USB_ECM_OP
ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_ECM_OP);
ocp_write_byte(tp, MCU_TYPE_USB, USB_ECM_OP, ocp_data);
ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_ECM_OP);
ocp_write_byte(tp, MCU_TYPE_USB, USB_ECM_OP, ocp_data);