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82575 Ethernet Controller Design Guide
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
.
3.4 Power Supplies for the 82575 Ethernet Controller
Controllers
The 82575 Ethernet Controller Gigabit Ethernet Controllers require three power rails:
3.3 V, 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.
External BMC
SMB
(82575)
(Configuration traffic in NCSI/
SMB Mode)
NCSI
(82575)
(All traffic in NCSI Mode and
pass-thru traffic in NCSI/SMB
Mode)
SMBCLK
SMBD
SMBALRT_N
NCSI_RXD[1:0]
NCSI_CRS_DV
NCSI_TXD[1:0]
NCSI_TX_EN
NCSI_CLK_IN
NCSI_CLK_OUT