35
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K
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3
3
3
3
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M
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3
3
3
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I
I
(
(
A
A
)
)
O
O
n
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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
ATA100
IDE devices. Following table lists the transfer rate of IDE PIO and DMA 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
20
600ns
(1/600ns) x 2byte = 3.3MB/s
PIO mode 1
30ns
13
383ns
(1/383ns) x 2byte = 5.2MB/s
PIO mode 2
30ns
8
240ns
(1/240ns) x 2byte = 8.3MB/s
PIO mode 3
30ns
6
180ns
(1/180ns) x 2byte = 11.1MB/s
PIO mode 4
30ns
4
120ns
(1/120ns) x 2byte = 16.6MB/s
DMA mode 0
30ns
16
480ns
(1/480ns) x 2byte = 4.16MB/s
DMA mode 1
30ns
5
150ns
(1/150ns) x 2byte = 13.3MB/s
DMA mode 2
30ns
4
120ns
(1/120ns) x 2byte = 16.6MB/s
UDMA 33
30ns
4
120ns
(1/120ns) x 2byte x2 = 33MB/s
UDMA 66
30ns
2
60ns
(1/60ns) x 2byte x2 = 66MB/s
UDMA100
20ns
2
40ns
(1/40ns) x 2byte x2 = 100MB/s
Warning:
The specification of the IDE cable is a maximum of 46cm (18 inches);
make sure your cable does not exceed this length.
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.
