System for automatically switching to DMA data transfer mode to load and unload data frames when there are excessive data frames in memory buffer
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United States of America Patent
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Oct 13, 1998
Issued Date -
N/A
app pub date -
Mar 14, 1997
filing date -
Nov 21, 1994
priority date (Note) -
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Abstract
A network controller, which allows data frames received to be held in an internal memory buffer, has the capability to selectively switch between a DMA mode of data transfer and a non-DMA mode of data transfer to move data frames from the internal memory buffer to a desired location. When the overflow of the memory buffer is anticipated, a DMA controller is automatically engaged to move the data frames to a system memory to prevent the received frames from being discarded. An auto-DMA decision logic engages the DMA controller based on factors such as the number of data frames accumulated in the memory buffer, remaining capacity of the memory buffer, frame loading and unloading rates, and time interval during which data frames have been received without completely unloading the memory buffer.
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