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

A10 DDR4 fails calibration

I have a DDR4 implemented in an Arria 10, and it is consistently failing calibration.When I run the EMIF debug tool, it indicates that the failure occurs during write de-skew. The failure occurs on ...
NurAida_A_Intel's avatar
NurAida_A_Intel
Icon for Frequent Contributor rankFrequent Contributor
5 years ago

Hi Sir,

You interface is 800MHz with one CS. By right, this speed do not need to turn on board deskew.

I am also curious about the debug results, which says that calibration failed on write deskew; does this mean that everything before write deskew (address/cmd leveling, address/cmd deskew, read deskew, etc.) passed?

Answer: Not necessary. Sometime, the previous calibration will create some flaw and cause current stage unable to calibration successful. And this time, I will suggest you to give this a try - https://www.intel.com/content/altera-www/global/en_us/index/support/support-resources/knowledge-base/solutions/fb292783.html

Try turn on both of the option as below:

Skip address/command leveling calibration

Skip address/command deskew calibration

Thanks

Regards,

Aida