Method and apparatus for detecting a resource lock on a PCI bus

Details Method and apparatus for detecting a resource lock on a PCI bus Method and apparatus for detecting a resource lock on a PCI bus

1996-08-09

1998-12-15

An, Meng-Ai T.

395326, 395842, G06F 1300

Patent

active

058505296

ABSTRACT:
A computer system for detecting a resource lock state on a PCI bus includes a DMA controller that transmits a bus access request signal from an I/O expansion device through a bridge device to a bus arbiter, and receives a granted bus access enable signal from the bus arbiter. The computer system further has a circuit for determining whether the PCI bus is in a resource lock state by using a lock signal at a granted bus access enable signal, and a circuit for prohibiting the DMA controller from executing a transaction for DMA transfer, when the PCI bus is in a resource lock state.

REFERENCES:
patent: 5467295 (1995-11-01), Young et al.
patent: 5555383 (1996-09-01), Elazar et al.
patent: 5603050 (1997-02-01), Wolford et al.
patent: 5664197 (1997-09-01), Kardach et al.
"82C37A-5 CHMOS High Performance Programmable DMA Controller", INTEL.RTM. Peripheral Components, 3-33-3-50 (1988).
"Mobile PC/PCI DMA Arbitration and Protocols," Intel Corporation, Apr. 1996, Revision 2.2, pp. 1-27.
PCI Local Bus Specification, PCI Special Interest Group, Revision 2.1 (1995).

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