Software interrupt generator for computer bus interface

Details Software interrupt generator for computer bus interface Software interrupt generator for computer bus interface

1997-07-11

1998-07-07

Shah, Alpesh M.

395309, 395733, G06F 1300

Patent

active

057782423

ABSTRACT:
A computer peripheral interface solves the problem of the interrupt-line mismatch between the PCI and ISA bus architectures without requiring additional interrupt lines between ISA devices and the computer. To accomplish this, a PCI-ISA bridge is provided that responds to ISA interrupts by generating a predetermined software interrupt instruction over the PCI bus. The peripheral interface includes a software-interrupt register and associated circuitry for accepting this software interrupt instruction and generating a corresponding simulated hardware interrupt. To solve problems associated with allowing two like-addressed devices to share a single bus, the computer peripheral interface uses a unique subtractive decoding scheme that allows the processor to selectively access either an internal floppy disk drive controller or a like-addressed peripheral floppy disk drive controller on the shared PCI bus.

REFERENCES:
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patent: 5446910 (1995-08-01), Kennedy et al.
patent: 5475846 (1995-12-01), Moore
patent: 5506997 (1996-04-01), Maguire et al.
patent: 5535400 (1996-07-01), Belmont
patent: 5544334 (1996-08-01), Noll

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