Why is W=0 not included in the excitation table for counters?

AI Thread Summary
In designing a 3-bit up/down counter using T flip-flops, the inclusion of AND gates in the final multiplexer is essential for controlling the counting direction. The excitation table typically omits W=0 because it does not represent a valid state transition for the counter's operation. Understanding the role of XOR gates in JK flip-flops is also crucial for managing state changes. For further clarity, researching online resources specifically about 3-bit up/down counters can provide additional insights. The discussion emphasizes the importance of grasping these concepts for effective counter design.
Sinister
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Hi guys.

I'm wondering if someone could explain why when trying to make a 3 bit up/down counter using T flip flops, there are two and gates connected to the final multiplexer ?

Can someone explain how you approach this?

And same with the JK Flip flop but with an xor gate.

I'm really confused on how you come up with this.

Thanks.
 
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When doing a Google search on "3 bit up/down counter using T flip flops" it appears to be a homework problem. May I suggest you Google search those many sites and find your answers there?
 
When we are doing the excitation table for counters...why is the W=0 for the next state not included?
 

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