Why sel=11 when the output is not f and question mark said don't care about the bit number, isn't it

CodePudding user response:

? Should be an unknown state, 0 and 1 are voltage threshold judgment, is beyond the scope? the

CodePudding user response:

"?" Is a high impedance state z another symbol, in the representation of a digital character "?" And Z or Z are equivalent, can replace each other,

CodePudding user response:

refer to the second floor Smart_Devil response:

"?" Is a high impedance state z another symbol, in the representation of a digital character "?" And Z or Z are equivalent, can replace each other,

thank you