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M
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3
This motherboard supports Ultra ATA33,
DMA modes. The IDE bus is 16-bit, which means every transfer is two bytes.
Mode
Clock Period
PIO mode 0
30ns
PIO mode 1
30ns
PIO mode 2
30ns
PIO mode 3
30ns
PIO mode 4
30ns
DMA mode 0
30ns
DMA mode 1
30ns
DMA mode 2
30ns
UDMA 33
30ns
UDMA 66
30ns
UDMA100
20ns
Tip: To achieve the best performance of Ultra ATA 66/100 hard
disks, a special 80-wires IDE cable for Ultra ATA 66/100 is
required.
6
L
E
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V
6
L
E
-
V
ATA66
and
ATA100
Clock Count
Cycle Time
20
600ns
13
383ns
8
240ns
6
180ns
4
120ns
16
480ns
5
150ns
4
120ns
4
120ns
2
60ns
2
40ns
IDE devices. Following table lists the transfer rate of IDE PIO and
Data Transfer Rate
(1/600ns) x 2byte = 3.3MB/s
(1/383ns) x 2byte = 5.2MB/s
(1/240ns) x 2byte = 8.3MB/s
(1/180ns) x 2byte = 11.1MB/s
(1/120ns) x 2byte = 16.6MB/s
(1/480ns) x 2byte = 4.16MB/s
(1/150ns) x 2byte = 13.3MB/s
(1/120ns) x 2byte = 16.6MB/s
(1/120ns) x 2byte x2 = 33MB/s
(1/60ns) x 2byte x2 = 66MB/s
(1/40ns) x 2byte x2 = 100MB/s
31
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