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remov_b4_flight's avatar
remov_b4_flight
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4 months ago

Fitter failed with "Unknown DQ mode"

QuartusII 13.1 Windows 64 bit In the middle of Compile design, Fitter aborted with these signals, 100% Internal Error: Sub-system: FSAC, File: /quartus/fitter/fsac/fsac_titan_dqs_legality.cpp, Lin...
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RichardT_altera's avatar
RichardT_altera
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4 months ago

I am not able to find a similar internal error in the database.


May I know which device you are using? Is it possible to upgrade the design to the latest Quartus version that supports your device? There is a chance that the internal error might have been fixed in a later Quartus release.


Quartus® Software Latest Version for Device Support:

https://www.intel.com/content/www/us/en/support/programmable/support-resources/design-software/devices-support.html


If upgrading the design is not possible, please kindly share your design by archiving the project (Project > Archive Project) so that I can attempt to reproduce the error on our side.


FYI: For all cases involving Fatal Errors or Internal Errors, we need a design test case to reproduce the issue. Without being able to duplicate the error on our end, it becomes difficult to identify a workaround or solution.


Regards,

Richard Tan





  • remov_b4_flight's avatar
    remov_b4_flight
    Icon for New Contributor rankNew Contributor
    4 months ago

    Hi all.

    Project uses Stratix III device,13.1 is last version of Stratix III support.

    I compared settings in Assignment editor with example project that generated by MegaCore wizard,

    I found wrong settings with DQ_GROUP (mem_dqs[*] -> mem_dq).

    Thank you.