82598EB Datasheet, PDF (571/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - NC-SI Electrical Interface Requirements
Figure 8-1. External BMC Connections with NC-SI and SMBus
8.6.3 NC-SI Electrical Interface Requirements
This section describes the hardware implementation requirements necessary to meet the NC-SI
physical layer standard. Board-level design requirements are included for connecting the 82598
Ethernet solution to an external BMC. The layout and connectivity requirements are addressed in low-
level detail. This section, in conjunction with the Network Controller Sideband Interface Specification
Version 0.8 NC-SI Specification, also provides the complete board-level requirements for the NC-SI
solution.
The 82598’s on-board SMBus port enables network manageability implementations required for remote
control and alerting via the LAN. With SMBus, management packets can be routed to or from a BMC.
Enhanced pass-through capabilities also enable system remote control over standardized interfaces.
Also included is a new manageability interface (NC-SI) that supports the DMTF preOS sideband
protocol. An internal management interface called MDIO enables the MAC (and software) to monitor
and control the PHY.
8.6.3.1 External Baseboard Management Controller (BMC)
The external BMC is required to meet the latest NC-SI specification as it relates to the RMII electrical
interface.
8.6.3.2 NC-SI Reference Schematic
Figure 8-2 shows the recommended pull-up and pull-downs that should be used on the NC-SI interface
regardless of the application, even when not using the interface.
• NCSI_CLK_IN: A pull down should always be placed on this input to the 82598.
• NCSI_CRS_DV: A pull-down should always be used to ensure the data valid is never indicated
during start-up when the signal is not driven.
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