Forum Discussion
Occasional ContributorDDR4 EMIF VREF pins, Arria 10
Hi Ju-Ti,
"Question 1: could this non-zero VREF voltage have effect on calibration?"
- It's may and may not affect calibration process since it's supply to voltage source not to GND. As you can see, the calibration can pass after changing some parameters.
- But it's better to follow the guideline to avoid any conflict in the functionality.
"Question 2: Is it possible that Address/Command phase of calibration is disturbed due to this, and causes later rd/wr data deskewing to fail? "
- It's may not affect the calibration process because I think the alert_n is not used during the calibration.
- Besides, the alert_n signal has been terminated.
- I would say that this might not be the root cause but you can follow the recommendation for the new board.
Regards,
Adzim
Regular ContributorHi,
We sincerely apologize for the inconvenience caused by the delay in addressing your Forum queries. Due to an unexpected back-end issue in our system, your Forum case, did not reach us as intended. As a result, we have a backlog of cases that we are currently working through.
Please be assured that we are doing everything we can to resolve this as quickly as possible. This will take some time, and we appreciate your patience and understanding during this period of time. Thank you again for your patience and understanding, and we are committed to provide you with the best possible support.
I saw that you have resolved your issue.
Do you still need help on this forum?
Regards,
Adzim
