topic Re: imx8mp PCIe compliance test failed in i.MX Processors

imx8mp PCIe compliance test failed

kei_odagiri — Fri, 08 Oct 2021 06:22:35 GMT

Hi,

We are undertaking PCIe compliance test for our custom board with i.MX8M Plus. But a couple of test aren't passed yet. I attach a result of the compliance test. It seems the quality of TX signal wave doesn't conform the compliance test. We considered we should correct the drive strength of the signal, and we tried changing some registers in imx8mp, but we couldn't change the amplitude of the signal.

Would you tell us about the register of imx8mp to change the drive strength of PCIe TX signal?

Best regards,

Kei Odagiri

Re: imx8mp PCIe compliance test failed

Yuri — Tue, 19 Oct 2021 03:16:59 GMT

@kei_odagiri
Hello,

Have You used recommendations of app note AN12444
(PCIe Certification Guide for i.MX8 Series) ?

In particular, section 2.3 (Test environment).

https://www.nxp.com/docs/en/application-note/AN12444.pdf

Regards,
Yuri.

Re: imx8mp PCIe compliance test failed

kei_odagiri — Tue, 19 Oct 2021 04:15:47 GMT

Hello,

We have referred to the guide and checked the instruction also section 2.3. I believe it had been done properly. We had accessed the following register, but it didn't work.

Best regards,

Kei Odagiri

Re: imx8mp PCIe compliance test failed

kei_odagiri — Tue, 19 Oct 2021 04:19:50 GMT

Sorry, I missed to write this.

Kei Odagiri

Re: imx8mp PCIe compliance test failed

Yuri — Thu, 28 Oct 2021 10:46:47 GMT

@kei_odagiri
Hello,

Please check if the board follow the Table 8 (PCIe recommendations)
and Table 24 (Trace impedance recommendations) of Hardware Development
Guide for the i.MX8MP.

< https://www.nxp.com/webapp/Download?colCode=IMX8MPHDG >

Regards,
Yuri.

Re: imx8mp PCIe compliance test failed

kei_odagiri — Mon, 09 May 2022 00:20:27 GMT

This topic is too old. So, we can close this ticket.