Patent ID: 7219839

Claim:
A method for enhancing a transfer rate of a multimedia card using a differential signal upon transmission and reception of data between the multimedia card and a host controller for controlling the multimedia card, comprising: a first step of determining whether the host controller is a host controller for a high-speed multimedia card; a second step of determining whether the multimedia card is a high-speed multimedia card; a third step of transferring the data using a new data bus (VDAT) channel if the host controller is a host controller for a high-speed multimedia card and the multimedia card is a high-speed multimedia card; and a fourth step of transferring the data using a data bus (DAT) channel if the host controller is not the host controller for the high-speed multimedia card, or if the multimedia card is not the high-speed multimedia card; wherein the high-speed multimedia card configures the VDAT channel capable of transferring the differential signal using a reserved terminal of a conventional multimedia card and a newly added terminal.