Alert Standard Format (ASF) Specification

Alert Standard Format (ASF) Specification v2.0 DMTF Document DSP0136
DSP0136 23 April 2003 Page 69 of 94
• This following format of the asynchronous notification includes a PEC byte. The notifying
device uses this format when the device sends a notification to an Auxiliary Management
Device.
1 7 1 1 7 1 1 8 1 8 1 8 1 1
S Target Address Wr A Sending
Device
Address
A Data Byte Low A Data Byte
High
A PEC Byte A P
Auxiliary
Management
Device
Address
0 0 ASF-
Sensor
Address
0 0 Interface 0 Alert Value 0 [data
dependent]
0
5.1.3 Alert Configuration Message
Any ASF-sensor capable of issuing either Push Alert or Asynchronous Alert Notification
messages must also support this standard message that sets the event targets, the retry limits
and the notification masks. The effect of the Alert Configuration is immediate so that re-
configuration may cause a pushed alert or alert notification to be masked and disabled.
When an SMBus master device issues this message via an [SMBus 2.0] write-block format, the
master device specifies the configuration to be set into the ASF-sensor; when the master device
issues the message via an [SMBus 2.0] block-read format, the ASF-sensor responds to the
message with its current configuration.
The following fields are specified within the Alert Configuration Message:
Field Name Bit(s) Meaning
Interface
Class
7:4 Major class:
1000b ASF
Others Reserved for future definition by this specification.
3:0 Minor Class. These definitions apply when the Major Class is ASF
(1000b).
1000b Push alert/notification control register
Others Reserved for future definition by this specification.
Push
Configuration
7 Global Message Enable. Set to 1b to enable the device to issue Push
Alert and Asynchronous Alert Notification messages. The device clears
this bit to 0b as a default and on each power-on reset.
6 Host Message Enable. Set to 1b to enable the device to send its alerts to
the SMBus host address (0x10). The device clears this bit to 0b as a
default and on each power-on reset.
5 Host PEC Enable. Set to 1b to enable the device to send its alerts to the
SMBus host address (0x10) with PEC. The device clears this bit to 0b as
a default and on each power-on reset.
4 Reserved for future definition by this specification, set to 0b.
3:0 Retry Limit. This value defines the number of times the device will retry
an SMBus message that is NACKed by the message target. If the value
is 0h, the device sends each message only once with no retries; if the
value is Fh, the retry limit is unlimited and the device sends each
message until the target successfully receives it or the associated event
clears.
Auxiliary
Management
Device
Address 1
7:1 SMBus Address. Identifies the SMBus address of a target Auxiliary
Management Device other than the SMBus host. If the value is 0000
000b, no device address is specified.