New ContributorI have problems, with a Arria V-Quartus 18/18.1 and time quest constraints. It seems quartus does not apply the constraints file. The same Project Works properly with a cyclone III and Q13.1.
Regular ContributorHi JOter,
What are the error messages? Could you elaborate?
Thanks
Regular Contributor
New ContributorThere are not errors. The problema is that the signal are delayed as spected.
The signal re: RAM_CLK (CLK) and OUTPUT 0 (counter)
We tested both signal in one scope, and we didn't notice any change between them changing the OUTPUT_DELAY constraints.
Remenber we checked it also using a C III, and in this case we got the spected signal.
We used the next constrains commands:
set_output_delay -clock vt_RAM_CLK -max [expr $RAM_tsetup + $RAM_BDb_max - $RAM_CLK_DLY_MIN] [get_ports {OUTPUT[0]}]
set_output_delay -clock vt_RAM_CLK -min [expr -$RAM_thold + $RAM_BDb_min - $RAM_CLK_DLY_MAX] [get_ports {OUTPUT[0]}]
And
set_output_delay -clock RAM_CLK -max [expr $RAM_tsetup + $RAM_BDb_max - $RAM_CLK_DLY_MIN] [get_ports {OUTPUT[0]}]
set_output_delay -clock RAM_CLK -min [expr -$RAM_thold + $RAM_BDb_min - $RAM_CLK_DLY_MAX] [get_ports {OUTPUT[0]}]
Best regards
Regular ContributorHi,
Can you check if the constraints are being ignored under 'Ignored Constraints'? Can you provide the timing report for both design?
Thanks.
New ContributorHi,
I send you both projects, so you can obtain all information.
Regards
New ContributorNew ContributorRegular ContributorHi JOter,
I checked the AV_OUTPUT_DELAY_TEST using Timing Analyzer, the output delay is as what we set in the .sdc file.
max 3ns and min 2ns.
Thanks.
New ContributorHi,
Thanks for your answer.
The problem is when we checks the ouput signal whith one oscilloscope, the output delay between both signals doesn't change using differents
Best regards
Regular ContributorHi,
Do you mean that the result in Timing Analyzer is different from the hardware result?
Thanks
New ContributorHi,
Yes, the results seems to be the same independently of the constrains assignement.
Best regards
