Interrupt branch address formed by concatenation of base address

Details Interrupt branch address formed by concatenation of base address Interrupt branch address formed by concatenation of base address

1998-02-02

2000-05-09

An, Meng-Ai T.

Electrical computers and digital processing systems: processing

Processing control

Branching

710264, 345509, G06F 946

Patent

active

06061787&

ABSTRACT:
An interrupt service table pointer (ISTP) facilitates fast branching to interrupt service routines. An interrupt service table base (ISTB) field establishes a base address at which one or more routines reside in memory. A highest priority enabled interrupt (HPEINT) field identifies an interrupt to service. The concatenation of the ISTB, the HPEINT, and one or more least significant zeros points to the first instruction of a group of instructions which service a specific interrupt. The ISTB is user programmable. The HPEINT is automatically calculated each cycle by the data processor incorporating the ISTP.

REFERENCES:
patent: 4268904 (1981-05-01), Suzuki et al.
patent: 5027290 (1991-06-01), Kirk et al.
patent: 5287523 (1994-02-01), Allison et al.
patent: 5594905 (1997-01-01), Mital

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