Engineering Designing a sequential circuit using JK flip flops

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The discussion focuses on designing a 2-bit countdown counter using JK flip-flops, emphasizing the importance of understanding state transitions based on input values. When the input is 0, the flip-flops maintain their state, while an input of 1 triggers a sequence of states: 11, 10, 01, and back to 11. Participants suggest starting with a truth table, but it is noted that a state diagram is more effective for visualizing state changes and outputs. The conversation highlights the need for a structured approach, including characteristic and excitation tables, followed by Karnaugh maps for simplification. Overall, the design process requires careful consideration of state transitions and outputs for accurate implementation.
Ramir
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Homework Statement



Design [/B]:2-bit count-down counter; with two flip-flops and one input

Homework Equations


When input = 0, the state of the flip-flops does not change.
When input = 1, the state is 11, 10, 01,11, and repeat.

The Attempt at a Solution


Start with truth table, then characteristic table, and then excitation table, then Kmap?
How do I start deriving the truth table
 
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Ramir said:
How do I start deriving the truth table
The truth table is meaningless here. You need to create a state diagram (for example: [state 0, output 00, state change: On clock transition, next state:...]).
 

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