System for requesting access to DMA channel having address not i

Details System for requesting access to DMA channel having address not i System for requesting access to DMA channel having address not i

1996-04-26

1998-06-09

Lee, Thomas C.

G06F 1540

Patent

active

057650241

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 of the total number of channels so that up to seven are available to compatible software at any one time.

REFERENCES:
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patent: 5598526 (1997-01-01), Daniel
patent: 5619647 (1997-04-01), Jardin
patent: 5687338 (1997-11-01), Boggs
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.

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