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ali_flt
Contributor
Contributor
323 Views
Registered: ‎08-10-2020

Do Vivado implementation options overwrite Vitis HLS export options?

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 Hi,

I've noticed that there are several options for config_export in vitis hls such as -vivado_optimization_level and -vivado_phys_opt and their default value is set to 0 and none. 
So I wanted to know if these default values mean that when this IP Core is used in a vivado project, which of this cases is true: 1. The IP Core is not optimized at all during implementation or 2. when the phys_opt_design option is set in vivado project, this option overwrites the HLS IP Core export parameters and actually does the place and route optimizations.

Many Thanks,
Ali

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dsakjl
Explorer
Explorer
226 Views
Registered: ‎07-20-2018

Hi @ali_flt ,

yes. They influence the commands:

export_design -flow syn

export_design -flow impl

You can check the documentation Vitis HLS ug1399 in section export_design.

Regards.

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dsakjl
Explorer
Explorer
272 Views
Registered: ‎07-20-2018

Hi @ali_flt ,

those options are independent from the usage of the IP in a Vivado project.

They are needed when you want a more accurate information about clock and resource usage, so that the tool uses vivado to synthesize and implement the IP to give you more accurate info.

Regards.

ali_flt
Contributor
Contributor
250 Views
Registered: ‎08-10-2020

Hey @dsakjl ,
Thanks for your reply. So If I understood your answer correctly, these hls export options are just for reporting purposes and do not affect the implementation results?

 

Regards 

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dsakjl
Explorer
Explorer
227 Views
Registered: ‎07-20-2018

Hi @ali_flt ,

yes. They influence the commands:

export_design -flow syn

export_design -flow impl

You can check the documentation Vitis HLS ug1399 in section export_design.

Regards.

View solution in original post

dsakjl
Explorer
Explorer
162 Views
Registered: ‎07-20-2018

Hi @ali_flt ,

if the previous post solved your problem, please, mark it as solution to permit others to reach it.

Regards.

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