Interrupt controller

Details Interrupt controller Interrupt controller

1998-08-13

2000-05-30

Sheikh, Ayaz R.

Electrical computers and digital data processing systems: input/

Interrupt processing

Interrupt prioritizing

710 41, 710265, 710266, 712 23, 712244, G06F 1326

Patent

active

060702214

ABSTRACT:
An interrupt controller comprises a plurality of interrupt handling elements that are given different identification numbers for identification to which priorities are assigned. A first priority encoder accepts a plurality of level signals which are given different level numbers respectively representing the priorities assigned to the identification numbers, and then encodes the level number assigned to the highest-priority level signal included among all level signals at a low potential so as to generate an interrupt level number representing the encoded level number. Each interrupt handling element includes a current-sinking unit for sinking one of the level signals specified by the output of a level number register into a ground so that the specified level signal sinks to a low potential, and a comparator for comparing the level number represented by the output of the level number register with the interrupt level number from the first priority encoder to generate a comparison result signal indicating the comparison result. A second priority encoder accepts a plurality of comparison result signals from the plurality of interrupt handling elements, and then encodes the identification number assigned to one of the interrupt handling elements whose identification number has the highest priority and which is included among all interrupt handling elements each of which has furnished a comparison signal indicating that a corresponding level number is equal to the interrupt level number from the priority encoder so as to generate an interrupt identification number representing the encoded identification number.

REFERENCES:
patent: 4470111 (1984-09-01), Jenkins et al.
patent: 4636944 (1987-01-01), Hodge
patent: 5133056 (1992-07-01), Miyamori
patent: 5659759 (1997-08-01), Yamada
patent: 5764971 (1998-06-01), Shang et al.
patent: 5905898 (1999-05-01), Qureshi et al.

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