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What (who) is Ultra Direct Memory Access - definition
SET OF STANDARDS FOR DIRECT MEMORY ACCESS (DMA) DATA TRANSFER
UltraDMA; Ultra DMA; Ultra-DMA; Ultra DMA 33; Ultra ATA/33; Ultra ATA/66; Ultra ATA/100; Ultra ATA/133; UltraDMA33; UDMA66; UDMA100; UDMA133; Ultra Direct Memory Access
Ultra DMA
Direct Memory Access
![integrated circuits]] below the middle of the image are the DMA controller (l.) and - unusual - an extra dedicated DMA controller (r.) for the [[magneto-optical disc]] used instead of a [[hard disk drive]] in the first series of this computer model.](https://commons.wikimedia.org/wiki/Special:FilePath/NeXTcube motherboard.jpg?width=200 "integrated circuits]] below the middle of the image are the DMA controller (l.) and - unusual - an extra dedicated DMA controller (r.) for the [[magneto-optical disc]] used instead of a [[hard disk drive]] in the first series of this computer model.")
FEATURE OF COMPUTER SYSTEMS
Direct Memory Access; DMA controller; DMA engine; DMA channel; Intel Data Direct I/O; Intel DDIO; Data Direct I/O; DDIO; DMA transfer; Third-party DMA; Linked Direct Memory Access; Linked direct memory access; Linked DMA; Programmable DMA controller; Multiplexed DMA; Multiplexed direct memory access; DMA request; DRQ (DMA); DRQ (direct memory access); Burst mode DMA; Burst mode direct memory access; DMA burst; Direct memory access burst; Cycle steal DMA; Cycle steal direct memory access; Cycle stealing DMA; Cycle stealing direct memory access; Interleaved DMA; Interleaved direct memory access
<architecture> (DMA) A facility of some architectures which
allows a peripheral to read and write memory without
intervention by the CPU. DMA is a limited form of {bus
master}ing.
(1996-08-23)
Direct memory access
FEATURE OF COMPUTER SYSTEMS
Direct Memory Access; DMA controller; DMA engine; DMA channel; Intel Data Direct I/O; Intel DDIO; Data Direct I/O; DDIO; DMA transfer; Third-party DMA; Linked Direct Memory Access; Linked direct memory access; Linked DMA; Programmable DMA controller; Multiplexed DMA; Multiplexed direct memory access; DMA request; DRQ (DMA); DRQ (direct memory access); Burst mode DMA; Burst mode direct memory access; DMA burst; Direct memory access burst; Cycle steal DMA; Cycle steal direct memory access; Cycle stealing DMA; Cycle stealing direct memory access; Interleaved DMA; Interleaved direct memory access
Direct memory access (DMA) is a feature of computer systems and allows certain hardware subsystems to access main system memory independently of the central processing unit (CPU).
Wikipedia
UDMA
The Ultra DMA (Ultra Direct Memory Access, UDMA) modes were the fastest method used to transfer data through the ATA hard disk interface, usually between the computer and an ATA device. UDMA succeeded Single/Multiword DMA as the interface of choice between ATA devices and the computer. There are eight different UDMA modes, ranging from 0 to 6 for ATA (0 to 7 for CompactFlash), each with its own timing.
Modes faster than UDMA mode 2 require an 80-conductor cable to reduce data settling times, lower impedance and reduce crosstalk.
