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IDE1 is also known as the primary channel and IDE2 as the secondary channel. Each channel supports two IDE devices that
make a total of four devices. In order to work together, the two devices on each channel must be set differently to Master and
Slave mode. Either one can be the hard disk or the CDROM. The setting as master or slave mode depends on the jumper on
your IDE device, so please refer to your hard disk and CDROM manual accordingly.
This motherboard supports ATA66,
modes. The IDE bus is 16-bit, which means every transfer is two bytes.
Mode
Clock Period Clock Count Cycle Time Data Transfer Rate
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
ATA33
30ns
ATA66
30ns
ATA100
20ns
ATA133
15ns
Warning: The specification of the IDE cable is a maximum of 46cm (18 inches);
make sure your cable does not exceed this length.
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ATA100
or
ATA133
IDE devices. Following table lists the transfer rate of IDE PIO and DMA
20
600ns
13
383ns
8
240ns
6
180ns
4
120ns
16
480ns
5
150ns
4
120ns
4
120ns
2
60ns
2
40ns
2
30ns
(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 x 2 = 33MB/s
(1/60ns) x 2byte x 2 = 66MB/s
(1/40ns) x 2byte x 2 = 100MB/s
(1/30ns) x 2byte x 2 = 133MB/s
35
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Tip:
1.
For better signal quality,
it is recommended to set
the far end side device
to
master
mode
and
follow
the
suggested
sequence to install your
new device. Please refer
to above diagra m
2.
To
achieve
the
best
performance
of
Ultra
DMA
66/100/133
hard
disks, a special 80-wires
IDE cable for Ultra DMA
66/100/133 is required.
l
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