| 摘要 |
PROBLEM TO BE SOLVED: To protect data of high level of importance even though a communication error occurs when data are written. SOLUTION: A connection changeover switch 85 for switching on or off connection from a master device 103 to a main memory 81 is provided on a bus disposed between the master device 103 and the main memory 81. When data to be a write target are written in any of sub memories 82, the master device 103 turns off the connection changeover switch 85 to thereby eliminate the fear that the data written in any of sub memories 82 might be erroneously written in a main memory even though a phenomenon to be a factor in occurrence of a data write error is caused. COPYRIGHT: (C)2007,JPO&INPIT
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