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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,
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
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
Clock
Cycle Time
Count
20
600ns
13
383ns
8
240ns
6
180ns
4
120ns
16
480ns
5
150ns
4
120ns
4
120ns
2
60ns
2
40ns
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
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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 hard disks,
a special 80-wires IDE
cable
for
Ultra
DMA
66/100 is required.
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