US 2019/0102333 A1Published application

Methods and devices for extending usb 3.0-compliant communication over an extension medium

AssigneeIcron Technologies Corporation

InventorsSukhdeep Singh Hundal, Mohsen Nahvi, Remco van Steeden

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Abstract

An upstream facing port device (UFP device) and a downstream facing port device (DFP device) allow a host device and a USB device to conduct SuperSpeed communication via a non-USB compliant extension medium. In some embodiments, the UFP device helps overcome increased latency by generating synthetic packets to be transmitted to the DFP device in order to pre-fetch more data packets from the USB device than requested by the host device. In some embodiments, the DFP device adjusts service interval timing or caches data packets from the host device in order to compensate for the increased latency. In some embodiments, the DFP device transmits a synthetic acknowledgement packet to the UFP device to indicate a larger amount of free buffer space than is present on the USB device to help overcome the increased latency.

Claims17

Dependent claims

An upstream facing port device (UFP device), comprising:

a USB upstream facing port;
and
an extension interface configured to be coupled to a non-USB extension medium;
wherein the UFP device is configured to allow a host device coupled to the USB upstream facing port via a USB-compliant connection to communicate via the extension medium with a USB device coupled to a downstream facing port device (DFP device), by performing actions comprising:
receiving, by the UFP device, a request packet from the host device via the USB upstream facing port, wherein the request packet includes a sequence number and a buffer count, and wherein the sequence number and the buffer count identify a first set of requested data packets;
generating, by the UFP device, a synthetic request packet, wherein the synthetic request packet includes the sequence number of the request packet and a synthetic buffer count, and wherein the sequence number and the synthetic buffer count identify a second set of requested data packets that includes the first set of requested data packets and additional data packets;
transmitting, by the UFP device, the synthetic request packet to the DFP device via the extension medium;
transmitting, by the UFP device, a synthetic response packet to the host device to cause the host device to wait for the first set of requested data packets;
receiving, by the UFP device, data packets from the DFP device;
and
storing, by the UFP device, the received data packets until requested by the host device.

8 more elements

Dependencies are inferred from the claim text.