Bus Connection Device

• US 20070245059A1
• Filed: 05/24/2005
• Published: 10/18/2007
• Est. Priority Date: 05/28/2004
• Status: Active Grant

• Current Assignee: Future Link Systems, LLC (Vector Capital Corporation)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Tjia, Jerome
• Granted Patent: US 7,484,031 B2
• Time in Patent Office: Days
• US Class Current: 710/313
• CPC Class Codes: G06F 13/4027 using bus bridges G06F13/4022 takes precedence
• CPC Class Codes: G06F 2213/0042 Universal serial bus [USB]

Abstract

A bus connection device, in the form of a hardware dongle, can be connected to a first electronic device, in the form of a USB peripheral device, and a second electronic device can be connected thereto. The dongle can determine whether the second connected device is a USB host device or a USB peripheral device and, if the second electronic device is a USB host device, it is connected directly to the first electronic device. If the second electronic device is a USB peripheral device, the bus connection device operates to allow the first electronic device to operate as a host device. When the bus connection device is operating to allow the first electronic device to act as a USB host device, it regularly sends tokens to the first electronic device and to the second electronic device, to which the first electronic device can respond by transmitting data intended for the second electronic device, and to which the second electronic device can respond by transmitting data intended for the first electronic device.

Claims

1. A bus connection device, for connection to a first electronic device, and having means by which a second electronic device can be connected thereto,

wherein the bus connection device is adapted to determine whether the second connected device is a host device or a peripheral device and, if the second electronic device is a host device, it is connected directly to the first electronic device whereas, if the second electronic device is a peripheral device, the bus connection device operates to allow the first electronic device to operate as a host device,

wherein, when the bus connection device is operating to allow the first electronic device to act as a host device, said bus connection device regularly sends tokens to the first electronic device and to the second electronic device, to which the first electronic device can respond by transmitting data intended for the second electronic device, and to which the second electronic device can respond by transmitting data intended for the first electronic device.

2. A bus connection device as claimed in claim 1, wherein the bus connection device is adapted to determine whether the second connected device is a USB host device or a USB peripheral device and, if the second electronic device is a USB host device, it is connected directly to the first electronic device whereas, if the second electronic device is a USB peripheral device, the bus connection device operates to allow the first electronic device to operate as a USB host device.

3. A bus connection device as claimed in claim 2, wherein the means by which the second electronic device can be connected thereto comprises a USB mini-AB socket, and wherein the bus connection device is adapted to determine whether the second connected device is a USB host device or a USB peripheral device on the basis of a type of plug inserted into the mini-AB socket.

4. A bus connection device as claimed in claim 2, wherein, if the second electronic device is a USB peripheral device, the bus connection device is adapted to determine if an endpoint in the second electronic device is used for Bulk or Isochronous transactions.

5. A bus connection device as claimed in claim 4, wherein, if the second electronic device is a USB peripheral device, and the endpoint in the second electronic device is used for Isochronous transactions, then, when said bus connection device sends tokens to the first electronic device or to the second electronic device, to which said first electronic device or said second electronic device can respond by transmitting data, said bus connection device also sends tokens to the second electronic device or to the first electronic device, to indicate to said second electronic device or said first electronic device that it may receive transmitted data.

6. A bus connection device as claimed in claim 4, wherein said bus connection device is adapted, if it is determined that said second electronic device is a USB peripheral device and an endpoint in said second electronic device is used for Isochronous transactions, to pass any data received from said first electronic device directly through to said second electronic device without buffering, and to pass any data received from said second electronic device directly through to said first electronic device without buffering.

7. A bus connection device as claimed in claim 4, wherein said bus connection device is adapted, if it is determined that said second electronic device is a USB peripheral device and an endpoint in said second electronic device is used for Bulk transactions, to store each packet of data received from said first electronic device in a FIFO, and to pass said packet of data through to said second electronic device before receipt of a further packet of data, and to store each packet of data received from said second electronic device in a FIFO, and to pass said packet of data through to said first electronic device before receipt of a further packet of data.

8. A bus connection device as claimed in claim 1, wherein, when the bus connection device is operating to allow the first electronic device to act as a host device, said bus connection device sends tokens to the first electronic device, to which the first electronic device can respond by transmitting data intended for the second electronic device, and sends tokens to the second electronic device, to which the second electronic device can respond by transmitting data intended for the first electronic device, according to a predetermined schedule.

9. A bus connection device as claimed in claim 1, wherein the bus connection device is adapted for connection to a first electronic device by means of USB D+/D−

lines, and wherein the bus connection device is adapted to receive data and control information over said USB D+/D−

lines.

10. A bus connection device as claimed in claim 9, wherein the bus connection device is adapted to send tokens to the first electronic device and to the second electronic device, and to receive control information from the first electronic device, according to a predetermined schedule.

