| 摘要 |
PURPOSE:To enable only a prescribed processor to access a prescribed area of a common memory by suppressing the access of a processor in the case of discordance between the processor number of this process which will access the common memory and registered processor numbers. CONSTITUTION:Numbers of processors which are permitted to access the common memory are registered in tables 1 and 2 corresponding to addresses of the common memory, and the number of the processor which will access the common memory and processor numbers which are read out from tables 1 and 2 by the address of this processor are compared with each other by comparing circuits 4 and 5, and the access of this processor to the common memory is suppressed when this comparison results in discordance. Thus, the common memory is so protected that only a prescribed processor can access the prescribed area of the common memory. |
