# Vhdl code for 8 to 1 multiplexer using structural modelling installer

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Here we provide example code for all 3 method for better understanding of the language. I am a student and have just started learning vhdl.\
&#x20;![Vhdl code for 8 to 1 multiplexer using structural modelling installer](http://4.bp.blogspot.com/_7iSe0IE7ItA/R4ruTuxBVMI/AAAAAAAAAlQ/-v_LWKNQYw8/s320/4x1_muxf.JPG)\\

A simple block diagram of 8:1 multiplexer is shown here. This type of operation is usually referred as multiplexing.\
&#x20;![Vhdl code for 8 to 1 multiplexer using structural modelling installer](http://online.pubhtml5.com/fald/njzl/files/large/301.jpg)\\

**Using VHDL to Describe Multiplexers** - Seven display consist of 7 led segments to display 0 to 9 and A to F. Any of these inputs are transferring to output ,which depends on the control signal.\
&#x20;![Vhdl code for 8 to 1 multiplexer using structural modelling installer](https://image.slidesharecdn.com/alu-project-140201111441-phpapp02/95/designing-of-8-bit-arithmetic-and-logical-unit-and-implementing-on-xilinx-vertex-4-fpga-34-638.jpg?cb=1391253372)\\

We can also say that a multiplexer is a device for switching one of several signals to an output under the control of another set of binary inputs. Now let's look at the properties of a 4-to-1 multiplexer. The 8-to-1 for 3 select inputs and 16-to-1 for 4 select inputs are the other common multiplexers. Data inputs can also be multiple bits. Now let's look at the 4-to-1 4-bit Bus Multiplexer. Similarly, an 8-to-1 or a 16-to-1 multiplexer with multiple data bus can be defined. We are going to briefly look into each form for a 4-to-1 multiplexer. Please note: these constructs can be extended to larger multiplexer circuits, such as 8-to-1 or 16-to-1 multiplexers. Applications of Multiplexers Multiplexers are used for different applications. Single-Channel Data Selection From the introduction of the multiplexers in the first section, we can see that a multiplexer can be used to switch the select inputs to choose one data source to the multiplexer output. Multi-Channel Data Selection Look at the following design, it is based on a quadruple 4-channel 2-to-1 multiplexer. The following 4-to-1 multiplexer selects one of the 4-bit channels and directs a 4-bit output. Such an application can be created by applying a set of changing binary signals to the multiplexer select inputs. For example, we could connect a simple counter to the select inputs.
