Patent ID: 6868456
Filing Date: 2005-03-15
Classification: G06F

Abstract:
1. A universal serial bus device to be initialized as a state enabling a communication with a host, the host storing a real descriptor and a descriptor recognizing program, comprising: an interface storing a predetermined basic descriptor, the interface primarily activating an initialization signal and transferring the basic descriptor to the host to perform a primary initialization, the interface downloading the real descriptor in response to a download command generated from the host, and secondarily activating the initialization signal and transferring the real descriptor to the host to perform a secondary initialization; at least one signal line for guiding the basic descriptor, the real descriptor and the download command, the at least one signal line being enabled with a terminal voltage; a voltage regulator providing the terminal voltage to the signal line while the initialization signal is activated; a memory storing the basic descriptor; a register for storing the real descriptor generated from the host; a command analyzing portion receiving the real descriptor and the download command from the host and generating a download start signal; and a descriptor read/write portion transferring the basic descriptor stored in the memory to the host, the descriptor read/write portion transferring the real descriptor outputted from the command analyzing portion to the register in response to the download start signal and generating a download completion signal and providing the real descriptor stored in the register to the host.