Designing an 8×1 Multiplexer

How to Design 8*1 Multiplexer

Multiplexers are used to convert parallel data signals into a single serial signal. They have 8 input lines, three selection lines and one output line. Multiplexers are very common in digital systems. They are also known as combinational circuits.

To select among 2m input lines, n selection bits are required. This requires n 21 multiplexers.

Enable input

A multiplexer is a combinational circuit that selects binary information from many input lines and routes it to a single output line. Multiplexers are used in digital systems to reduce the number of transmission lines and save bandwidth. There are several different modeling styles for multiplexers, but the most common is gate-level modeling.

A gate-level model uses simple logic gates to create a complex digital circuit. The circuit can then be tested to verify its functionality. A multiplexer has four data input lines and two select lines. Depending on the value of the select lines, one input is selected and transmitted to the output line.

To implement a full adder using a 8:1 multiplexer, you need to use 5 lines to control the cascaded MUXes. There are two lines that control the first MUX and another three that control the second MUX. To control the second MUX, you need to use a NOT gate. Then, you can connect the output of the second MUX to the input of the first MUX.

Select line

The select line on a multiplexer is an important component of the logic circuit. It controls the switching of the multiplexer’s output. Depending on the input code on lines a and b, the select line will connect one of the two data outputs to the output. This is shown in the block diagram below.

A multiplexer is a combinational circuit that has many data inputs and a single output depending on the value of its control or select inputs. This type of circuit is also known as a many to one circuit or parallel to serial convertor.

The multiplexer has eight data inputs D0 through D7, three selection lines S0 through S1 and a single output Y. The selection lines are connected to the inputs of the AND gates and to the output of the OR gate. Depending on the combination of the selection lines, the multiplexer will switch the output between D0 and D1. The Boolean expression for this is shown below.

Reset line

A multiplexer is a device that connects many input signals to one output signal. This is often used in a computer or a digital circuit to select the correct data to transmit to an output. There are several different multiplexer circuits, but they all consist of two transmission gates and complementary control signals. A 3-to-1 multiplexer consists of three input lines D0, D1, and S, and an output line Y. The multiplexer switches the output to either of the inputs based on the selection signal.

The Verilog module for an 8-to-1 multiplexer demonstrates the functionality of this device using eight 8-bit ports In1 to In8 and a 3-bit selection port Sel. The output port Out represents the output of the multiplexer based on different selections of Sel. The module also includes a test bench that verifies the functionality of the multiplexer.


A multiplexer is a type of electronic switch that combines multiple input data signals into a single output signal. It also converts parallel data streams into serial signals, which can be transmitted over long distances. Multiplexers are used in telecommunication, test and measurement, military/aerospace, and data communications applications.

A simple 8 to 1 multiplexer has a total of eight data input lines, i.e., A0 through A7, three selection lines S0, S1 and S2 and a single output, i.e., Y. The multiplexer decodes the combination of input data bits given through the select lines and enables one of them to connect to the output line.

Multiplexers can be built from basic logic gates such as AND, OR and NOT. However, they are more commonly found as a part of an integrated circuit (IC). For example, the popular TTL 74LS151 has an 8-input to 1-line multiplexer. There are also ICs that offer dual 4-input to 1-line multiplexers.

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