Patent ID: 6658497
Filing Date: 2003-12-02
Classification: G06F

Abstract:
A device connection state recognizing method by which a processing unit exhibiting an ability to have connection through a common data bus to a plurality of devices recognizes a connection state of each of said devices, said recognizing method comprising the steps of:previously connecting a portion of or all of a plurality of data signal lines constituting said data bus through one of a pull-up resistor and a pull-down resistor to one of a high electric potential and a low electric potential in accordance with the connection state of said devices; and making said processing unit read, as structure information data, one of a high electric potential state and a low electric potential state generated by one of said pull-up resistor and said pull-down resistor in the portion of or all of said plurality of data signal lines to recognize the connection state of said devices, on the basis of the read structure information data.