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i got these waveforms ...
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This picture is too small and low quality we cannot see the actual waveforms.
And without the test it is impossible to tell whats going on. But the appearance of U or X usually means that something is driving them that way.
You should be able to add any signal to the wave window to trace back the drivers to see what is causing the problem.
There isnt anything obviously wrong in your code., other than not assigning next_state and finito in the "others" case to cover their state when current state is "10" or "UU" or "XX". It could be something to do with this.
Otherwise I can only assume a test bench issue.
Honored Contributor
