Methods of preparing a power saving state, universal serial bus device and universal serial bus host

摘要

Methods of preparing a power saving state, a Universal Serial Bus (USB) device and a USB host are provided. A method of preparing a power saving state comprises sending a request from a USB device to a USB host, the USB host being connected to the USB device via a USB and the request requesting that the USB host shall stop any bus traffic on the USB. Another method of preparing a power saving state comprises receiving, at a USB host, a request from a USB device, the USB device being connected to the USB host via a USB and the request requesting that the USB host shall stop any bus traffic on the USB. A USB device and a USB host are configured to carry out the respective methods.