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FH8065401488912
Volume 2—Gigabit Ethernet (GbE) Controller—C2000 Product Family
Architectural Overview
Intel
®
Atom™ Processor C2000 Product Family for Microserver
Datasheet, Vol. 2 of 3
September 2014
200
Order Number: 330061-002US
The SGMII link mode is used when external PHY components are used. For proper
network operation, both the LAN Port MAC and the external PHY component must be
properly configured, either explicitly via software or via hardware auto-negotiation,
with identical speed and duplex settings. The SGMII Auto-Negotiation functionality is
similar to what is defined in Clause 37 of the IEEE Standard 802.3-2008. The GbE
controller provides an external MDIO/MDC interface to configure external PHYs
connected to the LAN Port SGMII interface. See
Refer to Appendix D of the Intel
®
Atom™ Processor C2000 Product Family Platform
Design Guide (PDG) for guidance on which external PHYs are supported.
Each GbE controller LAN Port can provide MAC loopback where the controller’s internal
serial/deserial unit is not functional and data sent by the SoC root complex is fed-back
to the root complex. Each LAN port also has the loopback capability where the serial/
deserial unit is functional and the data normally sent over the LAN Port interface to the
backplane or external PHY is instead fed-back to the serial/deserial unit and back to the
root complex.
For detailed information on configuring, auto negotiation, Ethernet flow control,
loopback and controlling the LAN Ports and external PHYs, see the Intel
®
Atom™
Processor C2000 Product Family Integrated GbE Controller Programmer’s Reference
Manual (PRM). Also refer to the PRM for these LAN Port features:
• Device power management and power states
• DMA Coalescing
• Broadcast Wake Up
• IPv4/IPv6 packet-detect support
• Magic Packet detection and operation
• Packet pattern flexible filters
• DMA Coalescing
• Broadcast Wake Up
• IPv4/IPv6 packet-detect support
• Magic Packet detection and operation
• Packet pattern flexible filters
. Board design guidelines are given in the Intel
®
Atom™
Processor C2000 Product Family Platform Design Guide (PDG).