| 摘要 |
An apparatus and method allocate relative card addresses (RCAs) for multimedia cards in a digital data player with a multimedia card stack configured to receive those multimedia cards. Respective slot positions of the multimedia cards inserted in the multimedia card stack can be recognized, thereby allowing respective RCAs to be allocated for the position-recognized multimedia cards. The apparatus includes a number of multimedia cards inserted in the slots and adapted to download and/or upload data under a control of a multimedia card controller using a relative card address. The multimedia card controller sequentially outputs clock control signals, each adapted to supply a clock signal to only one of the slots selected by that clock control signal. A relative address is then allocated to the multimedia card inserted in the selected slot in response to the clock control signal. A number of switches are used to selectively supply the clock signal to one of the multimedia cards in response an associated clock control signal, while preventing the clock signal from reaching the remaining multimedia cards.
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