topic Re: iMX6D DDR Calibration problems in i.MX Processors

iMX6D DDR Calibration problems

devil0618 — Wed, 10 Jan 2018 11:52:49 GMT

Hello,

Greeting.

I have developed a customed IM6 Dual board with 2GB DRAM(4 pieces MT41K256M16TW-107IT:P DDR3 chips by Micron).After configurating the DDR parameter,we tried DDR Stress test using DDR Stress test Tool V1.03 .The configuration progress stucked after starting DQS gating calibration,and the calibration didn't go any further.And it didn't report any "ERROR ".We also tried connecting the board with PC using a USB cabel ，the “MsgTools” can find a device,but can't load the Uboot. We had reviewed the hardware design by "Check List".

Does anyone have any idea what I could be doing wrong or give me some suggestion? Thanks in advance for any help.

Re: iMX6D DDR Calibration problems

igorpadykov — Wed, 10 Jan 2018 23:07:51 GMT

Hi 许

please look at suggestions ptovided on similar issue in

DDR3 configuration for imx6q processor

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: iMX6D DDR Calibration problems

devil0618 — Fri, 12 Jan 2018 05:48:40 GMT

Hi igorpadykov

Thank you for your advice.I have re-check my schematic files.I find THE "USB_H1_VBUS" pin is left unconnected. And the voltage of pin "VDDUSB_CAP" is just 1.5V. We havn't use the "USB Host " function.The "USB_H1_DP" pin and "USB_H1_DN"pin are also left unconnected. Do u think it's relevant to my problem.

Thanks again.

Best regards

Xu Lei

Re: iMX6D DDR Calibration problems

igorpadykov — Fri, 12 Jan 2018 05:58:14 GMT

Hi Xu

yes if voltage of pin "VDDUSB_CAP" is just 1.5V then it may cause that
MfgTool can't load the Uboot.

Best regards
igor

Re: iMX6D DDR Calibration problems

devil0618 — Fri, 12 Jan 2018 06:06:03 GMT

Hi igorpadykov

But does the pin "USB_H1_VBUS" must be connected to a 5V voltage even we don't use the "USB Host " function?

Best regards

Xu Lei

Re: iMX6D DDR Calibration problems

igorpadykov — Fri, 12 Jan 2018 07:32:36 GMT

USB_H_VBUS or USB_OTG_VBUS should be powered for having

correct VDD_VBUS_CAP, according to Figure 50-1. Power system overview i.MX6DQ RM

http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf

Best regards
igor

Re: iMX6D DDR Calibration problems

devil0618 — Sat, 13 Jan 2018 06:37:10 GMT

Oh my.What can i do to save this board? Is there any other way to load the uboot fils into the IMX6 processor，like JTag.Can u give me some advice.

Thanks again for your enduring reply.

Best regards

Xu Lei

Re: iMX6D DDR Calibration problems

igorpadykov — Mon, 15 Jan 2018 06:13:20 GMT

yes it is possible to load the uboot with jtag, please check AN5229

https://www.nxp.com/docs/en/application-note/AN5229.pdf

Best regards
igor

Re: iMX6D DDR Calibration problems

devil0618 — Mon, 22 Jan 2018 04:05:54 GMT

Problem solved。It was the PCB soldering issue.Thanks anyway.