Enable inputs
Many devices have an additional enable input, which “activates” or “deactivates” the device.
We could design a 2-to-1 multiplexer with an enable input that’s used as follows.
—EN=0 disables the multiplexer, which forces the output to be 0. (It does notturn off the multiplexer.)
—EN=1 enables the multiplexer, and it works as specified earlier.
Enable inputs are especially useful in combining smaller muxes together to make larger ones, as we’ll see later today.
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