82598EB Datasheet, PDF (436/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - SMBus Notification Methods
5.3.5.2 Asynchronous Notify Method
When configured using the asynchronous notify method, 82598EB acts as a SMBus master and notifies
the BMC by issuing a modified form of the write word transaction. The asynchronous notify transaction
SMBus address and data payload is configured using the Receive Enable command or using the EEPROM
defaults. Note that the asynchronous notify is not protected by a PEC byte.
1
7
S
Target Address
BMC Slave Address
1
1
Wr
A
0
0
7
Sending Device Address
MNG Slave SMBus Address
1
1
A
...
0
0
8
1
Data Byte Low
A
Interface
0
8
Data Byte High
Alert Value
1
1
A
P
0
Figure 5-8. Asynchronous Notify Command Format
The target address and data byte low/high is taken from the Receive Enable command or EEPROM
configuration.
5.3.5.3 Direct Receive Method
If configured, 82598EB has the capability to send a message it needs to transfer to the external BMC as
a master over the SMBus instead of alerting the BMC and waiting for it to read the message.
The message format is shown below. Note that the command that is used is the same command that is
used by the external BMC in the Block Read command. The opcode that 82598EB puts in the data is
also the same as it put in the Block Read command of the same functionality. The rules for the F and L
flags (bits) are also the same as in the Block Read command.
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