SEL Troubleshooting Guide

System Event Log Troubleshooting Guide for Intel
®
S5500/S3420 Series Server Boards Cooling Subsystem
Revision 1.1 Intel order number G74211-002 35
5.2.2 Thermal Margin Sensors
Margin sensors are also linear sensors but typically report a negative value. This is not an actual temperature, but in fact an offset to a critical
temperature. Example sensors are Processor Thermal Margin, Memory Thermal Margin, and IOH Thermal margin. Values reported should be
seen as number of degrees below a critical temperature for the particular component.
Table 36: Thermal Margin Sensors Typical Characteristics
Byte
Field
Description
11
Sensor Type
01h = Temperature
12
Sensor Number
See Table 38
13
Event Direction and
Event Type
[7] Event direction
0b = Assertion Event
1b = Deassertion Event
[6:0] Event Type = 01h (Threshold)
14
Event Data 1
[7:6] – 01b = Trigger reading in Event Data 2
[5:4] – 01b = Trigger threshold in Event Data 3
[3:0] – Event Triggers as described in Table 37
15
Event Data 2
Reading that triggered event
16
Event Data 3
Threshold value that triggered event
Table 37: Thermal Margin Sensors Event Triggers – Description
Event Trigger
Assertion
Severity
Deassert
Severity
Description
Hex
Description
07h
Upper non-critical
going high
Degraded
OK
The thermal margin has gone over its upper non-critical threshold.
09h
Upper critical
going high
non-fatal
Degraded
The thermal margin has gone over its upper critical threshold.