New ContributorWe are trying to build a TDC in an Agilex 5 FPGA by using the carry chain. We are now struggling in getting the LUTs F0-F3 configured correctly.
Is it possible to use different equations for F0 and F1, respectively F2 and F3? If yes, how?
We tried using the tennm_lcell_comb element. But it does not seem to behave as in other (older) FPGAs.
Super ContributorHi,
Can you attached 2 design for me to investigate?
1) the older device that demonstrate it work.
2) the agilex 5 design.
Thanks,
Best regards,
Kenny Tan
New ContributorHi Kenny,
I added the designs to the supportrequest that was opened.
Super ContributorI added some information to your email as well, can you take a look and get back to us?
Super ContributorJust to let you know after the discussion, the old method of find the equation using ECO can still be done on the latest version of Quartus.
In Quartus Pro ECO is supported primarily only as a Tcl interface. There is some documentation on this here:
https://www.intel.com/content/www/us/en/docs/programmable/683873/current/an-922-using-the-eco-compilation-flow.html (AN 922, see also section 1.3.1) and here:
https://www.intel.com/content/www/us/en/docs/programmable/683641/24-3/using-the-eco-compilation-flow.html (Documentation in Quartus User Guide) and here:
https://www.intel.com/content/www/us/en/docs/programmable/683432/24-3/tcl_pkg_eco_ver_1-0_cmd_modify_lutmask.html (Tcl API documentation)
An easier way to get comfortable with this mechanism is to use the Fitter Toolkit, which is an executable shipped with recent versions of Quartus but only accessible via command-line.
The command to run Fitter Toolkit is quartus_ftk.
You can check your email for more detail information. Thanks
Super ContributorHave you try to compile using RTL design instead of WYSIWYG for your project? Then use the ECO method.
Since tennm_lcell_comb might not work exactly as in old legacy devices.
Regards,
Richard Tan
Super ContributorI just posted some soln internally, you may check your email on this. We will communicate this internally as this is not something usual that user will do. thanks
Super ContributorThis case will be discuss internally, as it require some feature testing and complication.
Super ContributorThis question has been addressed internally, I now transition this thread to community support. If you have a new question, Please login to ‘https://supporttickets.intel.com/s/?language=en_US’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.
