Product guide

22
Chapter Two System Features
SCSI Controller
The embedded Adaptec AIC-7896 dual function SCSI controller provides both Ultra2
(LVDS) wide and Ultra wide SCSI interfaces as two independent PCI functions.
The SCSI bus is terminated on the server board with active terminators that cannot
be disabled. The onboard device must always be at one end of the bus. The device
at the end of the cable must be terminated. LVDS devices generally do not have
termination capabilities. Non-LVDS devices generally are terminated through a
jumper or resistor pack. The SCSI cable included with your server board (or
integrator’s kit) has been modified to include active termination. The cable is
capable of supporting both Ultra-2 and non-Ultra-2 SCSI devices. Proper
termination of the SCSI bus is required for stable operation of SCSI devices. When
attaching any SCSI device to the cable, verify that they are NOT terminated. This is
usually a configurable option using a jumper or terminator block on the device.
Check the documentation that came with your SCSI device to verify this option.
Termination of the SCSI bus is implemented using the active termination on the
server board along with the active termination at the end of the SCSI cable.
IDE Controller
IDE is a 16-bit interface for intelligent disk drives with disk controller electronics
onboard. The PCI/ISA/IDE Accelerator, also known as PIIX4e, is a multifunction
device on the server board that acts as a PCI based Fast IDE controller. The device
controls:
q PIO and IDE DMA/bus master operations
q Mode 4 timings
q Transfer rates up to 33 MBps (Megabytes per second)
q Buffering for PCI/IDE burst transfers
q Master/slave IDE mode
q Up to two devices per channel; two channels, IDE0 and IDE1
An 18-inch maximum length for the IDE cable on each channel: You can connect
an IDE signal cable, up to a maximum of 18-inches, to each IDE connector on the
server mainboard. Each cable can support two devices, one at the end of the cable
and one 6 inches from the end of the cable.
Note