Multiple virtual USB devices with virtual HUB implemented...

Details Multiple virtual USB devices with virtual HUB implemented... Multiple virtual USB devices with virtual HUB implemented...

2007-05-14

2009-08-18

Sorrell, Eron J (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

C710S065000, C710S072000, C710S074000

Reexamination Certificate

active

07577776

ABSTRACT:
A USB device using one USB device controller to simulate multiple virtual USB devices with a virtual USB hub is described. The USB device controller is assigned a USB address and communicates with the USB host under the control of an MCU and its firmware. The USB device also includes a CPLD (or FPGA or ASIC) and an analog switch for filtering the USB packets from the host and replacing the address in the packet by a fixed address before sending the packet to the USB device controller. The address in the original packet is stored in the CPLD and accessible by the MCU. The MCU controls the USB device controller to simulate one or more USB hubs and multiple USB devices.

REFERENCES:
patent: 2001/0018646 (2001-08-01), Nagashima et al.
patent: 2003/0041205 (2003-02-01), Wu et al.
patent: 2004/0203415 (2004-10-01), Wu
patent: 2005/0204026 (2005-09-01), Hoerl
patent: 2008/0071962 (2008-03-01), Yang et al.
patent: 2008/0215773 (2008-09-01), Christison et al.

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