| 摘要 |
PURPOSE:To prevent the hang of the software of a CPU, by holding the report of the switching the NOT READY state to the READY state until the report of the request for intervention through an input/output device. CONSTITUTION:A flip-flop 9 is set when the conditions are satisfied for all facts that an interface signal SVO is at an on-state, the unit check is given to the channel and that an intervention request is at an on-state, respectively. Then the flip-flop 9 is reset when a sense command is received and other conditions are all satisfied. With the setting and resetting of the flip-flop 9, +SUCK and -SUCK are turned on, respectively. A flip-flop 10 is set when -SUCK is turned on and an input/output device has been switched to the READY state. With the setting of the flip-flop 10, +RQi is turned on to be sent to a channel. |
