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| 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： | 12/36页 |
| 文件大小： | 231K |
| 代理商： | ALERT ON LAN ASIC |
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Alert on LAN* ASIC — Networking Silicon
8
Datasheet
2.4.3
Event 1, Sticky Latch Clearing Mechanism
The Event_1 input signal to the Alert on LAN ASIC is designed to work with an event that is stored
in a sticky latch. This event can be configured to clear the sticky latch by driving the opposite
polarity on the Event_1 pin. If configured, this will occur when the Event Status register for
Event_1 is cleared by writing a 1b to this bit. The Alert on LAN ASIC will drive the Event_1 signal
for a minimum of 20 ms, allowing plenty of time for the sticky latch to clear.
Section 8.0,
“Appendix A: Alert on LAN Supporting Hardware” on page 31
describes the sticky latch in more
detail.
With the exception of the sticky latch clearing mechanism, the Event 1 input behaves similar to the
other events. To enable the clearing mechanism of the Event 1 input, the POL_CLREV1 bit of the
Polarity register must be set. If it is desired not to use a sticky latch on Event 1, the clearing
mechanism can be disabled by clearing the POL_CLEV1 bit.
2.4.4
Event 4, Link Detect and Packet Transmission Interrupt
The Event 4 input is designed for use with the Link status output from the 82558B. There are two
special enable functions available with this event.
First is the method of detecting a lost link. If configured, the Alert on LAN ASIC will only cause
an Event 4 in the Event Status register if it detects an inactive link (based on polarity setting) for
two consecutive timer ticks separated by 5.4 seconds. The window of time that the event will detect
link loss is between 5.4 through 10.8 seconds since the “tick time” and “link loss” events are not
synchronous to each other. This feature is required to prevent events on PHY resets and 82558B
resets, which should produce an invalid link for approximately 3 seconds.
The second feature of the Event_4 input signal is its ability to cancel or disable packet
transmissions across the TCO interface whenever the Event_4 pin is active. An active event on
Event_4 indicates that link is down, which will obviously prevent packet transmission on the
network, even though the TCO transaction may be successful. Any packet currently being
transmitted will be interrupted and retransmission will occur when link returns.
The above two features cause the Event_4 input to cause the Alert on LAN ASIC to behave
differently than it would for other events. In order to activate these features, the POL_LNKEV4 bit
in the Polarity register must be set. If it is desired not to use these features, this bit must be disabled.
Since link is always lost when power is completely off (G3 state), this event is preset in the Event
Status register, causing a new event (if the Event Mask is set appropriately) when the Alert on LAN
ASIC is powered up.
Note:
A software reset will not preset or clear this bit. If this feature is not desired, then the Event_4
Status bit can be cleared before the mask is enabled.
2.4.5
Watchdog Event
The Watchdog event is similar to other events, except that it is caused by an internal timer expiring.
The Watchdog event can be used to notify the network console when the monitored machine hangs
during boot-up. For example, the timer can be set and enabled upon initial power-up. If the system
reaches a specified point during boot-up, BIOS can disable the Watchdog Timer, preventing a
Watchdog event. If the system hangs before this point in boot-up is reached, the Watchdog Timer
will time-out and notify the network console.
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