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参数资料
| 型号： | Alert on LAN ASIC |
| 厂商： | Intel Corp. |
| 英文描述： | System Monitoring Instrumentation Device(系统监控指示设备) |
| 中文描述： | 系统监测仪器设备（系统监控指示设备） |
| 文件页数： | 11/36页 |
| 文件大小： | 231K |
| 代理商： | ALERT ON LAN ASIC |
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Datasheet
7
Networking Silicon — Alert on LAN* ASIC
All of the above are considered new events because they initiate a new packet transmission and
interrupt any current transmissions.
Section 2.4.9, “New Event Packet Transmissions” on page 9
describes new event occurrences in more detail.
Note:
A heartbeat does not cause a new event. Although it can initiate a packet, it does not interrupt
current packet transmissions. If it does initiate a packet, the Quantum field will be incremented for
that new packet. If the heartbeat occurs within the new event packet transmission window (three
packets including the time period between the three packets), the current heartbeat will be ignored.
The other reason that a heartbeat is not a new event is because it only causes a single packet to be
transmitted, rather than three.
2.4.2
External Events
The external events are level inputs that cause alert packets to be sent by the Alert on LAN ASIC.
The active level (polarity) of the signals is configurable through the Polarity register, which is
written to by the EEPROM and SMB writes. Each hardware event is latched in the Event Status
register after it has occurred, regardless of the Event Mask or SMI Mask registers. To clear the
event and SMI, if enabled, a 1b must be written to the appropriate status register bit.
The Event Mask register selects the events that can cause an alert packet transmission as well as
masking the status bits into the packet payload. The SMI Mask register selects the events that can
cause an SMI event. Both of these registers are loaded by the EEPROM and are configurable
through the SMB interface.
Every time a new event is activated, the Alert on LAN ASIC sends an alert as soon as possible (the
82558B can invoke wait states). At the same time, the retransmission timer starts. At the expiration
of this timer, a second identical packet is sent followed by a third packet after the same timer
interval. Whenever a new event is activated, this sequence begins again. The ASIC does not
continually send alert packets while the level input is active. This helps reduce the amount of
redundant management and network-generated traffic.
Alert packets always take priority over heartbeat packets. If an event occurs, three alert packets are
sent along with the retransmission delays before another heartbeat packet is sent.
The Retransmission Timer starts when the packet is queued to be transmitted. If the packet has not
been transmitted by the time the retransmission timer has expired, the next packet will not be
transmitted. This is highly unlikely to occur; however, it is possible if the 82558B delays the
transmission of the packet. Possible delays may include an EEPROM read or collision back-off.
There are five separate external level events:
1.
Cover Tamper
. This indicates that the cover has been opened or tampered with.
2.
Environmental SMI
. This indicates that the environmental control IC has generated an SMI
event.
3.
BTI Temperature
. This indicates that the environmental control IC has generated an SMI
event.
4.
LAN Leash
. This indicates that the LAN has lost its link. This event signal uses a different
interface than other events. If enabled, the detection of a link that has been down for five to ten
seconds generates an event; however, the Alert on LAN ASIC does not transmit unless the link
is currently valid.
5.
Processor Missing
. This indicates that the processor is not installed.
Although these events are defined, they can be used for any event as long as the corresponding
software can function properly.
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