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Ultra Direct Memory Access (UDMA) is just an advanced, updated version of Direct Memory Access. It introduced features such as double transition clocking (similar to DDR used with memory) and CRC checks.

DMA offered speeds up to 16.7 MB/s whereas UDMA offered speeds up to 133 MB/s per channel (UDMA Mode 6).

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DMA (Direct Memory Access) allows devices to transfer data directly to and from memory without involving the CPU. UDMA (Ultra DMA) is an improvement over DMA that increases data transfer speeds by using faster transfer modes and protocols.

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10mo ago
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Q: What is the difference between DMA and UDMA?
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