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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 ATA33,
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
ATA 33
30ns
ATA 66
30ns
ATA100
20ns
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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ATA66
or
ATA100
IDE devices. Following table lists the transfer rate of IDE PIO and DMA modes. The
Clock
Cycle Time
Data Transfer Rate
Count
20
600ns
(1/600ns) x 2byte = 3.3MB/s
13
383ns
(1/383ns) x 2byte = 5.2MB/s
8
240ns
(1/240ns) x 2byte = 8.3MB/s
6
180ns
(1/180ns) x 2byte = 11.1MB/s
4
120ns
(1/120ns) x 2byte = 16.6MB/s
16
480ns
(1/480ns) x 2byte = 4.16MB/s
5
150ns
(1/150ns) x 2byte = 13.3MB/s
4
120ns
(1/120ns) x 2byte = 16.6MB/s
4
120ns
(1/120ns) x 2byte x2 = 33MB/s
2
60ns
(1/60ns) x 2byte x2 = 66MB/s
2
40ns
(1/40ns) x 2byte x2 = 100MB/s
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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
33/66/100 hard disks, a
special
80-wires
IDE
cable
for
Ultra
DMA
33/66/100 is required.
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