Diagnostic method and apparatus for channel control apparatus
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United States of America Patent
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Jan 12, 1988
Grant Date -
N/A
app pub date -
Aug 14, 1985
filing date -
Dec 30, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a system where a central control unit, a main memory unit and a channel control unit are connected to a multi-bus, input/output control units are connected in series through the channel control unit and a common bus and each input/output unit, such as a printer or magnetic tape unit, is connected to each input/output control unit. The channel control unit includes a pseudo-input/output control unit which can simulate the operation of an input/output control unit. This pseudo-input/output control unit is the input/output control unit only for diagnosis of the common bus interface of the channel control. This pseudo-input/output control unit also transfers data in the program mode/direct memory access mode based on a command sent from the channel control unit and communicates the current situation or status to an central control unit through the interrupt sequence after the end of data transfer in the direct memory access mode. Also included is a diagnostic method and an apparatus for a channel control unit which stops the transfer operation and communicates the current situation through the interrupt sequence in case failure of common bus interface is detected during data transfer control.
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