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Why Direct memory access has priority over the CPU when both request a memory transfer?
Wiki User
∙ 13y ago
we can transfer data direct to and from memory without the need of the CPU. The transfer of data between a fast storage device such as magnetic disk and memory is often limited by the speed of the CPU. Removing the CPU from the path and letting the peripheral device manager the memory buses directly would improve the speed of transfer. This transfer technique is called direct memory access(DMA). During DMA transfer, the CPU is idle and has no control of the memory buses. A DMA controller takes over the buses to manage the transfer directly between the I/O device and memory.
With Regards.
Veer Thakur.
Chandigarh.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoIf the CPU had access then the DMA would have to wait a lot since the CPU always needs something from the memory and the DMA requests are not that frequent.
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DMA - Direct Memory Access
What technique is used to transfer data directly from the hard disk to memory.?
DMA - Direct Memory Access
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nBacking Store - fast disk large enough to accommodate copies of all memory images for all users; must provide direct access to these memory images. nRoll out, roll in - swapping variant used for priority based scheduling algorithms; lower priority process is swapped out, so higher priority process can be loaded and executed. nMajor part of swap time is transfer time; total transfer time is directly proportional to the amount of memory swapped. Modified versions of swapping are found on many systems, i.e. UNIX and Microsoft Windows
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the passive entity that is the target of an access request. the active entity that initiates an access request.
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Direct access is designed to give the user of a computer direct access to their internal network over the internet, and is in many ways similar to VPN's.
