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User Manual version 2305
APOLLO 120/150 III
7-124
SIS 630 ONCHIP IDE DEVICE
u INTERNAL PCI / IDE
This chipset contains an internal PCI IDE interface with
support for two IDE channels.
The choice: Primary, Secondary or Both.
u IDE 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.
u PRIMARY 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.
u IDE 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.