Understanding Multiplexers
The digital traffic controllers: Routing data from many to one.
What is a Multiplexer?
A Multiplexer (MUX) is a combinational circuit that selects one input from several data lines and directs it to a single output.
If there are data inputs, then select lines are required to navigate them.
2:1 MUX Simulator
Single select line (S)
4:1 MUX Simulator
Multi-select lines (S₁, S₀)
Why MUX Matters in VLSI
Hardware Efficiency
Multiplexers reduce the number of wires required in a design, saving silicon area and improving routing congestion.
Data Steerage
They serve as the main steering logic for CPU datapaths, deciding which result (ALU, Memory, PC) reaches the register file.
Power Saving
By choosing single active paths, designers can avoid unnecessary signal switching in idle portions of the chip.