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Sajith_K_Intel's avatar
Sajith_K_Intel
Icon for New Contributor rankNew Contributor
6 years ago
Solved

How do we set a "keep" or "preserve" attribute to a wire, from QSF or without modifying the code?

How do we set a "keep" or preserve attribute to a wire in my design, from QSF without modifying the code? Quartus 19.4 have PRESERVE_REGISTER setting, but for registers. What I would like to place ...
  • KhaiChein_Y_Intel's avatar
    KhaiChein_Y_Intel
    6 years ago

    Hi,

    Yes. The attribute preserve is supported through HDL only.

    Thanks.

    Best regards,

    KhaiY

sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
6 years ago

Unfortunately, I don't think this is possible without using a synthesis attribute in the code. However, have you tried preserving the registers before or after the logic where you're seeing the name changes?

And if you don't want the packing and merging you mention to occur at all, look at some of the logic options/assignments that start with "Auto" that might prevent the changes from happening.

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