Via Technologies, Inc.

Terrance Shih

Chin-Sung Hsu

Jiin Lai

Yi-Lin Lai

Hui Jiang

Jinkuan Tang

Buheng Xu

Hao-Hsuan Chiu

Chun-Heng Lin

An apparatus is provided for coupling a Universal Serial Bus (USB) device and a USB host. The apparatus includes a memory and a controller. The memory includes one or more descriptor entries. The controller is configured to obtain a descriptor of the USB device upon detection of the USB device on a USB bus, and compare the descriptor to a specific descriptor entry to generate a comparing result. Then the controller enables or disables a link path between the USB host and the USB device according the comparing result.

Apparatus for coupling to a USB device and a host and method thereof

A universal serial bus (USB) transaction translator is provided along with a micro-frame synchronization method. A device interface is coupled to a device via a device bus, and a host interface is coupled to a host via a host bus. At least two buffers are configured to store data. A controller stores the data in the buffers alternately. A start-of-frame (SOF) counter is used to count the SOF packets, with the counting value of the SOF counter being compared to a predefined value. Specifically, the controller resets a SOF timer for sending the SOF packet when the counting value achieves or exceeds the predefined value, such that the SOF packet and an isochronous timestamp packet (ITP) from the host are sent at the same time. Further, the controller delays the sending of the SOF packet for a period of time according to the ITP from the host.

USB transaction translator with SOF timer and USB transaction translation method for periodically sending SOF packet

An apparatus is provided for charging a Universal Serial Bus (USB) device according to an optimal charging mode. The apparatus includes a charging module that is configured to obtain a descriptor from the USB device upon detection of the USB device on a USB bus. The charging module includes one or more descriptor entries disposed in a memory and a controller. The one or more descriptor entries include descriptor data, for matching the descriptor to a specific descriptor entry, and charging data, that specifies the optimal charging mode for the USB device. The controller is coupled to the memory, and is configured to match the descriptor to the specific descriptor entry, and is configured to initiate the optimal charging mode on the USB bus according to the charging data.

USB charging module

A USB hub and a method thereof. The USB hub supplies power to a USB device, is connected between the USB device and a USB host under a working power state, and comprises an upstream port, a downstream port, a power port, and a controller. The upstream port is coupled to the USB host. The downstream port is coupled to the USB device. The power port is coupled to a power source. The controller is coupled to the upstream port, the downstream port, and the power port, and determines whether the USB host has left the working power state, and determines whether the USB device is electrically chargeable, when the USB host has left the working power state. The downstream port provides power to the USB device from the power source when the USB device is electrically chargeable.

USB hub for supplying power upon determination whether a USB device is chargeable according to data transfer rate of the USB device

The present invention is directed to a universal serial bus (USB) transaction translator and a micro-frame synchronization method. A device interface is coupled to a device via a device bus, and a host interface is coupled to a host via a host bus, wherein the host USB version is higher than the device USB version. At least two buffers configured to store data are disposed between the device interface and the host interface. A controller stores the data in the buffers alternately. A start-of-frame (SOF) counter is used to count the SOF packets, wherein the counting value of the SOF counter is compared to a predefined value. Specifically, the controller resets a SOF timer for sending the SOF packet when the counting value achieves the predefined value or is greater than the predefined value, such that the SOF packet and an isochronous timestamp packet (ITP) from the host are sent at the same time. Further, the controller delays the sending of the SOF packet for a period of time according to the ITP from the host. In another embodiment, the sending period of SOF packets may be dynamically adjusted in isochronous transfer.

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Taipei, Taiwan

Terrance Shih