Abstract: In the case of a universal serial bus (USB) connection, a host detects a connection of a peripheral to the host via a USB interface of the host. The host then generates an informative command, which includes information on capabilities of the host. This informative command is provided for transmission via the USB interface to the peripheral. The peripheral receives the informative command and may for instance evaluate the included information for selecting a suitable USB mode that is to be entered or for deciding on becoming a host itself. Alternatively or in addition, the host may generate a request command for retrieving information on all classes offered in all USB modes of a peripheral.

Abstract: In the case of a universal serial bus (USB) connection, a host detects a connection of a peripheral to the host via a USB interface of the host. The host then generates an informative command, which includes information on capabilities of the host. This informative command is provided for transmission via the USB interface to the peripheral. The peripheral receives the informative command and may for instance evaluate the included information for selecting a suitable USB mode that is to be entered or for deciding on becoming a host itself. Alternatively or in addition, the host may generate a request command for retrieving information on all classes offered in all USB modes of a peripheral.

Abstract: Systems and methods applicable, for example, in energy saving functionality. A host device and a connected device might, for instance, exchange data within an instance of an activity period. The host device might, for example, send a request to the connected device. The host device and/or the connected device might, for instance, terminate and/or place hardware into one or more reduced energy consumption modes. Such termination might, for example, allow for data exchange during a subsequent activity period instance.

Abstract: A method and apparatus are disclosed for connecting USB devices in a USB connection to save power and enable role changes between the USB devices in a USB-OTG connection, while the USB devices are in an active state wherein an A-Device informs a B-device, that the A-Device will lower the Vbus-signal to a lower voltage level (e.g. 3.3V), provided the A-Device has recognized that the B-Device supports SRP and HNP. The lowered voltage level enables the A-Device to save the power. The lowered Vbus level now allows the B-Device to raise the Vbus voltage to 5V, which is detected on the A-Device. Whenever the A-Device recognizes, that the B-device has raised Vbus to 5V, the A device interprets this as a request of the B-device to gain the host role. The A-Device suspends the USB-Bus at the earliest possible time to allow the B-Device to perform HNP, and assume the role as host.