i.MX 6DQ USB Chirp

[sugiyamatoshihi]

Hi, 

I have a question about chirp timing of USB Host connection. 

I think chirp timing like a below.  

I think output timing of HUB K-J Chirp pairs after detecting Device K Chirp controlled by HW  because it must be less than 100uS. 

Is this correct that HW control timing after Device K Chirp?

Best Regards,

Sugiyama

[CarlosCasillas]

Hi,

You could refer to “i.MX6/7 Series USB Certification Guide” document regarding this kind of USB specifications of i.MX6 and i.MX7 processors. This document is available at the following link:

http://www.nxp.com/assets/documents/data/en/user-guides/IMXUSBCGUG.pdf

Hope this will be useful for you.
Best regards!
/Carlos
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[sugiyamatoshihi]

Hi, Carlos,

Thank you for information.

The issue was Hub K-J chirp doesn't start immediately after device K chirp.  However, it was resolved after device move to another board. It sees it was board issue.

Thanks,

Sugiyama