| 摘要 |
PURPOSE:To avoid the stagnancy of data processings, by releasing the interruption holding state of an input/output device when the interruption is suspended and storing the completion of the preceding access in a memory. CONSTITUTION:A flag part 1 is provided in a controller CU-1', and a flag indicating the generation of a device end signal DEVICEEND is set there. A flag part 2 controls the flag similarly to the flag part 1 and is provided in a controller CU-2'. A latch 4 is set when the access request to an input/output device IO-0' is rejected in the controller CU-1' because of the busy state, and the latch 4 is reset when an interruption is suspended on a channel CH-1. When the latch 4 is set to generate an output in this manner and this output and the access end signal of the controller CU-2' are inputted to an AND gate 5, the AND gate 5 generates an output. |
