AOpen AX4BS Pro Online Manual page 40

A X 4 B S P r o / A X
A X 4 B S P r o / A X
IDE1 is also known as a primary channel and IDE2 as 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,
modes. The IDE bus is 16-bit, which means every transfer is two bytes.
Mode Clock Period
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
UDMA 33 30ns
UDMA 66 30ns
UDMA100 20ns
4 B S - V
4 B S - V
ATA66 or ATA100 IDE devices. Following table lists the transfer rate of IDE PIO and DMA
Clock Cycle Time
Count
20 600ns
13 383ns
8 240ns
6 180ns
4 120ns
16 480ns
5 150ns
4 120ns
4 120ns
2 60ns
2 40ns
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
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O n l i n e M a n u a l
O n l i n e M a n u a l