String Constant

R2026b

Output specified string

• 

String Constant block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simulink / String

Description

The String Constant block outputs a string specified by the String parameter. Use this block when you want a constant whose type is string.

Limitations

The Output data type parameter does not support string data types that use symbolic expressions to specify the maximum length because signals with symbolic dimensions must be driven by a block with nonconstant sample time. For example, the Output data type parameter specified as stringtype("N") with N defined as a symbolic expression is not supported.

Ports

Output

Port_1 — Output string

scalar

Output string, specified as a scalar.

Data Types: string

Parameters

String — Input string

"Hello!" (default) | scalar

Input string, specified as a scalar. This string can be any MATLAB^® expression that represents a string. For more information on special characters, see char, ' '.

Programmatic Use

Block Parameter: String

Type: character vector

Values: '"Hello!"' | scalar

Default: '"Hello!"'

Output data type — Output data type

string (default) | <data type expression>

Output data type, specified using the string data type to specify a string with no maximum length.

To specify a string data type with a maximum length, specify stringtype(N). For example, stringtype(31) creates a string data type with a maximum length of 31 characters.

Click the Show data type assistant button to display the Data Type Assistant, which helps you set the data type attributes. See Specify Data Types Using Data Type Assistant for more information.

Programmatic Use

Block Parameter: OutDataTypeStr

Type: character vector

Values: 'string' | <data type expression>

Default: 'string'

Mode — Category of data

string (default) | scalar

Use the stringtype function, for example, stringtype(31).

Dependency

Clicking the Show data type assistant button enables this parameter.

Block Characteristics

Data Types	string
Direct Feedthrough	no
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"simulink/String/String Constant"

Example: add_block("simulink/String/String Constant","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog 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 one default HDL architecture.

HDL Block Properties

ConstrainedOutputPipeline	Number of registers to place at the outputs by moving existing delays in the design. Distributed pipelining does not redistribute these registers. The default value is 0. For more details, see ConstrainedOutputPipeline (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 value is 0. For more details, see OutputPipeline (HDL Coder).
SynthesisAttributes	Specifies the synthesis attributes for the blocks and block output signals in the model. The generated HDL code contains these attributes. For more information, see SynthesisAttributes (HDL Coder).

Version History

Introduced in R2018a

R2026a: Specify synthesis attributes for blocks and block output signals

Use the SynthesisAttributes HDL block property to specify the synthesis attributes for the block and its output signals. HDL Coder includes these attributes in the generated HDL code.