AOpen AX4PER Spezifikationen PDF herunterladen (Seite 34)

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.

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

ATA 33 30ns 4 120ns (1/120ns) x 2byte x2 = 33MB/s

ATA 66 30ns 2 60ns (1/60ns) x 2byte x2 = 66MB/s

ATA100 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.

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 diagra

2. To achieve the best

performance of Ultra

DMA 33/66/100 hard

disks, a special 80-wires

IDE cable for Ultra DMA

33/66/100 is re

uired.

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AOpen AX4PER Spezifikationen Seite 34