The sequence in which the counter works is as follows :
7: 0111
3: 0011
5: 0101
1: 0001
6: 0110
2: 0010
4: 0100
0: 0000
Here’s how the counter works : first, all the three flip flops are set to 1 then for changing the inputs i have used the switch 1 of the Dip switch.
When the count signal is triggered, the first flip-flop (least significant bit) toggles from 1 to 0, which produces the binary number 0111 (decimal 7).
The second count signal should not trigger a change in the counter value, as the next count is 3, not 6.
The third count signal triggers a change in the counter value, where the second flip-flop toggles from 1 to 0, which produces the binary number 0101 (decimal 5).
The fourth count signal should not trigger a change in the counter value, as the next count is 1, not 4.
The fifth count signal triggers a change in the counter value, where the first flip-flop toggles from 0 to 1, and the third flip-flop toggles from 0 to 1, which produces the binary number 0110 (decimal 6).
The sixth count signal should not trigger a change in the counter value, as the next count is 2, not 5.
The seventh count signal triggers a change in the counter value, where the second flip-flop toggles from 0 to 1, which produces the binary number 0100 (decimal 4).
The eighth count signal triggers a change in the counter value, where all three flip-flops toggle from 0 to 1, which produces the binary number 0000 (decimal 0).
The counter stays at 000 until the count signal is triggered again, which causes all three flip-flops to be set back to 1, and the counting process starts again from the beginning of the sequence.
In summary, the 3-bit asynchronous down counter counts down in the sequence 7, 3, 5, 1, 6, 2, 4, 0 using three flip-flops and asynchronous inputs to trigger each flip-flop in the sequence.
How to test
For Testing this project, the user has to use the switch 1 of the dip switch to give different inputs and then get the desired output on the 7-segment display.