| 摘要 |
PURPOSE:To specify a faulty RAM and to continuously operate a system by detecting a faulty dynamic RAM element from among plural dynamic RAM elements in the central processing unit of the system with the aid of the output signal of a logic circuit and the detection signal of plural parity check circuits. CONSTITUTION:The parity check of the data is performed for respective plural dynamic RAM elements 11 to 14, and a parity error is detected by these detection signals for parity check, an active state is detected, and a RAM5 for reserve is connected to the data bus for the system instead of the faulty dynamic RAM element by the detection signal of the parity check for the active state. Thus, the faulty active RAM element can be specified by the parity detection signal of the active state, and the system can be continuously used without temporarily terminating the system. |
