i.MX ProcessorsのトピックAbout i.MX8M Mini's USB usage

About i.MX8M Mini's USB usage

937556508 — Fri, 15 May 2020 02:09:20 GMT

Hi,

I want to design a USB circuit using i.MX8M Mini.The circuit scheme is that USB2 as OTG, USB1 as slave, can you give me some design reference or suggestion.

I experimented on the development board, USB2 OTG can be used normally, but I can't use the USB1 OTG as a slave(USB1 OTG as a host is OK).

Additionally, after I disabled USB2 port, USB1 OTG can be used normally. I don't know if USB1 can be used as a slave?

I am very troubled now, I hope to get your help as soon as possible.

Best wishes.

Re: About i.MX8M Mini's USB usage

weidong_sun — Fri, 15 May 2020 07:10:45 GMT

Hello Liu,

About I.MX8MM USB design, you can refer to the document.

https://community.nxp.com/docs/DOC-346008

Hope the document is hlepful to you.

Have a nice day!

B.R,

weidong

Re: About i.MX8M Mini's USB usage

937556508 — Fri, 15 May 2020 10:59:19 GMT

Hi weidong,

Thank you for your reference.

In my design, a USB is a TYPEC interface.

Now I think the OTG of this typeC interface will affect the use of another USB interface as a slave,

I am using the development version of 8MMINILPD4-EVK

Can you help me check FW what is the reason?

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I experimented on the development board, USB2 OTG can be used normally, but I can't use the USB1 OTG as a slave(USB1 OTG as a host is OK).

Additionally, after I disabled USB2 port, USB1 OTG can be used normally.

Re: About i.MX8M Mini's USB usage

weidong_sun — Mon, 18 May 2020 02:55:25 GMT

Hello Liu,

Let me discuss it in Chinese, if you can't understand Chinese, let me know, please!

1. USB1 / USB2 都可以配置OTG模式。但是，开发板上的设计，USB2供电，USB1用于下载。

2. 对于 usb serial download 配置时，USB1 / USB2 只能有一个工作在device模式，用于下载image。

所以，你的测试是对的。

Have a nice day!

B.R,

Weidong

Re: About i.MX8M Mini's USB usage

937556508 — Mon, 18 May 2020 05:34:17 GMT

您好 Weidong,

谢谢您的确认。

现在我的设计是用芯片MIMX8MM5DVTLZAA，搭载两个USB电路，USB port1作为device，USB port2作为OTG，

我的这个方案是不是不可行？请帮我确认一下。

祝好！

Re: About i.MX8M Mini's USB usage

weidong_sun — Tue, 19 May 2020 00:07:52 GMT

你的也是可行的！

一般我设计的时候是这样做的：

USB1做为OTG，既可以做device，也可以做HOST。

USB2做HOST。

伟东

Re: About i.MX8M Mini's USB usage

937556508 — Tue, 19 May 2020 01:59:52 GMT

您好，

现在我的方案是USB port1作为slave是定死的，无论usb serial download 配置，还是Internal Boot 。

在Internal Boot 完成后，CPU正常工作时，我担心在USB port2设定为OTG的情况下，USB port1作为slave是不能够被识别的（就和开发板的情况一样）。

祝好！

Re: About i.MX8M Mini's USB usage

937556508 — Mon, 19 Oct 2020 06:20:51 GMT

您好伟东，

我们之前设计的i.MX8M Mini搭载USB-type-c的板子已经造出来了，现在板子出现了USB无法识别的想象，非常希望能够得到您的帮助。

下图是我们的原理图（USB1_ID是NC的），及USB不识别的报告信息。

期待您的回复。

祝好！