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.

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NEC 140Rc-4 manual System Board Management Controller BMC