Combinational Building Blocks

2/1 Multiplexor (MUX)

I0

I1

Y

S

if S = 0, then Y = I0if S = 1, then Y = I1 Y = I0 S’ + I1 S

I0

I1

Y

S

A[3:0]

B[3:0]

D[3:0]

Muxes often use to select groups of bits arranged in busses.

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