Apollo 120 III, 150 III user manual Internal PCI / IDE, IDE Primary Master/Slave PIO

User Manual version 2305

SIS 630 ONCHIP IDE DEVICE

uINTERNAL PCI / IDE

This chipset contains an internal PCI IDE interface with support for two IDE channels.

The choice: Primary, Secondary or Both.

uIDE Primary Master/Slave PIO

The four IDE PIO (Programmed Input / Output) fields let you set a PIO mode (0-4) for each of the four IDE devices that the onboard IDE interface supports. Modes 0 through 4 provide successively increased performance. In Auto mode, the system automatically determines the best mode for each device.

The choice: Auto, Mode 0, Mode 1, Mode 2, Mode 3 or Mode 4.

uPRIMARY MASTER/SLAVE ULTRADMA

UDMA (Ultra DMA) is a DMA data transfer protocol that utilizes ATA commands and the ATA bus to allow DMA commands to transfer data at a maximum burst rate of 33 MB/s. When you select Auto in the four IDE UDMA fields (for each of up to four IDE devices that the internal PCI IDE interface supports), the system automatically determines the optimal data transfer rate for each IDE device.

The choice: Auto or Disabled.

uIDE BURST MODE

Selecting Enabled reduces latency between each drive read/write cycle, but may cause instability in IDE subsystems that cannot support such fast performance. If you are getting disk drive errors, try setting this value to Disabled. This field does not appear when the Internal PCI/IDE field, above, is Disabled.

The choice: Enabled or Disabled.

7-124 APOLLO 120/150 III