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in one of my project i have 5 states , to which corresponds 3 flip flops . But 3 flip flops encode 8 states. My question is: the 3 unused states, when I create the Next State equation, are considered "Don't Care"? Cause later I have to create the K-Map using the excitation table for every input of the flip flop. So, what have I to write in the next state of the unused states? Thanks

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    \$\begingroup\$ don't care much as long as there's an eascape route from the illegal states to the legal states it's probably fine. \$\endgroup\$ – Jasen Nov 17 '15 at 10:43
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Just put an X to mark don't care, meaning the next stat can be 1 or 0.

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