Patent ID: 7577776

Claim:
A serial bus device comprising: address filtering circuitry adapted for connecting to a serial bus for receiving first bus signals from a host including at least one packet having an address field, the address filtering circuitry extracting and storing an original address value of the address field and generating second bus signals which are identical to the first bus signals except for the address field and any other field whose value depends on a value of the address field, wherein the address field of the second bus signals contains a fixed address value which is different from the original address value; a serial bus device controller connected to the address filtering circuitry for receiving the second bus signals having the address field containing the fixed address value, and performing a function in response thereto; and a microcontroller unit connected to the serial bus device controller, the microcontroller unit connected to the address filtering circuitry for retrieving the stored original address value, the microcontroller unit being loaded with firmware for controlling the function of the serial bus device controller based on the retrieved original address value, wherein the serial bus device controller is controlled by the microcontroller to simulate a serial bus device having an address equal to the original address value which is different from the fixed address value contained in the second bus signals received by the serial bus device controller.