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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： | 24/36页 |
| 文件大小： | 231K |
| 代理商： | ALERT ON LAN ASIC |
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Alert on LAN* ASIC — Networking Silicon
20
Datasheet
4.7
Register 5h; Watchdog Status Byte
The Watchdog Status Byte register is used to provide more watchdog information to the packet
recipient. It provides a means of identifying the cause of the watchdog event (such as OS hang,
failed boot, etc.). This byte is transmitted with each packet. Note that some software
implementations may use this byte as additional information for a software event. This requires that
the watchdog event is disabled (masked) during these transmissions since this byte is designated for
watchdog data when the watchdog event bit is set in the Event Status register.
4.8
Register 6h; Watchdog Timer
The Watchdog Timer register is used to enable and configure the time-out value of the Watchdog
Timer. The watchdog time-out value can only be written to when the timer is disabled. However,
the value can be written and the timer enabled in a single SMB write.
The timer begins counting down from the value received during a write to the register. When the
timer reaches zero, a new event is caused and the timer begins counting down again. Any write to
this register while it is enabled will reload the time-out value. A read from the register will result in
the current value of the timer.
Note:
It is not recommended to set the time-out value to 00h. Although an event will not be caused
immediately, one will be caused at the first incident if the timer is loaded with a nonzero value and
enabled with one SMB write.
4.9
Register 7h; Heartbeat Timer
The Heartbeat Timer register is used to enable and configure the time-out value of the Heartbeat
Timer. The heartbeat time-out value can only be written when the timer is disabled. However, the
value can be written and the timer enabled in a single SMB write.
Bits
Name
Type
Name and Description
Default
7:0
WDG_DAT
R/W
Watchdog Status.
This register is byte-wide and
indicates the status for transmitted SOS packets on
Watchdog Timer expiration.
EE(40h)
Bits
Name
Type
Name and Description
Default
7:1
WDG_VAL
R/W
Watchdog Timer Value.
This value loads in 43-second
resolution with a range from 43 seconds to 92 minutes.
It can only be written to while the timer is disabled.
This timer has an accuracy of its value minus one tick,
where one tick is equal to 43 seconds.
EE(0000001b)
0
WDG_ENA
R/W
Timer Enable.
1 = Enable/Reset counter
0 = Disable counter
EE(0)
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