Forum Discussion

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,


As I understand it, constraining to the highest frequency does NOT guarantee that all lower data rate will work properly. It is recommended for you to use the previous clock group assignment to constrain for different frequencies.


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,

alright I will create a constraint for highest and lowest frequency.

Is there any recommended constraint to use? Should I use create_clock on a specific port of the E-Tile native or can I use create_generated_clock?

I already tried it with the create_clock with the specific output clocks of the E-Tile native but this statement won't be recognised. The port name is not available in the technology map.

Could you help me which port I should constraint here?

Kind regards,

Michael