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- Direct_memory_access abstract "Direct memory access (DMA) is a feature of modern computers that allows certain hardware subsystems within the computer to access system memory independently of the central processing unit (CPU).Without DMA, when the CPU is using programmed input/output, it is typically fully occupied for the entire duration of the read or write operation, and is thus unavailable to perform other work. With DMA, the CPU initiates the transfer, does other operations while the transfer is in progress, and receives an interrupt from the DMA controller when the operation is done. This feature is useful any time the CPU cannot keep up with the rate of data transfer, or where the CPU needs to perform useful work while waiting for a relatively slow I/O data transfer. Many hardware systems use DMA, including disk drive controllers, graphics cards, network cards and sound cards. DMA is also used for intra-chip data transfer in multi-core processors. Computers that have DMA channels can transfer data to and from devices with much less CPU overhead than computers without DMA channels. Similarly, a processing element inside a multi-core processor can transfer data to and from its local memory without occupying its processor time, allowing computation and data transfer to proceed in parallel.DMA can also be used for "memory to memory" copying or moving of data within memory. DMA can offload expensive memory operations, such as large copies or scatter-gather operations, from the CPU to a dedicated DMA engine. An implementation example is the I/O Acceleration Technology.".
- Direct_memory_access wikiPageExternalLink DMAFundamentals.pdf.
- Direct_memory_access wikiPageExternalLink dma_interrupt_handling.htm.
- Direct_memory_access wikiPageExternalLink ch15.pdf.
- Direct_memory_access wikiPageExternalLink modesDMA-c.html.
- Direct_memory_access wikiPageExternalLink ch13.html.
- Direct_memory_access wikiPageID "57717".
- Direct_memory_access wikiPageRevisionID "605126664".
- Direct_memory_access hasPhotoCollection Direct_memory_access.
- Direct_memory_access subject Category:Computer_memory.
- Direct_memory_access subject Category:Computer_storage_buses.
- Direct_memory_access subject Category:Motherboard.
- Direct_memory_access type Artifact100021939.
- Direct_memory_access type Bus102924116.
- Direct_memory_access type ComputerStorageBuses.
- Direct_memory_access type Conveyance103100490.
- Direct_memory_access type Instrumentality103575240.
- Direct_memory_access type Object100002684.
- Direct_memory_access type PhysicalEntity100001930.
- Direct_memory_access type PublicTransport104019101.
- Direct_memory_access type Whole100003553.
- Direct_memory_access comment "Direct memory access (DMA) is a feature of modern computers that allows certain hardware subsystems within the computer to access system memory independently of the central processing unit (CPU).Without DMA, when the CPU is using programmed input/output, it is typically fully occupied for the entire duration of the read or write operation, and is thus unavailable to perform other work.".
- Direct_memory_access label "Acceso directo a memoria".
- Direct_memory_access label "Accès direct à la mémoire".
- Direct_memory_access label "Acesso direto à memória".
- Direct_memory_access label "Direct Memory Access".
- Direct_memory_access label "Direct Memory Access".
- Direct_memory_access label "Direct Memory Access".
- Direct_memory_access label "Direct Memory Access".
- Direct_memory_access label "Direct memory access".
- Direct_memory_access label "Speicherdirektzugriff".
- Direct_memory_access label "Прямой доступ к памяти".
- Direct_memory_access label "直接記憶體存取".
- Direct_memory_access sameAs DMA.
- Direct_memory_access sameAs Speicherdirektzugriff.
- Direct_memory_access sameAs Άμεση_πρόσβαση_μνήμης.
- Direct_memory_access sameAs Acceso_directo_a_memoria.
- Direct_memory_access sameAs Accès_direct_à_la_mémoire.
- Direct_memory_access sameAs Direct_Memory_Access.
- Direct_memory_access sameAs Direct_Memory_Access.
- Direct_memory_access sameAs 직접_메모리_접근.
- Direct_memory_access sameAs Direct_Memory_Access.
- Direct_memory_access sameAs Direct_Memory_Access.
- Direct_memory_access sameAs Acesso_direto_à_memória.
- Direct_memory_access sameAs m.0fv00.
- Direct_memory_access sameAs Q210813.
- Direct_memory_access sameAs Q210813.
- Direct_memory_access sameAs Direct_memory_access.
- Direct_memory_access wasDerivedFrom Direct_memory_access?oldid=605126664.
- Direct_memory_access isPrimaryTopicOf Direct_memory_access.