Methods and devices for universal serial bus port event extension

A method capable of propagating USB events between a host and a device over a distance greater than that allowed by the USB specification, the method comprising:

• initiating a bus reset with the device;
• prolonging the bus reset at least until a notification is received that a bus reset has been completed by the host, wherein prolonging the bus reset includes:
• transmitting one or more signals to the device associated with a reset;
• and
• continuing to transmit the one or more signals at least until the notification is received that the bus reset has been completed by the host;
• and
• exchanging bus traffic with the device upon completion of the bus reset;
• wherein the one or more signals includes a chirp K/J pair.

A system for communication between a USB-compliant host and a USB-compliant device that are separated by a non-USB communication link, the system comprising:

• an upstream facing port coupled to the host via a USB connection;
• and
• a downstream facing port coupled to the device via a USB connection and capable of establishing a communication link to the upstream facing port;
• wherein the downstream facing port is configured to extend completion of a USB event with the device at least until a notification is received that a corresponding event has been completed between the upstream facing port and the host;
• wherein the USB event is a resume command;
• and
• wherein the upstream facing port is configured to:
• detect an initiation of a resume command from the host;
• and
• transmit a resume detected message to the downstream facing port.

A system for communication between a USB-compliant host and a USB-compliant device that are separated by a non-USB communication link, the system comprising:

• an upstream facing port coupled to the host via a USB connection;
• and
• a downstream facing port coupled to the device via a USB connection and capable of establishing a communication link to the upstream facing port;
• wherein the downstream facing port is configured to extend completion of a USB event with the device at least until a notification is received that a corresponding event has been completed between the upstream facing port and the host;
• wherein the USB event is a reset command;
• wherein the upstream facing port is configured to detect initiation of a reset command from the host and transmit a reset detected notification to the downstream facing port;
• wherein extending completion of a USB event with the device includes receiving the reset detected notification from the upstream facing port, transmitting at least one signal to the device to begin a bus reset, and continuing to transmit the at least one signal associated with the bus reset until a reset done message is received;
• and
• wherein continuing to transmit the at least one signal associated with the bus reset comprises continuously transmitting chirp K/J pairs.

A system for communication between a USB-compliant host and a USB-compliant device that are separated by a non-USB communication link, the system comprising:

• an upstream facing port coupled to the host via a USB connection;
• and
• a downstream facing port coupled to the device via a USB connection and capable of establishing a communication link to the upstream facing port;
• wherein the downstream facing port is configured to extend completion of a USB event with the device at least until a notification is received that a corresponding event has been completed between the upstream facing port and the host;
• wherein the USB event is a remote wakeup, and wherein the downstream facing port is further configured to:
• detect an initiation of a remote wakeup from the device;
• transmit at least one signal associated with a bus resume to the device;
• transmit a remote wakeup message to the upstream facing port;
• and
• continue to transmit the at least one signal associated with the bus resume to the device until a resume done message is received.

A computing device configurable to provide a downstream facing port (DFP) for allowing a USB device to communicate with a host via an upstream facing port (UFP), wherein the DFP is configured to:

• transmit a connected message to the UFP;
• transmit a signal to the USB device to initiate a reset in response to receiving a reset detected message from the UFP;
• and
• extend the reset at least until a reset done message is received from the UFP;
• wherein a speed of the USB device is high speed;
• and
• wherein extending the reset includes transmitting chirp K/J pairs at least until the reset done message is received.

A method capable of propagating USB events between a host and a device over a distance greater than that allowed by the USB specification, the method comprising:

• initiating a bus reset with the device;
• prolonging the bus reset at least until a notification is received that a bus reset has been completed by the host;
• and
• exchanging bus traffic with the device upon completion of the bus reset;
• wherein the method further comprises one or more of exchanging bus traffic with the device before initiating the bus reset or placing the device in a suspend state before initiating the bus reset.