Alert Standard Format (ASF) Specification

Alert Standard Format (ASF) Specification v2.0 DMTF Document DSP0136
DSP0136 23 April 2003 Page 68 of 94
Field
Name
Bit(s) Meaning
3:0 Specified by the Interface Class. The combination of the Interface Class
value and this field’s value defines the interpretation of the Alert Value field.
• For Interface Class = 000b (ASF), the field contains the Notification Type,
one of:
0h Reserved for future Alert-sending Device Receive Message
Notification
1h Reserved for future Alert-sending Device Transmit Message
Notification.
2h ASF-sensor Device Event
3h Alert-Sending Device Event
Others Reserved for future definition by this specification.
• For Interface Class = 001b (IPMI), the values are specified by [IPMI].
• For Interface Class = 010b (OEM), the manufacturer identified by the
notifying device’s SMBus 2.0 UID specifies the value.
Alert
Value
7:0 For Interface Class = 000b (ASF), the interpretation of this field is specified
by the Notification Type value:
• When Notification Type = 2h (ASF-sensor Device Event), the Alert Value
contains an Event Status Index of the form 00bb_bbbb.
• When Notification Type = 3h (Alert-Sending Device Event), the Alert
Value contains an Event Type of the form 0000_bbbb where 'bbbb' is the
Event Type value and the remaining bits of the field are reserved for
future definition by this specification. Event Type values are:
0000b The alert-sending device has completed its boot-up
processing and is ready to accept a command.
0001b The alert-sending device's media transport has
transitioned from invalid/down to valid/up.
0010b The alert-sending device's media transport has
transitioned from valid/up to invalid/down
Remaining enumerations are reserved for future definition by this
specification.
• This field’s value is undefined for all other Notification Type values.
This following format of the asynchronous notification does not include a PEC byte. The notifying
device uses this format when it sends a notification to the SMBus host.
1 7 1 1 7 1 1 8 1 8 1 1
S Target Address Wr A Sending Device
Address
A Data Byte Low A Data Byte High A P
SMBus Host (0x10) 0 0 ASF-Sensor
Address
0 0 Interface 0 Alert Value 0