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USB device on Spartan6 evaluation board

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alphus

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Hi all,

I'm working to implement USB2.0 device on Spartan-6 LX150T development kit. I use on-board PHY (NXP ISP1504A1) with ULPI interface.
I also use a USB logic analyser (FS only).

In HS, device working stable and is always recognized on host. In full-speed work is unstable, device is often not recognized.
When device is in FS, host begins exchange (get_descriptor request,it is succesfull) and i see USB reset on bus (using analyser). After reset all repeats.

Why USB_reset occurs in FS?
 

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