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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
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
Clock Count Cycle Time Data Transfer Rate
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
32
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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 diagram.
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.
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