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The 82544 controller supports the following features:
Direct
Integrated IEEE 802.3
Integrated
Full duplex support for
Descriptor ring management architecture optimized to deliver both high performance and
Low power +3.3 V device
IP and TCP/UDP checksum
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
Information on NEC MWA may be found on the NEC EXPRESSBUILDER
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
Controls Wake On LAN via Magic Packet support.