W83791G Datasheet, PDF (23/99 Pages) Winbond – Winbond H/W Monitoring IC

W83791D/G
6.5 ASF (Alert Standard Format) Introduction
In order to implement network management in OS-absent, W83791D/G provides ASF Response
Registers to meet ASF sensor spec. As a result, the network server is able to monitor several
environmental status of the client in OS-absent by PET frame values returned from W83791D/G,
including temperature, voltage, fan speed, and case open. In below is the ASF diagram:
Alert Message
LAN on Card
Management
Server
Polling
PCI Bus
(PET Subset)
Motherboard
LAN on Board
SMBus
Chipset
791D
Slave
Figure 6. ASF Block Diagram
6.5.1 Platform Event Trap (PET)
PET is the ASF transmit protocol used to provide common fields for trap regardless of trap source.
The variable bindings fields in a PET frame contain the system and sensor information for an event,
such as event sensor type, event type, event offset, event source type, sensor device, sensor number,
entity ID, entity instance, event status index, event status, and event severity. Each field has its
definition and is described in the following table.
PET VARIABLE BINDING FIELD
Event Sensor Type
Event Type
Event Offset
Event source Type
DESCRIPTION
The Event Sensor Type field indicates what types of
events the sensor is monitoring. E.g. temperature,
voltage, fan, etc.
The Event Type indicates what type of transition/state
change triggered the trap.
The Event Offset indicates which particular event
occurred for a given Even Type.
The Event Source Type describes the originator of the
event. It is ASF1.0 (68h) for all PET frames defined by
this specification.
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Publication Release Date: April 14, 2006
Revision 1.1