Direct Memory Access (DMA).md (592B)
1 +++ 2 title = 'Direct Memory Access (DMA)' 3 +++ 4 # Direct Memory Access (DMA) 5 A special control unit to manage the transfer of blocks directly between main memory and devices 6 7 does functions normally carried out by processor when accessing main memory 8 9 its operation is under control of an operating system routine, but transfers data without intervention 10 11 to transfer a block of words: 12 13 1. Processor sends to DMA controller: starting address, num of words in block, direction of transfer 14 2. DMA controller performs requested operation 15 3. When complete, informs processor by raising an interrupt