Flatten Hierachy for MATLAB functions used in SIMULINK when Generating HDL code

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Kamyar Khosravi 2018-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/420484-flatten-hierachy-for-matlab-functions-used-in-simulink-when-generating-hdl-code

编辑： Peyman K. Reghbati 2020-2-14

Hi, I am using few MATLAB functions in my SIMULINK model and then generate an HDL code (Verilog in particular) from it. The problem I am having is that it generates different Verilog files for each function and I can't find an option to flatten the hierarchy for the functions. Is it possible to flatten the hierarchy for the functions?

Many Thanks, Kamyar

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Answer 1

Yousef B Bedoustani 2018-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/420484-flatten-hierachy-for-matlab-functions-used-in-simulink-when-generating-hdl-code#answer_339992

编辑：Yousef B Bedoustani 2018-10-5

1. Right click on the subsystem

2. Chose HDL code\ HDL Block Properties

3. In General section: change FlattenHierarchy = on

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Kamyar Khosravi 2018-10-8

Hi Yousef,

Thank you for the reply. But my question was for MATLAB function and not the subsystem. Even when I put the function within the subsystem and flatten hierarchy as you mentioned, I still receive additional file for that function.

Peyman K. Reghbati 2020-2-14

编辑：Peyman K. Reghbati 2020-2-14

It is possible that you have the MATLAB function Synchronous in State Control of your function. See Below:

imitations For Hierarchy Flattening

A subsystem cannot be flattened if the subsystem is:

A Synchronous Subsystem or uses the State Control block in Synchronous mode.
A black box implementation or model reference.
A Triggered Subsystem when Use trigger signal as clock is enabled.
A masked subsystem that contains any of the following:
Bus.
Enumerated data type.
Lookup table blocks: 1-D Lookup Table, 2-D Lookup Table, Cosine HDL Optimized, Direct LookupTable (n-D), Prelookup, Sine HDL Optimized, n-D Lookup Table.
MATLAB System block.
Stateflow blocks: Chart, State Transition Table, Sequence Viewer.
Blocks with a pass-through or no-op implementation. See Pass through, No HDL, and Cascade Implementations.