Device disconnect detection
AssigneeIntel Corporation
InventorsKok Hong Chan, Huimin Chen
Life of this patent
Estimating the term…
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.
Claims34
1-20. (canceled)
A universal serial bus downstream port, comprising:
- a physical layer to be coupled to a first signal line and a second signal line;
- logic to send packet data to an upstream port on the first signal line and the second signal line;
- logic to send an End-Of-Packet (EOP) signal from the downstream port to the upstream port following the sending of the packet data to cause the upstream port to enter an idle state;
- and
- logic to receive a digital ping indicating a presence of the upstream port.
A universal serial bus upstream port, comprising:
- a physical layer to be coupled to a first signal line and a second signal line;
- and
- logic, upon entering an idle state, to send a digital ping to a downstream port on the first signal line and/or the second signal line to indicate upstream port presence.
A system comprising:
- a universal serial bus downstream port and a universal serial bus upstream port;
- the universal serial bus downstream port comprising:
- a physical layer to be coupled to a first signal line and a second signal line;
- logic to send packet data to the upstream port on the first signal line and the second signal line;
- logic to send an End-Of-Packet (EOP) signal from the downstream port to the upstream port following the sending of the packet data to cause the upstream port to enter an idle state;
- and
- logic to receive a digital ping indicating a presence of the upstream port;
- and
- the universal serial bus upstream port comprising:
- a physical layer to be coupled to the first signal line and the second signal line;
- and
- logic, upon entering an idle state, to send the digital ping to the downstream port on the first signal line and/or the second signal line to indicate upstream port presence.
Dependencies are inferred from the claim text.