Method and apparatus for avoiding erroneous abort occurrences in

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395306, 395308, G06F 1300

Patent

active

057940002

ABSTRACT:
After a PCI device has commenced a transaction on an external PCI bus to access a PCI device on an internal PCI bus, an external PCI bus bridge implemented in a DS-PCI/ISA bridge device, connected to the internal PCI bus and the external PCI bus, activates a dummy device selection signal (DEVSEL#) on the external PCI bus in advance. This dummy DEVSEL# is automatically activated, without waiting for a response from the PCI device on internal PCI bus specified by the transaction. If external PCI bus bridge does not receive the response from the PCI device on the internal PCI bus, external PCI bus bridge activates a stop signal (STOP#) on the external PCI bus and the transaction is normally concluded.

REFERENCES:
patent: 5568621 (1996-10-01), Wooten
patent: 5621900 (1997-04-01), Lane et al.
patent: 5649175 (1997-07-01), Kanekal et al.
"Mobile PC/PCI DMA Arbitration and Protocols," Intel Corporation, Apr., 1996, Revision 2.2, pp. 1-27.
Intel Article, "Peripheral Components," pp. 3-33 through 3-50, (1993).
PCI Local Bus Specification, PCI Special Intrest Group, Revision 2.1 (1995).
PCI Local Bus Specification, PCI Special Intrest Group, Revision 2.0 (1995) .

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