iMX8 uSDHC SD3.0 tuning

mileswang — Fri, 31 Aug 2018 01:27:45 GMT

Dear sir,

I'm confused about the SD3.0 tuning.

In iMX8RM, there is a register "uSDHCx_TUNING_CTRL", bit 24 - STD_TUNING_EN. If the bit is set, standard tuning circuit and procedure enable. I want to know what is "standard tuning", how to do standard tuning. There should be "non-standard tuning", how to do "non-standard tuning"?

In register "uSDHCx_MIX_CTRL", bit 24 - AUTO_TUNE_EN; bit 22 - EXE_TUNE. How to do auto-tune? and how to do manual-tune? Do auto-tune have relation with "standard tuning" or "non-standard tuning".

By my understanding, there should be 4 possibility:

1. standard tuning by auto-tune;

2. standard tuning by manual-tune;

3. non-standard tuning by auto-tune;

4. non-standard tuning by manual-tune.

Is it correct? I really don't know how to do tuning. I need a note to describe how to do it.

Thanks,

Miles

Re: iMX8 uSDHC SD3.0 tuning

Yuri — Wed, 05 Sep 2018 08:30:12 GMT

Hello,

Look at the following discussion, where some details of different tuning procedure are

shown:

https://community.nxp.com/message/1025457?commentID=1025457#comment-1025457

iMX7D SDIO tuning debugging

Have a great day,

Yuri

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topic Re: iMX8 uSDHC SD3.0 tuning in i.MX Processors

iMX8 uSDHC SD3.0 tuning

Re: iMX8 uSDHC SD3.0 tuning