Hardware design checklist for i.mx6q/i.mx6dl

[jimmyli]

     Now, we meet with the imx6q/imx6dl application question showed below.

     QS: Every finished product needs to be ddr calibrated. If not, many products will boot failed or crash when play video continuously. We checked from software fist, but haven't found the potential reason. Now, we plan to check the hardware design.

     Help: Is that any advise or technical document (checklist, etc.) to support us.

     Thanks a lot.

     Note: Our products contains imx6q or imx6dl.

[jan_spurek]

Hello Jimmy,

the DDR calibration procedures compensate for the time skews between data, their strobes and clock/command/address signals caused by length mismatches etc. The board manufacturing process has a finite precision and therefore all of its dimensions and parameters (dielectric constant,...) will have a certain variation around the optimal value. If the variation is too great, the calibration values for one board may not be applicable to another.

Best Regards,

Jan

[jimmyli]

Hi Jan,

     Thanks for your suggestion.

     That's important for me to develop the i.MX6.

[gusarambula]

Hello Jimmy Li,

There is a Hardware Development Guide that should be of help (link below). Chapter 2 provides a checklist.

https://www.nxp.com/docs/en/user-guide/IMX6DQ6SDLHDG.pdf

There is also an application note regarding DDR calibration (AN4467 link below) that may help as long as the routing constraints listed on  the development guide are followed.

https://www.nxp.com/docs/en/application-note/AN4467.pdf

I hope this helps!

Regards,

[jimmyli]

Hi Gusarabula,

     Thanks.

     That's valuable for me.