1.

Dma Deals With Which Address (physical/virtual Addresses)?

Answer»

DMA deals with Physical addresses.

  • Only when CPU accesses addresses it refers to MMU(MEMORY Management Unit) and MMU converts the Physical address to Virtual address.
  • But, DMA controller is a DEVICE which directly DRIVES the data and address bus during data transfer. So, it is purely Physical address. (It never NEEDS to GO through MMU & Virtual addresses).
  • That is why when writing the device drivers, the physical address of the data buffer has to be assigned to the DMA.

DMA deals with Physical addresses.


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