How can I keep instance during synthesis stage

[Michaelyu]

Hi,

My source code is a vqm file which generated by Synplify, and using Quartus Pro 21.1 to do place and route.

I found that some buffers would be optimized by Quartus, and these buffers are not registers.

What could I do if I would like to keep these buffers during fitter stage in Quartus?

Thanks for any suggestions.

[SyafieqS]

Po,

You may look at the synthesis Quartus attributes as link below

https://www.intel.com/content/www/us/en/programmable/quartushelp/17.0/hdl/vhdl/vhdl_file_dir.htm

Keep and norprune attribute can prevent from being removed.

[SyafieqS]

Hi Yu,

May I know if there is any update on this?

[Michaelyu]

Hi SyafieqS,

I modified the vqm file manually and used (* keep *) attribute to prevent my buffer from being removed.

Thank you so much for your helping.

[SyafieqS]

I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.