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MichaelB's avatar
MichaelB
Icon for Occasional Contributor rankOccasional Contributor
5 years ago
Solved

E-Tile frequency constraints

Hi, I've a question regarding the E-Tile transceiver and their constraints. I would like to implement different data rates which I have already tested successfully using the reconfiguration int...
  • CheepinC_altera's avatar
    CheepinC_altera
    5 years ago

    Hi,


    If you observe issue trying to constrain the output clock ie cannot find in tech map, would you mind to help opening a new Forum case and let me know the case. I will help to route to our timing team to better assistance. Thank you.


CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi,


Thanks for sharing your SDC constraint. It seems like you are target relatively high precision which I am not sure if TimeQuest will be able to recognize. I have had some discussion with Kenny, probably you can try to set something like "Create_clock 10ps... " to see if it works. Adding the "ps" suffix.


If it is not working, you might need to stick to the default "ns" time scale. Sorry for the inconvenience.


Please let me know if there is any concern. Thank you.


MichaelB's avatar
MichaelB
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

Hi CheePin,

alright I will do it another way. I will define the maximum data rate to get the highest frequency generated by Quartus in its E-Tile constraint files.

I can switch the data rate by PMA configuration which I've already tested & verified for my design.

Can I be sure that all lower data rates are working properly without defining a minimum frequency for the lowest data rate?

Best regards,

Michael