38
m
A
A
X
X
4
4
L
L
/
/
A
A
X
X
4
4
L
L
-
-
N
N
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
IDE1 is also known as the primary channel and
make a total of four devices. In order to work tog
IDE2 as the secondary channel. Each channel supports two IDE devices that
ether, the two devices on each channel must be set differently to
Master
and
on
his mot
supports
Slave
mode. Either one can be the hard disk or the CDROM. The setting as master or slave mode depends on the jumper
your IDE device, so please refer to your hard disk and CDROM manual accordingly.
IDE devices. Following table lists the transfer rate of IDE PIO and DMA
bytes.
T
herboard
odes. The
us is 16-bit, which means every transfer is two
Mode
IDE b
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
3MB/s
(1/24
x 2byte = 8.
0ns)
PIO mode 3
30ns
6
180ns
(1/180ns) x 2byte = 11.1MB/s
30ns
4
120ns
(1/120ns) x 2by
MB/s
PIO mode 4
te = 16.6
yte = 4.16MB/
30ns
16
480ns
(1/480ns) x 2b
s
DMA mode 0
DMA mode 1
30ns
5
150ns
(1/150ns) x 2byte = 13.3MB/s
B/s
2.
DMA mode 2
30ns
4
120ns
(1/120ns) x 2byte = 16.6M
ATA 33
30ns
4
120ns
(1/120ns) x 2byte x2 = 33MB/s
ATA 66
30ns
2
60ns
(1/60ns) x 2byte x2 = 66MB/s
ATA100
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
ity,
it is
set
th
evice
to master mode and
follow the suggested
to install your
device. Please refer
to above diagram
To achieve the best
performance of Ultra
DMA 33/66/100 hard
disks, a special
80-wires
IDE cable
for Ultra DMA
better signal qual
recommended to
e far end side d
sequence
new
33/66/100 is required.
