AOpen 1AK79G-V Online Manual page 35

A K 7 9 G - V / A K 7 9
A K 7 9 G - V / A K 7 9
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 ATA66,
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
PIO mode 1 30ns
PIO mode 2 30ns
PIO mode 3 30ns
PIO mode 4 30ns
DMA mode 0 30ns
DMA mode 1 30ns
DMA mode 2 30ns
ATA33 30ns
ATA66 30ns
ATA100 20ns
ATA133 15ns
Warning: The specification of the IDE cable is a maximum of 46cm (18 inches);
make sure your cable does not exceed this length.
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ATA100 or ATA133
20 600ns
13 383ns
8 240ns
6 180ns
4 120ns
16 480ns
5 150ns
4 120ns
4 120ns
2 60ns
2 40ns
2 30ns
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9 4 / A K 7 9 G - 1 3 9 4
DE devices. Following table lists the transfer rate of IDE PIO and DMA
(1/600ns) x 2byte = 3.3MB/s
(1/383ns) x 2byte = 5.2MB/s
(1/240ns) x 2byte = 8.3MB/s
(1/180ns) x 2byte = 11.1MB/s
(1/120ns) x 2byte = 16.6MB/s
(1/480ns) x 2byte = 4.16MB/s
(1/150ns) x 2byte = 13.3MB/s
(1/120ns) x 2byte = 16.6MB/s
(1/120ns) x 2byte x 2 = 33MB/s
(1/60ns) x 2byte x 2 = 66MB/s
(1/40ns) x 2byte x 2 = 100MB/s
(1/30ns) x 2byte x 2 = 133MB/s
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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 66/100/133 hard
disks, a special 80-wires
IDE cable for Ultra DMA
66/100/133 is required.
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