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I/O Systems

Channel-control-system-having-device-control-block-and-corresponding-device-control-word-with-channel-command-part-and-I-O-command-part

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Channel control system having device control block and corresponding device control word with channel command part and I/O command part

Details

Inventors: Wakatsuki, Kazuyoshi; Yoshiya, Yukihiro; Kameda, Yukio;
Assignee: PFU Limited (Kahoku, JP)
Primary Examiner: Lee; Thomas C.
Assistant Examiner:
Attorney, Agent or Firm: Staas & Halsey

A device control word including a channel command part and an I/O command part is prepared in a main storage unit, and sent to a channel unit together. The channel command part has a common format for different types of I/O devices or I/O controllers thereof, while the I/O command part may have a different format for each type of the I/O devices. Thereby, the same channel unit can be used for or connected to different kinds of I/O controllers by simply modifying software in a central processing unit to correspond to respective I/O controllers.

DETAILED DESCRIPTION An object of the present invention is to provide a general-purpose channel unit which, without changing any function thereof, can be connected to various types of I/O devices or I/O controllers thereof.
Another object of the present invention is to provide a general-purpose channel unit which can control I/O devices or I/O controllers without conscious of the contents of I/O commands.
Yet another object of the present invention is to provide a general-purpose channel unit which can be informed of information, which is necessary to carry out the operation of the I/O command, independently from the I/O command itself.
Still another object of the present invention is to provide a general-purpose channel unit which can perform data transfer in high speed.
To achieve the foregoing and other objects of the present invention and in accordance with the purpose of the invention, there is provided a general-purpose channel control system in which a channel command of a format being common to different types of I/O devices is sent to the channel unit together with the I/O command whose format may be different depending on the type of the I/O device.

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