLD chip
-a lot of wires
-1 Breadboard Buddy PLD chip
-a lot of wires
Final Project Conclusions
The difference between SSI and MSI is the complexity of the components. This board has a large number of gates making it MSI. The ripple effect is caused by a small delay in counters that is visible as small flashing in-between states. The premise of the circuit is that the lower counter cycles through the numbers 0-9 to represent the ones digit and then when it resets it sends a signal for the flip flops at the top to show an increase of 1 which represents the tens digit. To have it stop when the display reaches 80, the fourth flip flops output is inverted and put into a nand gate which then stops the counter at the bottom. The clock is only connected to the lower counter since it triggers the flip flops at the top. Then the multiplexers take these signals to outputs so they can be shown on the seven seg on the PLD board. I didn't see any of my other classmates circuits but I assume some of them may not have simplified so their gates may have been organized a little differently.