F
F
o
o
r
r
t
t
r
r
e
e
s
s
s
s
7
7
7
7
0
0
0
0
/
/
7
7
9
9
0
0
0
0
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
This motherboard supports
ATA33
,
ATA66
or
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.
66
Open
A
