System Overview 1-21
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 and
mouse.
The system includes a single channel enhanced IDE 32 bit interface. The IDE controller
provides support for the internally mounted CD-ROM and super floppy disk drive.
The device controls:
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PIO and DMA transfer modes
!
Mode 4 timings
!
Transfer rates up to 33 MB/s
!
Buffering for PCI/IDE burst transfers.
Network Controller
Each PCI CRU includes a 10BASE-T/100BASE-TX network controller based on the
Intel 82559 Fast Ethernet Network Interface ASIC. 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 (direct drive of bus), 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 and 100 Mbps networks, capable of full or half
duplex, with back-to-back transmit at 100 Mbps
!
Support for Wake On LAN.
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