Unformatted text preview: Should DMA access to main memory be given higher priority than processor access
to main memory? What is the purpose and technique of DMA logic?
Direct memory access or DMA is a method of transferring data from the computer's
RAM to another part of the computer without processing it through the CPU. I believe the DMA
access to main memory should be given higher priority because it allows the CPU to run more
efficiently. For instance say a sound card needs access data stored on the computer's RAM, but
since the sound card can process the data itself it can use DMA to bypass the CPU. The purpose
of DMA is to enable certain hardware subsystems within the computer access to the systems
memory independently outside of the CPU. When transferring data to devices DMA becomes
very useful because it allows the CPU to perform other functions while the transfer is in
progress. In order for devices to use DMA devices must support direct memory access and they
must also be assigned a DMA channel.
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