| 摘要 |
PURPOSE:To effectively use an FIFO memory without requiring much delay at the time of copying memory access to an action system CPU and an MM in a PER to a stand-by system MM. CONSTITUTION:In a CPY 50, address multiplex information, reading/writing information and an address data identification (ID) bit 550 are transmitted/ received between an MUX 510 and an FIFO 540 and between a DMX 531 and the FIFO 540. When a DET 520 detects an alarm, memory access is abnormally ended and the invalidity of data is informed. |
