82575 Ethernet Controller Design Guide

External BMC

SMBCLK

SMBD

SMBALRT_N

NCSI_RXD[1:0]

NCSI_CRS_DV

NCSI_TXD[1:0]

NCSI_TX_EN

NCSI_CLK_IN

NCSI_CLK_OUT

SMB (82575)

(Configuration traffic in NCSI/

SMB Mode)

NCSI

(82575)

(All traffic in NCSI Mode and pass-thru traffic in NCSI/SMB Mode)

Figure 2. External BMC Connections with NC-SI and SMB

The 82575 Ethernet Controller also supports the DMTF protocol.

For more information about NC-SI and DMTF, see the 82575 Family System

Management Application Note.

3.4Power Supplies for the 82575 Ethernet Controller Controllers

The 82575 Ethernet Controller Gigabit Ethernet Controllers require three power rails:

3.3V, 1.8 V and 1.0 V. (See the 82575 Ethernet Controller Product Datasheet for power requirements.) A central power supply can provide all the required voltage sources, or the power can be derived from the 3.3 V supply and regulated locally using external regulators. If the LAN wake capability will be used, all voltages must remain present during system power down. Local regulation of the LAN voltages from system 3.3 Vmain and 3.3 Vaux voltages is recommended.

External voltage regulators need to generate the proper voltage, supply current requirements (with adequate margin), and provide the proper power sequencing.

Due to the current demand, a Switching Voltage Regulator (SVR) is highly recommended for the 1.0 V power rail. Figure 2 shows an example of a compact, low- part count, SVR that can be used for both the 1.0 V and 1.8 V power supplies.

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Intel 317698-001 manual Power Supplies for the 82575 Ethernet Controller Controllers

317698-001 specifications

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