Patent ID: 7600060

Claim:
A method of a system including a host and an electronic circuit card that can be inserted into the host and electrically connected to the host, the method comprising: transferring transmission speed information from the host to the electronic circuit card upon inserting the electronic circuit card into the host; transferring a command signal for initializing the electronic circuit card from the host to the electronic circuit card, wherein the command signal has a transmission speed depending on whether a response signal is received from the electronic circuit card to the host in response to the transmission speed information and wherein the host changes the transmission speed to a low transmission speed when the response signal is not received from the electronic circuit card to the host and transfers the changed transmission speed information to the electronic circuit card, wherein the command signal is transferred after a pre-set time after the transferring of the transmission speed information; transferring a response signal from the electronic circuit card to the host when the transmission speed of the electronic circuit card is identical to a transmission speed specified by the transmission speed information received by the electronic circuit card; and transferring data bit width information from the host to the electronic circuit card when the response signal is received by the host from the electronic circuit card within the pre-set time after the transferring of the transmission speed information.