User Guide

28
D
D
X
X
P
P
N
N
-
-
U
U
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
A
A
T
T
A
A
1
1
0
0
0
0
S
S
u
u
p
p
p
p
o
o
r
r
t
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d
d
This motherboard supports ATA66 or ATA100 IDE devices. Following table lists the transfer rate of IDE PIO and DMA modes.
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
DMA MODE3-4 (ATA 66) 30ns 2 60ns (1/60ns) x 2byte x2 = 66MB/s
DMA MODE5 (ATA 100) 20ns 2 40ns (1/40ns) x 2byte x2 = 100MB/s