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AT8902M
Table 4-3:
AT8902M sensors (continued)
IPMI Sensor Name
Ver change
Table 4-4:
Additional AT8902M sensors (Mezzanine)
IPMI Sensor Name
Temp Mezz. Area
Vcc 1.25v Mezz.
Vcc 2.5v Mezz.
Vcc 3.3v Mezz.
Vcc 12v Mezz.
4.4.1.1
IPMB Link Sensor
The AT8902M provides two IPMB links to increase communication reliability to the shelf man-
ager and other IPM devices on the IPMB. These IPMB links work together for increased
throughput where both busses are actively used for communication at any time. A request
might be received over IPMB Bus A, and the response is sent over IPMB Bus B. Any requests
that time out are retried on the redundant IPMB bus. In the event of any link state change, the
events are written to the AT8902M SEL. The IPMC monitors the bus for any link failure and iso-
lates itself from the bus if it detects that it is causing errors on the bus. Events are sent to signal
the failure of a bus or, conversely, the recovery of a bus.
4.4.1.2
FRU Hot Swap
The hot swap event message conveys the current state of the FRU, the previous state, and a
cause of the state change as can be determined by the IPMC. Refer to PICMG 3.0 Specifica-
tions for further details on the hot swap state.
4.4.1.3
Fabric Presence Sensor
The FPS indicates if an optional Extension Fabric Mezzanine is present.
4.4.1.4
CPU Status
The CPU Status is set if the PPC experiences a machine check error.
4.4.1.5
POSTCODE
The IPMC has access to the POSTCODE registers in the CPLD. Refer to chapter 4.3.1.2 (Boot
Steps).
Scanning Enabled Under
Unit
Power State
discrete
On/Off
Scanning Enabled Under
Unit
Power State
degrees C
On
Volts
On
Volts
On
Volts
On
Volts
On
Page 4 - 13
Software Description
Health LED/Sensor
No change
Health LED/Sensor
Exceeds critical threshold
Exceeds critical threshold
Exceeds critical threshold
Exceeds critical threshold
Exceeds critical threshold
AT8902M User Guide
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