Common polling logic for input/output interrupt or cycle steal d

Details Common polling logic for input/output interrupt or cycle steal d Common polling logic for input/output interrupt or cycle steal d

1976-04-30

1977-07-26

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 304, G06F 1300

Patent

active

040386414

ABSTRACT:
Common logic in a peripheral device control unit responds to a serially propagated poll signal from I/O control logic, or channel, along with a coded signal identifying either a poll for a cycle steal request or a poll for an interrupt request having one of several priorities. The poll signal received will be captured or propagated to following control units dependent upon whether the control unit has requested a cycle steal transfer, or has requested an interrupt at the priority level indicated by the coded signal accompanying the poll signal. Proper functioning of poll capture or propagation is possible even though one of the control units is physically removed from the serial chain of control units.

REFERENCES:
patent: 3680054 (1972-07-01), Bunker et al.
patent: 3828325 (1974-08-01), Stafford et al.

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