Allow design delay distribution - Whether to allow distributed pipelining and delay absorption optimizations to move

                    design delays - MATLAB ([original](https://www.mathworks.com/help/hdlcoder/ref/allowdesigndelaydistribution.html)) ([raw](?raw))

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Main Content

Whether to allow distributed pipelining and delay absorption optimizations to move design delays

Renamed from Preserve design delays in R2023b

Model Configuration Pane: Optimization / Pipelining

Description

The Allow design delay distribution parameter specifies whether to allow distributed pipelining and delay absorption optimizations to move design delays in your model.

Settings

On (default) | Off

On

Allow distributed pipelining and delay absorption to move or absorb design delays in the model.

Off

Prevent distributed pipelining and delay absorption from moving or absorbing design delays in the model.

Tips

To set this property, use the functions hdlset_param or makehdl. To view the property value, use the function hdlget_param.

For example, suppose you have a model named sfir_fixed that contains a subsystem named symmetric_fir. To enable this parameter programmatically, use one of these methods:

• Pass the property as an argument to themakehdl function.
  makehdl('sfir_fixed/symmetric_fir', ...
  'AllowDelayDistribution','off')
• Use hdlset_param to disable the parameter on the model and then generate HDL code usingmakehdl.
  hdlset_param('sfir_fixed','AllowDelayDistribution','off')
  makehdl('sfir_fixed/symmetric_fir')

Recommended Settings

No recommendations.

Programmatic Use

Version History

Introduced in R2014a

expand all

The Preserve design delays parameter, which you programmatically set usingPreserveDesignDelays, is nowAllow design delay distribution.

In R2023a and earlier, the default for Preserve design delays was off. From R2023b, the default for Allow design delay distribution ison.

Previously, this parameter only affected distributed pipelining. In R2023b, this parameter controls both distributed pipelining and delay absorption.

If you set Preserve design delays toon in a model created in R2023a or earlier, HDL Coder™ prevented distributed pipelining from moving design delays. If you set Preserve design delays to off, the parameter is nowon and also prevents delay absorption.