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參數(shù)資料
| 型號： | Alert on LAN ASIC |
| 廠商： | Intel Corp. |
| 英文描述： | System Monitoring Instrumentation Device(系統(tǒng)監(jiān)控指示設(shè)備) |
| 中文描述： | 系統(tǒng)監(jiān)測儀器設(shè)備（系統(tǒng)監(jiān)控指示設(shè)備） |
| 文件頁數(shù)： | 5/36頁 |
| 文件大?。?/td> | 231K |
| 代理商： | ALERT ON LAN ASIC |
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Datasheet
1
Networking Silicon — Alert on LAN* ASIC
1.0
Introduction
The Alert on LAN ASIC is intended to provide system manageability function to a desktop
platform when used in conjunction with the Intel 82558 B-step (82558B) Fast Ethernet Controller.
Together, these two integrated circuits (ICs) provide a management interface between a remote
management console or server and the client system. Additional hardware is required to provide the
Alert on LAN ASIC with system monitoring instrumentation (for example, over-voltage or over-
temperature indications).
The Alert on LAN ASIC is not a stand alone device and requires the 82558B, a 64x16 EEPROM,
environmental ICs, and support software to create a functional management solution. A more
detailed description of the EEPROM and environmental ICs and other external components can be
found in
Section 8.0, “Appendix A: Alert on LAN Supporting Hardware” on page 31
.
1.1
Alert on LAN Overview
The primary function of the Alert on LAN ASIC is to provide a transmit stream to the 82558B,
which transmits alert (“SOS”) packets or heartbeat (“presence”) packets. The Alert on LAN ASIC
is responsible for transmitting these packets when software is unable to (for example, during a low
power state or system failure).
The Alert on LAN ASIC communicates to the system through a System Management Bus (SMB),
which is a subset of the Phillips I
2
C** interface. The SMB typically connects to the PCI-to-ISA/
IDE Xcelerator (PIIX4), which is accessible by the system and through the Basic Input/Output
System (BIOS).
Communication between the Alert on LAN ASIC and the 82558B is through an 8-bit wide parallel
data interface plus supporting control signals. The Alert on LAN ASIC uses this interface to
transfer data for the transmission of packets, alert and heartbeat, to the 82558B.
The Alert on LAN ASIC transfers packets due to either internal or external events. External events
are detected through five dedicated pins of the Alert on LAN ASIC; internal events are generated
by either a set of timers or support software.
The Alert on LAN ASIC contains configuration registers to enable or disable events and store
packet information. Since packets must be Internet Protocol (IP) routeable, the packet headers are
stored in the Alert on LAN ASIC. The Alert on LAN ASIC does not have the resources necessary
to create the correct IP packets and relies on supporting software and the IP stack to supply it with
the appropriate information.
An external EEPROM is used to provide default configuration information to the Alert on LAN
ASIC. It also provides the only method for loading a packet structure and header into the Alert on
LAN ASIC. This allows the Alert on LAN ASIC to power-up into a configured state without the
need for software configuration.
1.2
Management Overview
The Alert on LAN ASIC/82558B management solution is intended to provide system management
capabilities including (but not limited to):
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