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Tri-State Buffer
See slides Lesson 3.pdf>page=24
A way to connect different signals to one wire.
If signals were connected directly together, it may result in short. The Tri-State buffer prevents this.
An enable signal can make the output completely disconnected from the input.
Tri-State meaning $\text{HIGH}$, $\text{LOW}$ or $\text{HI-Z}$ (high impedance/disconnected).
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