82598EB Datasheet, PDF (20/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Serial Flash Interface
1.9.4 Serial Flash Interface
The 82598EB provides an external SPI serial interface to a Flash (or boot ROM) device such as the
Atmel AT25F1024 or AT25FB512. The 82598EB supports serial Flash devices with up to 64 Mb (8 MB) of
memory. The size of the Flash used by the 82598EB can be configured by the EEPROM.
Note:
Though the 82598EB supports devices with up to 8 MB of memory, larger devices can be
used. Access to memory beyond the Flash device size results in access wrapping as only
lower address bits are used by the Flash control unit.
1.9.5 SMBus Interface
SMBus is an optional interface for pass-through and/or configuration traffic between an external BMC
and the 82598EB.
1.9.6 NC-SI Interface
NC-SI is an optional interface for pass-through and/or configuration traffic between a BMC and the
82598EB.
The following NC-SI capabilities are not supported:
• Collision Detection – The interface supports only full-duplex operation.
• MDIO – MDIO/MDC management traffic is not passed by NC-SI.
• Magic packets – magic packets are not detected by the 82598EB NC-SI receive end.
• The 82598EB is not 5 V dc tolerant and requires that signals conform to 3.3 V dc signaling.
The NC-SI interface provides a connection to an external BMC and operates in one of the following two
modes:
• NC-SI-SMBus Mode – In this mode, the NC-SI interface is functional in conjunction with an SMBus
interface, where pass-through traffic passes through NC-SI while configuration traffic passes
through SMBus.
• NC-SI Mode – In this mode, the NC-SI interface is functional as a single interface with an external
BMC, where all traffic between the 82598EB and the BMC flows through this interface.
1.9.7 MDIO Interfaces
The 82598EB implements two MII Management Interfaces (also known as the Management Data Input/
Output or MDIO Interface) for a control plane connection between the XAUI MAC and PHY devices
(master side). This interface provides the MAC and software the ability to monitor and control the state
of the PHY. The 82598EB supports both 802.3 and 802.3ae data formats for 1 Gb/s and 10 Gb/s
operation. The electricals for the MDIO interface are according to 802.3. Those interfaces can be
controlled by software via MDI single command and address – MSCA (0x0425C; RW).
Each MDIO interface should be connected to the relevant PHY as shown in the following example (each
MDIO interface is driven by the appropriate MAC function).
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