Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Patent
1997-01-02
1999-09-14
Sheikh, Ayaz R.
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
710107, G06F 1300
Patent
active
059516674
ABSTRACT:
Modern personal computers often have several internal buses. An integrated expansion bus bridge is disclosed that couples to a fast main computer bus and couples several different expansion buses to the fast main computer bus. In one personal computer embodiment, the fast main computer bus bus is the Peripheral Component Interconnect (PCI) Bus. The expansion bus bridge obains control of the PCI bus and then arbitrates the bus control among several entities requesting access to the PCI bus. In one personal computer embodiments, the entities requesting access to the PCI bus include a Universal Serial Bus (USB) controller, an Industry Standard Architecture (ISA) bus controller, and an Integrated Drive Electronics controller. To prevent deadlock situations, the integrated expansion bus controller passively releases the PCI Bus when an ISA Direct Memory Access (DMA) operation is in progress. A passive release of the PCI bridge prevents CPU postings to or behind the expansion bus bridge from occurring. If no ISA DMA operation is in progress, then the expansion bus bridge may actively release the PCI bus.
REFERENCES:
patent: 5555383 (1996-09-01), Elazar et al.
patent: 5675794 (1997-10-01), Meredith
patent: 5748911 (1998-05-01), Maguire et al.
Intel Corporation
Sheikh Ayaz R.
Wiley David A.
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