USB 2.0 OTG pheripherical is not respoding - USB 2.0 OTG pheripherical is not respoding I'm trying to use cyclone V as a device USB but I'm not being able - all the values that I read from this device are zero. On linux I have the following error: dwc2 ffb40000.usb: s3c_hsotg_corereset: reset failed, GRSTCTL=00000000 I've checked the resetmngr (I've also tried to reset it): # devmem 0xFFD05014 32 0x00000000 I've checked the clocks: # devmem 0xFFD040A0 32 0x00000FFF I've checked the clock divider # devmem 0xFFD040A4 32 0x00000920 And I have no idea why I can't read/write the USB controller device. I always read zero instead reading the Synopsys ID Register (0x4F54293A): # devmem 0xFFB40040 32 0x00000000 Any suggestions? Replies: Re: USB 2.0 OTG pheripherical is not respoding I just figure out. The was a problem with the clock to LPTI PHY - the controller should be stuck.