| 摘要 |
A data transmission apparatus includes first and second interfaces for interfacing a data signal in response to a command from an external device. First and second interface controllers control the first and second interfaces, respectively. A memory temporarily stores the data signal. A first controller is connected to the first and second interfaces and to a second controller. The first interface controller generates a first table and supplies the first table to the second controller. The second controller determines whether the command causes data transfer using the first table, and controls the first controller to analyze the command if the command causes data transfer. The first controller generates memory information including an access position and source and destination addresses. A designated source interface controller stores the data signal in the memory, then a designated destination interface controller reads the data signal from the memory. A method of transmitting data includes the steps of receiving a command from an external device with a first interface, supplying the command to the first interface controller for controlling the first interface, generating a first table, determining whether the command causes data transfer using on the first table, analyzing the command if the command causes data transfer, generating access position information with respect to memory based on the first table and source and destination addresses, storing the data signal in the memory based upon the source address, and reading the data signal from the memory and outputting the data signal based upon the destination address.
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