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Share Multipliers

Share multipliers with the resource sharing optimization

Model Configuration Pane: Optimization / Resource sharing


Enable this parameter to share multipliers with the resource sharing optimization. Resource sharing identifies Product or Gain blocks in your design that have two inputs and replaces them with a single Product or Gain block. This optimization saves area on the target FPGA device. Share multipliers with the resource sharing optimization.


  • To share multipliers in your design, in the HDL Block Properties for the DUT Subsystem, specify the SharingFactor.

  • When you specify the Multiplier sharing minimum bitwidth, the code generator shares multipliers that have a bit width greater than or equal to the minimum bit width. The default minimum bit width for sharing multipliers is zero.


On (default) | Off

When resource sharing is enabled, share multipliers with a bit width greater than or equal to the Multiplier sharing minimum bitwidth. For successfully sharing multipliers, the input fixed-point data types must have the same wordlength. The fraction lengths and signs of the fixed-point data types can be different.


Do not share multipliers.


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

For example, you can use the ShareMultipliers setting when you generate HDL code for the symmetric_fir subsystem inside the sfir_fixed model using either of these methods.

  • Pass the property as an argument to the makehdl function.

    makehdl('sfir_fixed/symmetric_fir', ... 
  • When you use hdlset_param, you can set the parameter on the model and then generate HDL code using makehdl.


Recommended Settings

No recommendations.

Programmatic Use

Parameter: ShareMultipliers
Type: character vector
Value: 'on' | 'off'
Default: 'on'

Version History

Introduced in R2015a