USB-HUB device and its control method

摘要

A USB-HUB device in which a request for a device connected to a port of the USB-HUB device may be executed by commonly using a serial interface engine of the HUB device has been disclosed. A USB-HUB device (1) may include a HUB address register (124), a HID address register (125), a first comparator (123), a second comparator (113), a virtual port control unit (18) and a HID request processing unit (131). A HID address register (125) may store a HID address. A first comparator (123) may compare a value of a HUB address register (124) with an address field of a supplied token packet. A second comparator (113) may compare a value of a HID address register (125) with an address field of the supplied token packet. A virtual port control unit (18) may indicate a status of a port to which a device (3) may be virtually connected. A HID processing unit (131) may perform a process in response to a request for the device (3).