System for requesting access to DMA channel having address not in DMA registers by replacing address of DMA register with address of requested DMA channel
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United States of America Patent
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Feb 23, 1999
Issued Date -
N/A
app pub date -
Jun 9, 1998
filing date -
Dec 11, 1995
priority date (Note) -
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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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