EE101Lecture8

EE101Lecture8 - Introduction to Digital Logic Lecture 8...

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© Mark Redekopp, All rights reserved Negative Logic Recall it is up to us humans to assign meaning to the two voltage levels Thus, far we‟ve used (unknowingly) the positive logic convention where 1 means true and 0 means false In negative logic 0 means true and 1 means false volts time 1=true/on 0=false/off volts time 1=false/off 0=true/on Negative Logic Convention Positive Logic Convention (Value/Meaning) (Value/Meaning)
© Mark Redekopp, All rights reserved Negative Logic „AND‟ Function X Y Z 0 0 0 0 1 0 1 0 0 1 1 1 X Y Z 1 1 1 1 0 1 0 1 1 0 0 0 X Y Z 0 0 0 0 1 1 1 0 1 1 1 1 P.L. AND X Y Z P.L. P.L. P.L. AND X Y Z N.L. AND N.L. N.L. N.L. AND X Y Z N.L. N.L. Traditional AND gate functionality assumes positive logic convention Given negative logic signals, we can invert to positive logic, perform the AND operation, then convert back to negative logic However, we then see that

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