what is the difference between DMA and CentralDMA

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bibith

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can any one explain what is the difference between DMA and Central DMA.
 

bibith said:
can any one explain what is the difference between DMA and Central DMA.
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In the PC world, I believe "central" DMA refers to a single DMA controller chip (8237 I seem to recall) that is used for all DMA transfers on the bus not performed by the CPU.

In a PCI system, due to the bandwidth of the various devices and level of IC integration, DMA controllers are distributed on devices as needed.
 

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