In today's world, UDMA has become a topic of relevance and interest for people from different fields and profiles. Whether they are researchers, professionals, students or simply curious individuals, UDMA has captured attention and generated debate in different spaces. From its impact on society to its global implications, UDMA has proven to be a topic that deserves to be explored and analyzed in depth. In this article, we will delve into the different dimensions of UDMA to understand its importance and its repercussions on our reality.
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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.
Mode | Number | Also called | Maximum transfer rate (MB/s) |
Minimum cycle time |
Defining standard |
---|---|---|---|---|---|
Ultra DMA | 0 | 16.7 | 120 ns | ATA-4 | |
1 | 25.0 | 80 ns | ATA-4 | ||
2 | Ultra ATA/33 | 33.3 | 60 ns | ATA-4 | |
3 | 44.4 | 45 ns | ATA-5 | ||
4 | Ultra ATA/66 | 66.7 | 30 ns | ATA-5 | |
5 | Ultra ATA/100 | 100 | 20 ns | ATA-6 | |
6 | Ultra ATA/133 | 133 | 15 ns | ATA-7 | |
7 | Ultra ATA/167 | 167 | 12 ns | CompactFlash 6.0 |