User Guide

M
M
K
K
7
7
3
3
L
L
E
E
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-
N
N
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/
M
M
K
K
7
7
3
3
L
L
E
E
-
-
V
V
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
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u
u
a
a
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This motherboard supports Ultra ATA33, ATA66 and 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
34
Tip: To achieve best performance of Ultra ATA 66/100 har
d
disks, a special 80-wires IDE cable for Ultra ATA 66/100 is
required.