Abstract: This invention relates to a method, a computer program product, an apparatus and a system for switching a first switching unit of an apparatus into a state out of a set of states, wherein said apparatus comprises a first serial interface and a second serial interface, each of this first and second serial interfaces comprises at least one data line and a power supply line, and wherein said first switching unit is coupled to the power supply line of both said first serial interface and said second serial interface, wherein said set of states comprises a first state for connecting the power supply of said first serial interface to the power supply of said second serial interface, and a second state for connecting the power supply of said first serial interface to a first further power supply line, said first further power supply line being configured to be connected to a first power supply.

Abstract: This invention relates to a method, a computer program product, an apparatus and a system for switching a first switching unit of an apparatus into a state out of a set of states, wherein said apparatus comprises a first serial interface and a second serial interface, each of this first and second serial interfaces comprises at least one data line and a power supply line, and wherein said first switching unit is coupled to the power supply line of both said first serial interface and said second serial interface, wherein said set of states comprises a first state for connecting the power supply of said first serial interface to the power supply of said second serial interface, and a second state for connecting the power supply of said first serial interface to a first further power supply line, said first further power supply line being configured to be connected to a first power supply.

Abstract: A method comprises the steps of determining values of one or more parameters of a first energy reservoir in a first device and corresponding parameters of a second energy reservoir in a second device, and setting a direction for transferring energy between the first energy reservoir and the second energy reservoir. The direction may be set based on the voltage of the first energy reservoir and the voltage of the second energy reservoir, based on an input from a user, or based on the values of one or more parameters of the first energy reservoir and the second energy reservoir obtained in a device-to-device communication between the first device and the second device. A bi-directional charging interface for executing the method comprises two energy paths in opposite directions and a control unit for setting the direction for the energy transfer.

Abstract: A device for attachment to a host for serial data communication including means for transferring to the host a predetermined data structure indicating whether or not the device supports direct memory access.

Abstract: A method for use where a first and second device are connected A method comprises interacting with a first device and a second device. The first and second devices are connected together. A selection is made, based on an interaction order of said first and second devices, as to which one of said devices to be a master device.

Abstract: A device for attachment to a host for serial data communication including means for transferring to the host a predetermined data structure indicating whether or not the device supports direct memory access.