How to force USB1 peripheral to only use full speed?

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How to force USB1 peripheral to only use full speed?

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cp1
Contributor III

I was wondering if there is a way to force the USB1 peripheral in device mode to only use full-speed operation.  I understand normally the host signals this, and the USB1 peripheral is capable of using full-speed or high-speed, but is there a way to force it to _only_ use full-speed even when the host is high-speed capable?

I noticed in the host controller peripheral, it has a field for setting the speed of USB1, but it doesn't work when the device controller is used.

I also understand there is a USB0 peripheral that is full-speed only, but is there a way to force the usb1 peripheral to be full-speed only too in device operation?

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ZhangJennie
NXP TechSupport
NXP TechSupport

Hi  Conor Patrick 

USB1 can only work in high speed. No way to force it work in full speed.

Have a nice day

Jun Zhang

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namsu_mun
Contributor III

Sorry for wrong reply....

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cp1
Contributor III

Hey Jun

Thanks for the quick reply.  Are you sure?  It says in the UM that there is "Low-speed (LS), Full-Speed (FS), and High-Speed (HS) support.", in "45.2 Features".  So it isn't just highspeed.

Conor

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