System for communicating through a computer system bus bridge

Details System for communicating through a computer system bus bridge System for communicating through a computer system bus bridge

1997-06-11

2000-04-04

De Cady, Albert

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

710128, G06F 1336

Patent

active

060473495

ABSTRACT:
A PCI/ISA computer system architecture is disclosed in which the ISA legacy circuitry (such as the interrupt request controller, DMA controller, and timer counter unit) is integrated within the system controller coupling the processor and PCI buses. Accordingly, the ISA bridge coupling the PCI and ISA buses is simplified relative to prior art PCI-ISA bridges. A high speed communications channel between the system controller and the ISA bridge is established by first placing an address on the PCI bus which is recognizable only by the system controller and the ISA bridge. Data transfer then occurs within standard PCI protocols, but need only require a subset of the A/D lines. Backwards compatibility is maintained, while system performance is improved and system cost is reduced.

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