Input/output interrupt system

Details Input/output interrupt system Input/output interrupt system

1983-09-06

1987-02-17

Thomas, James D.

Boots, shoes, and leggings

G06F 300

Patent

active

046444629

ABSTRACT:
A data processing system having a channel processing device provided with an input/output device which requires input/output interrupt. The channel processing device responding to a request for input/output interrupt, propagating the request for input/output interrupt to a central processing unit, and reporting the state of the input/output device to the central processing unit. The channel processing device includes an interrupt detecting circuit which detects the request for input/output interrupt sent from the input/output device to the channel processing device, a status information detecting circuit which detects whether the status information sent from the input/output device to the channel processing unit together with the request for input output interrupt is a predetermined specified value, and a counting circuit which counts a predetermined constant time when the status information detecting circuit detects the predetermined specific value so that the request for input/output interrupt is sent to the central processing unit after the counting means counts the constant time.

REFERENCES:
patent: 4056843 (1977-11-01), Bishop et al.
patent: 4207609 (1980-06-01), Luiz et al.
patent: 4348725 (1982-09-01), Farrell et al.
patent: 4400773 (1983-08-01), Brown et al.
IBM Tech. Discl. Bull., vol. 19, No. 11, Apr. 1977, "Class Interrupt Status Save" by R. E. Birney et al., pp. 4055-4059.
IBM Technical Disclosure Bulletin, "Varying Attention Interrupt Delay", D. Chu, vol. 19, No. 4, Sep. 1976, pp. 1320-1321.

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