Mux

Combine input signals of same data type and complexity into virtual vector

• Library:

• Simulink / Commonly Used Blocks

  Simulink / Signal Routing

  HDL Coder / Commonly Used Blocks

  HDL Coder / Signal Routing

• 

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Description

The Mux block combines inputs with the same data type and complexity into a vector output. The output mux signal is flat, even if you create the mux signal from other mux signals. However, you can use multiple Mux blocks to create a mux signal in stages.

A mux signal simplifies the visual appearance of a model by combining two or more signal lines into one line. Mux signals do not affect simulation or code generation.

Tip

If inputs have different data types or complexity, use a virtual bus to visually group the signals. For more information, see Types of Composite Signals.

Ports

Input

Port_1 — Input signal to include in mux signal

scalar | vector

Input signal to include in the mux signal, specified as a scalar or vector.

The input signals for a Mux block can be any combination of scalars and vectors, but they must have the same data type and complexity.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated
Complex Number Support: Yes

Output

Port_1 — Output mux signal

vector

Output mux signal composed of the combined input signals, returned as a vector.

The elements of the output mux signal take their order from the port order of the input signals. For a description of the port order for various block orientations, see Port Location After Rotating or Flipping.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated

Parameters

Number of inputs — Number of input signals

2 (default) | scalar | vector | cell array | comma-separated list of signal names

The number of input signals, specified as a scalar, vector, cell array, or comma-separated list of signal names. Some of these formats allow you to specify the signal names and sizes, as described by the following table.

Format	Block Behavior
Scalar	The number of inputs to the Mux block. When you use this format, the block accepts scalar or vector signals of any size. Simulink® assigns each input the name signalN, where N is the input port number.
Vector	The length of the vector specifies the number of inputs. Each element specifies the size of the corresponding input. A positive value specifies that the corresponding port can accept only vectors of that size. For example, [2 3] specifies two input ports of sizes 2 and 3, respectively. If an input signal width does not match the expected width, an error message appears. A value of -1 specifies that the corresponding port can accept scalars or vectors of any size.
Cell array	The length of the cell array specifies the number of inputs. The value of each cell specifies the size of the corresponding input. A scalar value N specifies a vector of size N. A value of -1 means that the corresponding port can accept scalar or vector signals of any size.
Comma-separated list of signal names	A list of signal names separated by commas. Simulink assigns each name to the corresponding port and signal. For example, if you enter position,velocity, the Mux block has two inputs, named position and velocity.

Tip

If you specify a scalar for the Number of inputs parameter and all of the input ports are connected, as you draw a new signal line close to input side of a Mux block, Simulink adds a port and updates the parameter.

Programmatic Use

Block Parameter: Inputs

Type: scalar, vector, cell array, comma-separated list of signal names

Values: integer, vector of port sizes, cell array, comma-separated list of signal names

Default: {'2'}

Display option — Block icon appearance

bar (default) | signal | none

Block icon appearance, specified as bar, signal, or none.

• bar — Displays no text

• signal — Displays the input signal names

• none — Displays the type of block (Mux)

Resize the block as necessary to fit the text on the block icon.

Programmatic Use

Block Parameter: DisplayOption

Type: character vector

Values: 'bar' 'signals' 'none''bar'

Default: 'bar'

Model Examples

Create Mux Signal and Extract Elements

Create a mux signal and extract elements from the mux signal.

Open Model

Automotive Suspension

Model a simplified half-car model that includes an independent front and rear vertical suspension. The model also includes body pitch and bounce degrees of freedom. The example provides a description of the model to show how simulation can be used to investigate ride characteristics. You can use this model in conjunction with a powertrain simulation to investigate longitudinal shuffle resulting from changes in throttle setting.

Open Model

Block Characteristics

Data Types	Boolean | double | enumerated | fixed point | integer | single
Direct Feedthrough	yes
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Actual data type or capability support depends on block implementation.

HDL Code Generation

Generate Verilog and VHDL code for FPGA and ASIC designs using HDL Coder™.

HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.

HDL Architecture

This block has a single, default HDL architecture.

HDL Block Properties

ConstrainedOutputPipeline	Number of registers to place at the outputs by moving existing delays within your design. Distributed pipelining does not redistribute these registers. The default is 0. For more details, see ConstrainedOutputPipeline (HDL Coder).
InputPipeline	Number of input pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default is 0. For more details, see InputPipeline (HDL Coder).
OutputPipeline	Number of output pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default is 0. For more details, see OutputPipeline (HDL Coder).

Complex Data Support

This block supports code generation for complex signals.

Restrictions

Buses are not supported for HDL code generation.

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.

Fixed-Point Conversion

Design and simulate fixed-point systems using Fixed-Point Designer™.

Actual data type or capability support depends on block implementation.