User Guide

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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 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.

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 hard disks, a

special 80-wires IDE

cable for Ultra DMA

66/100 is required.

Clock Period

Warning: The specification of the IDE cable is a maximum of 46cm (18 inches);

make sure your cable does not exceed this length.

PIO mode 0

PIO mode 1

PIO mode 2

PIO mode 3

PIO mode 4

DMA mode 0

DMA mode 1

DMA mode 2

UDMA 33

UDMA 66

UDMA100 20ns

30ns

Mode Clock

Count

Cycle Time Data Transfer Rate

(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 x2 = 33MB/s

(1/60ns) x 2byte x2 = 66MB/s

(1/40ns) x 2byte x2 = 100MB/s 40ns

60ns

120ns

150ns

480ns

120ns

180ns

240ns

383ns

600ns 20