PCI migration support of ISA adapters

A method and implementing system are provided which includes a PCI host bridge connected to a PCI bus. The PCI slots are applied to a switch array which is controlled by circuitry within the PCI host bridge in the example. The switch array is connected to interrupt control logic which is, in turn, c...

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Bibliographic Details
Main Authors NEAL; DANNY MARVIN, KELLEY; RICHARD ALLEN
Format Patent
LanguageEnglish
Published 27.06.2000
Edition7
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A method and implementing system are provided which includes a PCI host bridge connected to a PCI bus. The PCI slots are applied to a switch array which is controlled by circuitry within the PCI host bridge in the example. The switch array is connected to interrupt control logic which is, in turn, coupled to the PCI host bridge. The methodology in one example uses the Interrupt Pin field in the PCI configuration space currently supported by the PCI Specification to identify an ISA interrupt signal line to which a migrated ISA device needs to be connected. Migrated ISA devices in PCI card connectors are then identified by determining the interrupt information associated with the ISA interrupt signal line identification method used. An interrupt switch array is then used to connect the migrated ISA device interrupt to the desired IRQx signal line and to the interrupt control logic. The switching array provides for a translation of PCI to ISA interrupts for connection to an interrupt controller.
Bibliography:Application Number: US19980094712