If you want to create a MOD-3 counter using J-K flip-flops in Simulink and as there is no direct CLR (Clear) or PR (Preset) port in the J-K flip-flop block, you can implement the clear and preset functionality using additional logic gates.
Here's how you can create a MOD-3 counter using J-K flip-flops:
1. Create the J-K Flip-Flops:
- Place two J-K Flip-Flop blocks from the Simulink library onto your model.
2. Connect the Clock Signal:
- Connect a clock signal to the clock (CLK) inputs of both J-K Flip-Flops.
3. Implement the Clear and Preset Functionality:
- Since the J-K Flip-Flop block in Simulink might not have direct CLR (Clear) or PR (Preset) ports, you can use additional logic gates to achieve these functions.
- For the first J-K Flip-Flop (FF1):
- Connect the J input to an AND gate:
- One input of the AND gate should be your desired preset signal.
- The other input of the AND gate should be your clock signal inverted using a NOT gate.
- Connect the K input to an AND gate:
- One input of the AND gate should be your desired clear signal.
- The other input of the AND gate should be your clock signal inverted using a NOT gate.
- For the second J-K Flip-Flop (FF2):
- Connect the J input to an AND gate:
- One input of the AND gate should be your desired preset signal.
- The other input of the AND gate should be the output of FF1 (Q1).
- Connect the K input to an AND gate:
- One input of the AND gate should be your desired clear signal.
- The other input of the AND gate should be the output of FF1 (Q1).
4. Connect the Feedback Logic:
- Connect the Q output of FF1 to the J input of FF2.
- Connect the Q output of FF2 back to the K input of FF2.
5. Create the Output:
- Connect the Q outputs of the J-K Flip-Flops to your output or display blocks to observe the counter's behavior.
By following these steps, you can create a MOD-3 counter using J-K flip-flops in Simulink, implementing clear and preset functionality using additional logic gates as needed. Be sure to configure the preset and clear signals according to your specific requirements.
