alphus
Newbie level 6
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?
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?