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Chapter 1 Server Description
SCSI Controllers
The system board includes two wide/fast-20 SCSI controller chips
integrated as PCI bus masters. These controllers support:
• An 8-bit (narrow SCSI) data path at a data transfer rate of 20 MB/sec.
• A 16-bit (wide SCSI) data path at a data transfer rate of 40 MB/sec.
• Data transfer rates of 133 MB/sec as PCI bus masters.
• The connection of a maximum of seven 8-bit narrow SCSI devices to
each controller.
• The connection of a mixture of up to fifteen 16-bit wide and/or 8-bit
narrow SCSI devices to each controller (maximum of seven 8-bit narrow
devices).
The system board also includes a narrow SCSI controller integrated as a PCI
bus master. You can connect a maximum of seven narrow SCSI devices to
this controller.
The SCSI controllers provide active negation outputs, controls for external
differential transceivers, and a disk activity output. Active negation outputs
reduce the chance of data errors by actively driving both polarities of the
SCSI bus and avoiding indeterminate voltage levels and common-mode
noise on long cable runs. The SCSI output drivers can directly drive a
48 milliampere (mA), single-ended SCSI bus with no additional drivers.
IDE Controller
The PIIX4 multifunction device on the system board acts as a PCI-based Fast
IDE controller that supports
• PIO and IDE DMA/bus master operations
• Mode 4 timings
• Transfer rates up to 32 MB/sec
• Buffering for PCI/IDE burst transfers
• Master/slave IDE mode