topic Re: Question, i.MX8M Quad Lite clock inputs in i.MX Processors

Question, i.MX8M Quad Lite clock inputs

SLICE — Mon, 22 Oct 2018 06:33:48 GMT

Dear team,

I would like to ask about the clock inputs to i.MX8M QL.

All of 25MHz, 27MHz and 32.768KHz input are required for i.MX8M?

The customer will not use HDMI, and they want to remove the 27MHz. And they want to use divided clock from 25MHz for 32.768kHz if accuracy is not needed.

Regards,

Miyamoto

Re: Question, i.MX8M Quad Lite clock inputs

igorpadykov — Mon, 22 Oct 2018 10:18:27 GMT

Hi Miyamoto

>The customer will not use HDMI, and they want to remove the 27MHz.

it is ok, as for clocks 25MHz and 32.768KHz they are required for i.MX8M, please also check

Boot without external RTC

Best regards
igor
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Re: Question, i.MX8M Quad Lite clock inputs

SLICE — Tue, 23 Oct 2018 01:58:34 GMT

Hello Igor,

Thanks for your support.

https://community.nxp.com/message/1010000?commentID=1010000#comment-1010000?q=i.MX8M%20clock%20input

And HDMI_REFCLK_P/N can be left open when HDMI is not used.

And 27M crystal cannot be removed even if user does not use HDMI.

Correct?

Regards,

Miyamoto

Re: Question, i.MX8M Quad Lite clock inputs

igorpadykov — Tue, 23 Oct 2018 06:55:20 GMT

Hi Miyamoto

HDMI_REFCLK_P/N can be left open when HDMI is not used according to

Table 30 – i.MX8M Unused Signal Strapping Recommendations i.MX8M User Guide

Best regards
igor

Re: Question, i.MX8M Quad Lite clock inputs

SLICE — Thu, 25 Oct 2018 07:07:36 GMT

Hi igorpadykov‌

Thanks a lot!

As for the each of clocks, are there any requirement such like deviation or jitter?

Regards,

Miyamoto

Re: Question, i.MX8M Quad Lite clock inputs

igorpadykov — Thu, 25 Oct 2018 07:14:42 GMT

Hi Miyamoto

for clock requirements please check i.MX8M Hardware Developer’s Guide
https://www.nxp.com/docs/en/user-guide/IMX8MDQLQHDG.pdf

Best regards
igor