| 摘要 |
PURPOSE:To perform redundancy switching of data in a system for which high reliability is requested without losing the data. CONSTITUTION:The data loss detection part 40 of an address control part 4 monitors the counting up of addresses in the address counters 12 and 22 of data storage parts 1 and 2 and judges data loss conditions. Address backdating parts 41 and 42 backdate current addresses from the address counters 12 and 22 corresponding to fault information from OR gates 43 and 44, generate the addresses before a fault is generated and output them to data read control parts 13 and 23. A changeover control part 45 generates a changeover instruction corresponding to backdating information from the address backdating parts 41 and 42 and outputs the changeover instruction to a data switching part 3. |
