DMA doorbell
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 11, 2004
Issued Date -
N/A
app pub date -
May 31, 2001
filing date -
Jun 2, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of direct memory access (DMA) includes receiving a first notification at a DMA engine that a first list of descriptors has been prepared, each of the descriptors in the list including an instruction for execution by the DMA engine and a link to a succeeding one of the descriptors, except for a final descriptor in the list, which has a null link. The DMA engine reads and executes the descriptors in the first list. When the DMA engine receives a second notification that a second list of the descriptors has been prepared, it rereads at least a part of the final descriptor in the first list to determine a changed value of the link, indicating a first descriptor in the second list. It then reads and executes the descriptors in the second list responsive to the changed value of the link.
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