| 摘要 |
PURPOSE:To use a memory device of an active system while restoring automatically the memory if a temporary parity check fault is generated because of a software error by writing simultaneously a data from an active or spare system processor to the active system and spare system memory devices at all times. CONSTITUTION:Data are written simultaneously from the active system and spare system processors CPU#0 and CPU#1 to the active system and spare system memory devices MEM#0 and MEM#1 at all times. Thus, the MEM#0 and MEM#1 store the same data at the normal operation. An address register A- REG#0 of the active system and a data check circuit D-CHECK#0 of the active system are connected to the CPU#0 and the MEM#0 and the MEM#1 is connected to the check circuit. Further, the data from the MEM#1 is fed to the CPU#0 via the data register D-REG#0 of the active system to the active system detecting a momentary error to restore and use the MEM#0 automatically. |
