| 摘要 |
<p>A high speed multi-media card system for automatic detection of high speed communication comprises a host; and one or more media cards (74,76), coupled to the host (72) through one or more data lines, at least one of which is a serial data line, said one or more media cards each having a unique card identification number associated therewith and responsive to a first command from the host requesting each card's unique card identification number and responsive thereto. The media cars send their respective card identification number, through the serial data line, to the host and if the sent card identification number matches that which is expected from the host, the host transmits a second command assigning a relative card address to the card whose card identification number made the match. The media cards drive a predetermined value on all or a portion of the one or more of data lines and the host automatically senses the predetermined value which is indicative of operation at high speeds by the cards which have driven said predetermined value on the data lines, the host communicating in high speed mode with the cards which have driven the predetermined value on the data lines.</p> |
