| 摘要 |
PURPOSE:To execute preferentially an interruption processing of a disconnect command chain, by setting temporarily a reserve interrupting signal to logic ''1'' at the time point of an end report of one input/output processing, and reserving a coupling with a channel, in case when a disconnect command is being executed. CONSTITUTION:When at least one of latching circuits 9-0-9-n is set by a start instruction of a disconnect command chain, an output of an OR gate 12 becomes logic ''1''. In this state, when a control device reaches an outlet of an executing routine, the control device executes an end report to a channel, and the channel executes a completion report of the input/output processing to a host. When an execution outlet signal becomes logic ''1'', an AND gate 14 outputs logic ''1''. As a result, logic ''1'' is outputted from a latching circuit 10, and a reserve interruption is generated in a channel which is executing a disconnect command through an OR gate 13. |
