2-20 General Description
The 82544 controller supports the following features:
Direct 32/64-bit, 33/66-MHz interface to the PCI bus
Integrated IEEE 802.3 1000BASE-T, 100BASE-TX, and 10BASE-T
Integrated third-generation MAC and proven IEEE 803.3ab compatible PHY
Full duplex support for 10-Mbps, 100-Mbps, and 1000 Mpbs operation
Descriptor ring management architecture optimized to deliver both high performance and
PCI/PCI-X bus efficiency
Low power +3.3 V device
IP and TCP/UDP checksum off-loading
System Board Management Controller (BMC)
Server management is concentrated in the System Board Management Controller (BMC). The
BMC and associated circuitry are powered from a 5Vdc standby voltage, which remains active
when system power is switched off, but the ac power source is still on and connected.
The BMC supports the NEC Management Workstation Application (NEC MWA), which allows
remote server management via a modem or direct connection to a manager system. Events
monitored by the manager system include over-temperature and over-voltage conditions, fan failure,
or chassis intrusion.
Information on NEC MWA may be found on the NEC EXPRESSBUILDER CD-ROM included
with your server.
One major function of the BMC is to autonomously monitor system management events, and log
their occurrence in the nonvolatile System Event Log (SEL). The events being monitored include
overtemperature and overvoltage conditions, fan failure, or chassis intrusion. To enable accurate
monitoring, the BMC maintains the nonvolatile Sensor Data Record (SDR), from which sensor
information can be retrieved. The BMC provides an ISA host interface to SDR sensor information,
so that software running on the server can poll and retrieve the server's current status.
The BMC performs the following:
Monitors server board temperature and voltage
Monitors processor presence and controls Fault Resilient Boot (FRB)
Detects and indicates fan failure
Manages the SEL interface
Manages the SDR Repository interface
Monitors the SDR/SEL timestamp clock
Monitors the system management watchdog timer
Monitors the periodic SMI timer
Monitors the event receiver
Controls secure mode, including video blanking, diskette write-protect monitoring, and
front panel lock/unlock initiation
Controls Wake On LAN via Magic Packet support.