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System Overview 1-27
BIOS
The BIOS and Setup Utility are located in the Flash EPROM on the CPU board and
include support for system setup and legacy device configuration. A number of security,
reliability, and management features also have been incorporated to meet vital server
needs.
USB/IDE Controller
The ServerWorks ROSB chip supports the USB and IDE controllers. The I/O panel
board provides the connector interface for two USB ports that support the
keyboard/mouse and floppy diskette drive.
The system includes a single channel enhanced IDE 32 bit interface. The IDE controller
provides support for the internally mounted CD-ROM.
The device controls:
! PIO and DMA transfer modes
! Mode 4 timings
! Transfer rates up to 33 MB/s
! Buffering for PCI/IDE burst transfers.
Network Controllers
Each PCI CRU includes a 10BASE-T/100BASE network controller and a 10BASE-
T/100BASE-TX/1000BASE-T network controller. As a PCI bus master, the controller
can burst data at up to 132 MB/sec. The controller contains two receive and transmit
FIFO buffers that prevent data overruns or underruns while waiting for access to the
PCI bus. The controller has the following:
! 32-bit PCI bus master interface for 10BASE-T/100BASE and a 64-bit PCI bus
master interface for a 10BASE-T/100BASE-TX/1000BASE, compatible with
PCI Bus Specification, Revision 2.1
! Chained memory structure with improved dynamic transmit chaining for
enhanced performance
! Programmable transmit threshold for improved bus utilization
! Early receive interrupt for concurrent processing of receive data
! On-chip counters for network management
! Autodetect and autoswitching for 10 or 100 Mbps network speeds
! Support for both 10 Mbps, 100 Mbps and 1000Mbps networks, capable of full or
half duplex, with back-to-back transmit at 100 Mbps
! Support for Wake On LAN.