Simulink HDL Coder: What It Is and How It Works

Simulink HDL Coder is a tool that automatically converts Simulink models into hardware description language (HDL) code like VHDL or Verilog. This code can then be used to program hardware devices such as FPGAs or ASICs for digital circuit design.

How It Works

Imagine you have a detailed recipe (your Simulink model) for making a cake, but you need to tell a robot exactly how to bake it step-by-step. Simulink HDL Coder acts like a translator that takes your recipe and writes it in the robot's language (HDL code) so it can follow the instructions perfectly.

It analyzes your Simulink model, which is a graphical way to design systems using blocks and connections, and then generates HDL code that describes the same behavior in a form hardware devices understand. This process saves time and reduces errors compared to writing HDL code by hand.

Example

This example shows how to generate HDL code from a simple Simulink model that adds two signals.

matlab

model = 'simple_add';
new_system(model);
open_system(model);
add_block('simulink/Sources/In1', [model '/In1']);
add_block('simulink/Sources/In1', [model '/In2']);
add_block('simulink/Math Operations/Add', [model '/Add']);
add_block('simulink/Sinks/Out1', [model '/Out1']);

add_line(model, 'In1/1', 'Add/1');
add_line(model, 'In2/1', 'Add/2');
add_line(model, 'Add/1', 'Out1/1');

% Generate HDL code
makehdl([model '/Add']);

Output

HDL code generated for block 'simple_add/Add'. Files saved in the current folder.

When to Use

Use Simulink HDL Coder when you want to quickly turn your system designs into hardware implementations without manually writing HDL code. It is especially useful in industries like aerospace, automotive, and communications where hardware needs to be reliable and efficient.

For example, if you design a digital filter or a control system in Simulink and want to deploy it on an FPGA, HDL Coder automates the code generation, speeding up development and testing.

Key Points

• Automatically converts Simulink models to HDL code (VHDL/Verilog).
• Saves time and reduces manual coding errors.
• Supports hardware deployment on FPGAs and ASICs.
• Integrates with Simulink for seamless design flow.

Key Takeaways

Simulink HDL Coder generates hardware code automatically from Simulink models.

It helps deploy designs on hardware like FPGAs without manual HDL coding.

Ideal for digital system designers needing fast, reliable hardware implementation.

Supports VHDL and Verilog code generation for various hardware targets.