| 摘要 |
PURPOSE:To operate a collating circuit only for the occurrence of a true trouble to eliminate the ineffective processing of a central processing unit, by synchronizing dual channel systems and controlling parts with each other, respectively. CONSTITUTION:Control instruction receiving circuits 6 and 7 of channel systems 2 and 3, which are made dual in the thermal stand-by type, and a control instruction transmitting circuit 8 of a channel controlling part 1 receive clocks from a clock supply device 4 through lines 11-13 to operate. When the control instruction transmitting circuit 8 transmits a channel controlling instruction to channel systems through lines 9 and 10, this instruction reaches channel systems 2 and 3 in different times by the difference between transmission delays on lines 9 and 10. Channel systems 2 and 3 take in the control instruction at the same time prescribed by the clock by receiving circuits 6 and 7 and start the control operation. Therefore, operations of channel systems 2 and 3 coincide with each other in respect to time, and a collating circuit 5 detects the dissidence only when operations of channel systems do not coincide with each other truly. |
