Alert Standard Format (ASF) Specification

Alert Standard Format (ASF) Specification v2.0 DMTF Document DSP0136
DSP0136 23 April 2003 Page 72 of 94
1 7 1 1 8 1 8 1
S Slave Address Wr A Command A Byte Count A
• • •
Alert-sending Device Address 0 0 Management Control
0000 0010
0 0000 0010 0
8 1 8 1 8 1 1
Data1 A Data2 A PEC A P
Sub Command
Stop Watchdog Timer
0001 0100
0 Version Number
0001 0000
0 [data dependent] 0
5.1.5 Push Alert Messages
These messages enable other SMBus masters to “push” a message containing PET frame
information to an alert-sending device; the alert-sending device builds and transmits the
message. Each message is variable in length to enable the initiator’s use of the optional
Event
Data fields — up to five (5) bytes.
If the alert-sending device is either temporarily unable to handle the message or unable to send
the requested PET frame because the device’s transport media is down, the device must NACK
the message according to [SMBUS_2.0] definitions. The managed client’s firmware might
choose to wait for the ASF alert-sending device to establish connection with its transport media.
For example, an Ethernet device might require additional time from a cold power-on to establish a
network connection. See Get Power-on Wait Time (GPWT) and Set Power-on Wait Time
(SPWT) for the system methods through which the alert-sending device’s OS-present
configuration software records its required values.
5.1.5.1 Message with Retransmission
If the alert-sending device is either temporarily unable to handle the message or unable to send
the requested PET frame because the device’s transport media is down, the device must NACK
the message according to [SMBUS_2.0] definitions. Otherwise, the PET frame’s transmission
follows the retransmission rules outlined in section 3.1.1.1.
1 7 1 1 8 1
S Slave Address Wr A Command A
• • •
Alert-sending Device Address 0 0 Messaging
0000 0100
0
8 1
Byte Count A
• • •
0000 1011 to 0001 0000
16
0
8 1 8 1 8 1 8 1
Data1 A Data2 A Data3 A Data4 A
• • •
Sub Command Retransmit
0001 0101
0 Version Number
0001 0000
0 Event Sensor Type 0 Event Type 0
8 1 8 1 8 1 8 1
Data5 A Data6 A Data7 A Data8 A
• • •
Event Offset 0 Event Source Type 0 Event Severity 0 Sensor Device 0
16
Byte Count ranges from 11 to 16, depending on the number of Event Data bytes included (0 to
5).