User-Defined MATLAB Functions

Create HDL-ready algorithms using blocks in User-Defined Functions library

The HDL Coder block library contains many blocks that you can add to your develop your Simulink^® modeling environment and develop your HDL algorithm. You can also integrate your HDL algorithm that contains MATLAB^® code in the Simulink environment by using the MATLAB Function and MATLAB System blocks in the User-Defined Functions library.

To filter the Simulink Library Browser to show only HDL-supported blocks, enter hdllib.

Functions

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System Objects

`hdl.RAM`	Single, simple dual, dual, true dual, or simple tri-port RAM for memory read/write access
`hdl.BlackBox`	Black box for including custom HDL code

Supported Block Library

hdllib Display blocks that are compatible with HDL code generation

HDL Optimized Arithmetic Operations

`hdl.treesum`	Sum of array elements using tree architecture (Since R2022a)
`hdl.treeprod`	Product of array elements using tree architecture (Since R2022a)

Checks

Check for MATLAB Function block settings

Topics

Modeling MATLAB Functions

MATLAB Function Block Design Patterns for HDL
Hardware design patterns that use advanced MATLAB Function block features for HDL code generation.
Create Hardware Design Patterns Using the MATLAB Function Block For HDL Code Generation
Use the HDL design patterns library em_hdl_design_patterns to implement patterns that use the MATLAB Function block to solve common hardware modeling problems.
Design Guidelines for the MATLAB Function Block
Recommended option settings and procedures for MATLAB Function blocks for optimal HDL code generation.
HDL Applications for the MATLAB Function Block
The MATLAB Function block and its application in HDL code generation.

Generate HDL Code from MATLAB Functions

Generate HDL Code from a MATLAB Function Block
Learn how to incorporate a MATLAB Function block in your model and generate HDL code.
Generate Instantiable Code for Functions
Generate Verilog^® module or VHDL^® entity in HDL code for functions.
Bitwise Operations in MATLAB for HDL and HLS Code Generation
HDL Coder™ supports bit shift, bit rotate, bit slice operations that mimic HDL-specific operators without saturation and rounding logic.

Related Information

Hardware Modeling with MATLAB Code

Troubleshooting

Initialize Persistent Variables in MATLAB Functions

Specialized semantics impact the way that a function initializes persistent data.

Featured Examples

CORDIC Algorithm Using the MATLAB Function Block

Use HDL Coder™ to check, generate and verify HDL for a fixed-point CORDIC model implementing sin and cos trigonometric functions using the MATLAB Function Block.

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System Design with HDL Code Generation from MATLAB and Simulink

Generate a MATLAB Function block from a MATLAB® design for system simulation, code generation, and FPGA programming in Simulink®.

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HDL Code Generation for Streaming Matrix Multiply System Object

How HDL Coder™ implements a streaming mode of matrix multiplication with configurable sizes.

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HDL Code Generation for Streaming Matrix Inverse System Object

How HDL Coder™ implements a streaming mode of matrix inverse operation with configurable sizes.

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