Title:
METHOD OF AND APPARATUS FOR DIAGNOSING CHANNEL CONTROL UNIT
Document Type and Number:
WIPO Patent Application WO/1985/003151
Kind Code:
A1
Abstract:
A method of diagnosing a channel control unit, together with an apparatus suitably employed to carry out the method. A system is arranged such that a central control unit, a main memory and a channel control unit are connected to a multi-bus, and input/output controllers are connected to the channel control unit one after another through a common bus, the input/output controllers being respectively connected with input and output devices, such as a printer and a magnetic tape device. The channel control unit is provided with a pseudo input/output controller which is capable of simulating the respective operations of the input/output controllers. The pseudo input/output controller is an input/output controller which is exclusively employed to diagnose a common bus interface of the channel control unit. On the basis of instructions from the channel control unit, the pseudo input/output controller effects data transfer in the program mode and the direct memory access mode. After the completion of data transfer in the direct memory access mode, the pseudo input/output controller executes an interruption sequence and then informs the central control unit of the result of the diagnosis. When an abnormality in the common bus interface is detected during the data transfer control, the transfer operation is suspended, and the pseudo input/output controller executes the interruption sequence and then effects the informing operation.
Inventors:
OGASAWARA YASUO (JP)
Application Number:
PCT/JP1984/000621
Publication Date:
July 18, 1985
Filing Date:
December 27, 1984
Export Citation:
Assignee:
FUJITSU LTD (JP)
International Classes:
G06F13/12; G06F11/22; G06F11/267; G06F11/26; (IPC1-7): G06F13/00; G06F11/22
Foreign References:
| JPS5099649A | 1975-08-07 | |||
| JPS5627427A | 1981-03-17 | |||
| JPS5518778A | 1980-02-09 |
Other References:
See also references of EP 0169244A4
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