Device disconnect detection
AssigneeIntel Corporation
InventorsHuimin CHEN, Kok Hong CHAN
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Abstract
Systems and methods for operating a universal serial bus are described herein. The method includes sending packet data from a USB2 device to a USB2 host on a pair of signal lines, and after sending the packet data, sending an End-Of-Packet (EOP) signal from the USB2 device to the USB2 host. The method also includes, entering the USB2 device into idle state after sending the EOP signal. The method also includes sending a digital ping from the USB2 device to the USB2 host to indicate device presence during idle state.
Claims20
A method of operating a universal serial bus, comprising:
- sending packet data from a Universal Serial Bus 2.0 (USB2) host to a USB2 device on a pair of signal lines, and after sending the packet data, sending an End-Of-Packet (EOP) signal from the USB2 host to the USB2 device;
- after sending the EOP signal, entering the USB2 device into idle state;
- and
- during idle state, sending a digital ping from the USB2 device to the USB2 host to indicate device presence.
A Universal Serial Bus 2.0 (USB2) host comprising:
- a host port comprising a physical layer to send and receive data on a pair of signal lines to a device, the host port to:
- send an End-Of-Packet (EOP) signal to the device following the transmission of packet data, wherein the EOP signal causes a port of the device to enter idle state;
- and
- receive a digital ping from the device to determine the presence of the device.
A Universal Serial Bus 2.0 (USB2) device, comprising:
- a device port comprising a physical layer to drive signals on a first signal line and a second signal line for communicating with a USB2 host;
- wherein, upon entering an idle state, the device port sends a digital ping to the USB2 host on one of the pair of signal lines to indicate device presence.
Dependencies are inferred from the claim text.