System and method for DMA transfer of data in scatter/gather mode
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United States of America Patent
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Jul 24, 2007
Grant Date -
Feb 3, 2005
app pub date -
Jul 26, 2004
filing date -
Jul 31, 2003
priority date (Note) -
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Abstract
A method and system for DMA transfer of data in scatter/gather mode. A table of buffer descriptors may be used to determine the next buffer to be used when a current buffer storing data that has been transferred or will be transferred and may be used in automatic buffer switching, which does not require processor intervention. Entries in the table of buffer descriptors are entered programmatically. The method and system also provide for hardware writing to table of packet descriptors which describes location and size of incoming data and can indicate whether a packet of data straddles two or more buffers, thus decoupling packet sizes from buffer sizes.
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