| 摘要 |
PURPOSE:To end an access with no addition of an unnecessary waiting cycle by releasing a waiting state when an access is given to a memory as long as no fault is detected. CONSTITUTION:A multi-processor contains a memory 5 which is shared by at least 2 central processing units CPU, e.g., CPU 1 and 2. When either one of both CPU 1 and 2 gives an access to the memory 5, a waiting state is applied to said CPU. When a memory abnormality detecting circuit 6 which checks the errors of the memory 5 detects no error, the waiting state is released. In such a way, a waiting state is immediately released when no fault occurs. Thus an unnecessary waiting cycle is avoided.
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