| 摘要 |
PURPOSE:To prevent the abnormality of one CPU from extending to the whole multi-CPU system by allowing only a CPU which is registered previously to rewrite some part of the storage area of the memory of the multi-CPU system. CONSTITUTION:Pieces of address information corresponding to respective areas of a data memory 5 and information specifying the CPU corresponding to the address are written in a flag memory 4 previously. Then, when the data memory 5 is accessed, corresponding data is read out of the flag memory 4 according to a write address and a correspondence means 7 makes the data to correspond to CPU indication signals. The result is inputted to a write control means 10 and it is judged whether or not the data which is read out of the flag memory 4 may be written at a write request from the CPU, and when the CPU which makes the write request to correspond to the memory area, the writing operation is allowed. |
