| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique that prevents data read from a bus, to which a memory is connected and from a peripheral device from colliding with each other, even if the peripheral device is connected to the bus. SOLUTION: This computer system includes a memory a peripheral device 300, to which an address overlapping with part of an address space allocated to the memory is allocated; a CPU 200 which when accessing either the memory or the peripheral device, sends a signal matching the address of the accessed memory or device; and a bus for connecting the CPU 200 to the peripheral device 300. A switch is provided for connecting or disconnecting the CPU 200 to or from the memory via the bus. Further, the peripheral device is provided with an interface part 310, that receives the signal sent from the CPU 200 to the bus and specifies the address represented by the signal, and a decoding part 330 that turns off the switch 410, when the address specified by the interface part 310 is the address of the peripheral device. COPYRIGHT: (C)2006,JPO&NCIPI
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