| 摘要 |
PURPOSE:To prevent the switching of analog interface due to failure in the input and output device, by switching the analog interface with the device selecting signal from the upper-rank device, in the analog interface switch for magnetic tape device or the like. CONSTITUTION:The device selecting instruction and the device number fed from the upper-rank device are respectively received at the tag decoding circuit 14 and the address decoding circuit 15. The circuit 14 inputs the production of the device selecting instruction to the AND circuits 16, 17 via the signal 19, and the circuit 15 inputs the signal indicating the input/output device 2 on the signal line 20 and the signal indicating the input/output device 3 on the signal line 21, respectively to the circuits 16 and 17. Thus, the signal corresponding to the devices 2, 3 is outputted from the circuits 16, 17 and set to the latch circuit 18. The output of the circuit 18 switches the analog switch 13 at the input/output devices 2, 3 corresponding via the signal line 22. |
