Why we have 9 values in Std_logic?

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gck

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Hi,

Why we have 9 values in Std_logic, as in real world only 3 of them exits. '1', '0' and 'Z'.


Thakk you
 

Re: why 9 values

actually the real world has more values, but most of them are erronous states.

like contention state - 'x' or using week, strong pullsups 'z', 'Z'

and ofcourse randomality - 'U' .
 

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