11. A bus connection device as claimed in claim 1, wherein, when the first electronic device or the second electronic device responds to one of said tokens by transmitting data, the bus connection device is adapted to pass said data through to the second electronic device or to the first electronic device on a packet-by-packet basis.

12. A bus connection device as claimed in claim 1, wherein the bus connection device is adapted to receive first control information from the first electronic device for the bus connection device itself, and is further adapted to receive second control information from the first electronic device for the second electronic device, and is adapted to pass said second control information to the second electronic device.

13. A bus connection device as claimed in claim 12, wherein the bus connection device is adapted to send a vendor specific command, relating to the second electronic device, to the first electronic device, and is adapted to receive the second control information from the first electronic device for the second electronic device on the basis of said vendor specific command.

14. A method of operation of a bus connection device, the bus connection device being connected to a first electronic device, and having a second electronic device connected thereto,

wherein the bus connection device determines whether the second electronic device is a host device or a peripheral device and, if the second electronic device is a host device, it is connected directly to the first electronic device whereas, if the second electronic device is a peripheral device, the bus connection device operates to allow the first electronic device to operate as a host device,

wherein, when the bus connection device is operating to allow the first electronic device to act as a host device, said bus connection device regularly sends tokens to the first electronic device and to the second electronic device, to which the first electronic device can respond by transmitting data intended for the second electronic device, and to which the second electronic device can respond by transmitting data intended for the first electronic device.

15. A method as claimed in claim 14, wherein the bus connection device determines whether the second connected device is a USB host device or a USB peripheral device and, if the second electronic device is a USB host device, it is connected directly to the first electronic device whereas, if the second electronic device is a USB peripheral device, the bus connection device operates to allow the first electronic device to operate as a USB host device.

16. A method as claimed in claim 15, wherein the bus connection device comprises a USB mini-AB socket, and wherein the bus connection device determines whether the second connected device is a USB host device or a USB peripheral device on the basis of a type of plug inserted into the mini-AB socket.

17. A method as claimed in claim 15, wherein, if the second electronic device is a USB peripheral device, the bus connection device determines if an endpoint in the second electronic device is used for Bulk or Isochronous transactions.

18. A method as claimed in claim 17, wherein, if the second electronic device is a USB peripheral device, and the endpoint in the second electronic device is used for Isochronous transactions, then, when said bus connection device sends tokens to the first electronic device or to the second electronic device, to which said first electronic device or said second electronic device can respond by transmitting data, said bus connection device also sends tokens to the second electronic device or to the first electronic device, to indicate to said second electronic device or said first electronic device that it may receive transmitted data.

19. A method as claimed in claim 17, wherein, if it is determined that said second electronic device is a USB peripheral device and an endpoint in said second electronic device is used for Isochronous transactions, said bus connection device passes any data received from said first electronic device directly through to said second electronic device without buffering, and passes any data received from said second electronic device directly through to said first electronic device without buffering.

20. A method as claimed in claim 17, wherein, if it is determined that said second electronic device is a USB peripheral device and an endpoint in said second electronic device is used for Bulk transactions, said bus connection device stores each packet of data received from said first electronic device in a FIFO, and passes said packet of data through to said second electronic device before receipt of a further packet of data, and stores each packet of data received from said second electronic device in a FIFO, and passes said packet of data through to said first electronic device before receipt of a further packet of data.

21. A method as claimed in claim 14, wherein, when the bus connection device is operating to allow the first electronic device to act as a host device, said bus connection device sends tokens to the first electronic device, to which the first electronic device can respond by transmitting data intended for the second electronic device, and sends tokens to the second electronic device, to which the second electronic device can respond by transmitting data intended for the first electronic device, according to a predetermined schedule.

22. A method as claimed in claim 14, wherein the bus connection device is adapted for connection to a first electronic device by means of USB D+/D−

lines, and wherein the bus connection device receives data and control information over said USB D+/D−

lines.

23. A method as claimed in claim 22, wherein the bus connection device sends tokens to the first electronic device and to the second electronic device, and receives control information from the first electronic device, according to a predetermined schedule.

24. A method as claimed in claim 14, wherein, when the first electronic device or the second electronic device responds to one of said tokens by transmitting data, the bus connection device passes said data through to the second electronic device or to the first electronic device on a packet-by-packet basis.

25. A method as claimed in claim 14, wherein the bus connection device receives first control information from the first electronic device for the bus connection device itself, and receives second control information from the first electronic device for the second electronic device, and passes said second control information to the second electronic device.

26. A method as claimed in claim 25, wherein the bus connection device sends a vendor specific command, relating to the second electronic device, to the first electronic device, and receives the second control information from the first electronic device for the second electronic device on the basis of said vendor specific command.