DMA stands for "Direct Memory
Access" and is a method of transferring data from the computer's RAM to
another part of the computer without processing it using the CPU. While most data that is input or
output from your computer is processed by the CPU, some data does not require
processing, or can be processed by another device.
In these situations, DMA can save processing time and
is a more efficient way to move data from the computer's memory to other devices. In order for devices
to use direct memory access, they must be assigned to a DMA channel. Each type
of port on a computer has a set of DMA channels that can be assigned to each
connected device. For example, a PCI controller and a hard drive controller
each have their own set of DMA channels.
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