| 摘要 |
PURPOSE:To prevent the system breakdown for the information processor which performs the memory access to the main memory, by detecting the unconnected state of the memory unit to the memory access address and then generating the program interruption which can be executed again. CONSTITUTION:The access request address given from operation part 11 is converted into the real address to be supplied to register 14 in processor 1. Detection circuit 15 for presence or absence of allotment for the real/physical addresses gives checking whether memory unit 6 of the address corresponding to the real address is allotted or not. And if no allotment is given, the request is inhibited from register 14 to the memory interface control unit. Part 1 checks the checking result to suppress the renewal of the register group if no exceptional factor exists. And the state under which the order can be executed again is kept to generate the program interruption, thus preventing the system breakdown. |
