Patent ID: 6883056
Filing Date: 2005-04-19
Classification: G06F

Abstract:
1. An apparatus connected to a serial bus and being operable using power supplied from said serial bus or its own power supply, said apparatus comprising: a voltage detector for determining whether or not an output voltage of said power supply of its own is present and outputting the result of the determination; a code generator for generating, based on the result of the determination of said voltage detector, a code indicative of power class information which is information representing which one of the power supplied from said serial bus and said power supply of its own is used for operation of said apparatus; a power-on reset circuit; a changing point detector for detecting a change of the result of the determination output from said voltage detector; and a physical layer circuit responsive to said power-on reset circuit or said changing point detector for varying the connection of said serial bus to perform bus resetting and for placing, when self-identification is performed in response to the occurrence of bus resetting, the code generated by said code generator and indicative of the power class information into a Self-ID packet to be used for transmission of a result of the self-identification to a bus manager and outputting the Self-ID packet.