| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an input and output device consisting of the composition of two or more input and output device sharing the bus to a host and satisfactorily recognizable by the host as one device similar to the single body of the respective devices. <P>SOLUTION: A composite I/O card 10 comprises a memory unit 1A and an I/O unit 2A. The input and output parts 11A and 21A of the respective units are connected to the host H by the common bus 3. The host H transmits a command to the command decoding parts 13 and 23 of both the input and output parts through a command line CMD. The respective command decoding parts set responses to the command. State reporting parts 15A and 25A report the respective states of their own input and output parts to the other input and output part. Response suppression parts 16A and 26A suppress the responses by the command decoding parts 13 and 23 of their own input and output parts based on the reported states, and transmit only a proper one of the responses to the host H. <P>COPYRIGHT: (C)2004,JPO |
