82598EB Datasheet, PDF (570/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Connecting the Manageability Interfaces
8.6
Connecting the Manageability Interfaces
SMBus and NC-SI are optional interfaces for pass-through and/or configuration traffic between the BMC
and the 82598.
Note: Intel recommends that the SMBus be connected to the MCH or BMC for the EEPROM recovery
solution. If the connection is to a BMC, it is able to send the EEPROM release command.
The 82598 can be connected to an external BMC and can operate in one of two modes:
• SMBus mode
• NC-SI mode
Note: Clock out (if enabled) is provided in all power states (unless the 82598 is disabled).
For more information on system management solutions, refer to Section 5..
8.6.1 Connecting the SMBus Interface
To connect the SMBus interface to the chipset or the BMC, connect the SMBD, SMBCLK and SMBALRT_N
signals to the corresponding pins of the chipset/BMC (see Figure 8-1). Note that these pins require pull-
up resistors to the 3.3 V dc supply rail.
If the SMBus interface is not used, the previously mentioned pull-up resistors on the SMBD, SMBCLK
and SMBALRT_N signals still have to be in place.
8.6.2 Connecting the NC-SI Interface
The NC-SI interface is a connection to an external BMC. It operates as a single interface with an
external BMC, where all traffic between the 82598 and the BMC flows through the interface (see
Figure 8-1).
570