Patent
1998-06-09
1999-02-23
Sheikh, Ayaz R.
395846, G06F 1300
Patent
active
058753516
ABSTRACT:
A distributed direct memory access (DMA) architecture where greater than seven DMA channels are provided and utilized. Alternative methods are disclosed for paging or swapping DMA channels so that more than seven may exist in a computer system, but only seven may be available at a time to remain compatible with conventional DMA controller software. In one method, channels may be assigned identical addresses, with one enabled at one time. In another method, channels are assigned unique addresses but the DMA master addresses only a subset of the total number of channels so that up to seven are available to compatible software at any one time.
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patent: 5619647 (1997-04-01), Jardin
patent: 5687338 (1997-11-01), Boggs
patent: 5752076 (1998-05-01), Munson
Distributed-DMA techniques allow easy migration from the ISA bus to the PCI bus, by David Evoy, VLSI Technology, Inc., EDN Magazine, Nov. 23, 1995, 8 pages.
intel.RTM. 8237A High Performance Programmable DMA Controller (8237A, 8237A-4, 8237A-5); Oct. 1987 (pp. 2-222 -2-258).
PCI, Revision 2.1, A100910-940 (pp. 35-55); Jun. 1, 1995.
DMA Support on the "PCIway", Aug. 2, 1995, Version 5.4, Preliminary, pp. 2-16.
Compaq Computer Corporation
Sheikh Ayaz R.
Wiley David A.
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