IBM System/360 architecture: Difference between revisions

Revision as of 23:55, 19 March 2025

Revision as of 10:21, 11 June 2025

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* {{Anchor|Channel end|CE}}'''[[#CSW_Channel_end|Channel end]]'''{{sfn|PoOps|p=115}} indicates that the device has completed the data transfer for a channel command. There may also be an [[#Incorrect length|Incorrect length]] indication if the Count field of the CCW is exhausted, depending on the value of the [[#CCW-SuppressLengthIndication|Suppress-Length-Indication]] bit.

* {{Anchor|Device end|DE}}'''[[#CSW_Device_end|Device end]]'''{{sfn|PoOps|p=115}} indicates that the device has completed an operation and is ready to accept another. DE may be signalled concurrently with [[#Channel en|CE]] or may be delayed.

* {{Anchor|Unit check|UC}}'''[[#CSW_Unit_check|Unit check]]'''{{sfn|PoOps|pp=115–116}} indicates that the device or control unit has detected an unusual conditionscondition and that details may be obtained by issuing a Sense command.

* {{Anchor|Unit exception|UE}}'''[[#CSW_Unit_exception|Unit exception]]'''{{sfn|PoOps|p=116}} indicates that the device has detected an unusual condition, e.g., end of file.