UHCI_FRNUM
currentFrame = ReadReg16(UHCI_FRNUM);
transfer->free_after_frame = ReadReg16(UHCI_FRNUM);
uint16 frameNumber = ReadReg16(UHCI_FRNUM);
uint16 currentFrame = ReadReg16(UHCI_FRNUM);
if (currentFrame == ReadReg16(UHCI_FRNUM))
WriteReg16(UHCI_FRNUM, 0);
ReadReg16(UHCI_USBSTS), ReadReg16(UHCI_FRNUM));