User`s guide

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This motherboard supports Ultra DMA/33 or Ultra DMA/66/100 mode. Following table lists the
transfer rate of IDE PIO and DMA modes. The IDE bus is 16-bit, which means every transfer is two
bytes.
Mode Clock
33MHz PCI
Clock
Count
Cycle Time Data Transfer Rate
PIO mode 0 30ns 20 600ns (1/600ns) x 2byte = 3.3MB/s
PIO mode 1 30ns 13 383ns (1/383ns) x 2byte = 5.2MB/s
PIO mode 2 30ns 8 240ns (1/240ns) x 2byte = 8.3MB/s
PIO mode 3 30ns 6 180ns (1/180ns) x 2byte = 11.1MB/s
PIO mode 4 30ns 4 120ns (1/120ns) x 2byte = 16.6MB/s
DMA mode 0 30ns 16 480ns (1/480ns) x 2byte = 4.16MB/s
DMA mode 1 30ns 5 150ns (1/150ns) x 2byte = 13.3MB/s
DMA mode 2 30ns 4 120ns (1/120ns) x 2byte = 16.6MB/s
UDMA/33 30ns 4 120ns (1/120ns) x 2byte x2 = 33MB/s
UDMA/66 30ns 4 120ns (1/120ns) x 2byte x4 = 66MB/s
69
Open
A
Note: ATA/100 uses both rising edge and falling edge but doubles
UDMA/33
transfer rate. The data transfer rate is 4 times of the PIO
mode 4 or DMA mode 2, 16.6MB/s x4 = 66MB/s. To use ATA/66, you
need special ATA/66 IDE cable.