Patent ID: 7451257
Filing Date: 2008-11-11
Classification: G06F

Abstract:
1. A Universal Serial Bus (USB) device for exchanging data with a USB host connected via a USB cable, the USB device comprising: a USB encoder for outputting USB encoding data; a data output unit outputting one of the USB encoding data and a logic low signal in response to a reset control signal that is activated in a predetermined logic level; and a reset controller controlling a start time at which the reset control signal is activated and varying a duration time during which the reset control signal is activated on the basis of reset information that is written to the reset controller, wherein the reset controller receives the reset information from a microcontroller of a system equipped with the USB device, wherein the data output unit outputs the logic low signal in response to the activation of the reset control signal when a configuration of the USB device is changed during a normal operation irrespective of a power-on operation or a watchdog operation, and wherein the USB host performs a reset operation for detecting the change in the configuration of the USB device when the logic low signal is transmitted to the USB host during a time corresponding to the duration time.