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LS1021A - USB 3.0 Port will not enumerate at USB 2.0 High Speed

Question asked by Steve Merritt on May 16, 2018

Hello,

 

I'm currently looking at an issue with the LS1021a whereby the USB 3.0 port enumerates fine at both at SS & FS, but is not enumerating at HS.

 

Looking at the USB DP/DM pair with a scope, the LS1021A is not putting out a K-chirp during reset after the bus enumerates at FS.

 

Has anyone else encountered this problem?

 

Thanks and best regards,

Steve

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