Intel® Server Board S3420GP TPS Functional
Architecture
Revision 2.4
Intel order number E65697-010
33
3.8
Network Interface Controller (NIC)
The Intel
®
Server Board S3420GPLX, S3420GPLC and S3420GPV support two network
interfaces, One is provided from the onboard Intel
®
82574L GbE PCI Express network controller;
the other is the onboard Intel
®
82578 Gigabit Network controller.
3.8.1
GigE Controller 82574L
The 82574 family (82574L and 82574IT) are single, compact, low-power components that offer
a fully-integrated Gigabit Ethernet Media Access Control (MAC) and Physical Layer (PHY) port.
The 82574 uses the PCI Express* architecture and provides a single-port implementation in a
relatively small area so it can be used for server and client configurations as a LAN on
Motherboard (LOM) design.
External interfaces provided on the 82574:
PCIe Rev. 2.0 (2.5 GHz) x1
MDI (Copper) standard IEEE 802.3 Ethernet interface for 1000BASE-T, 100BASETX,
and 10BASE-T applications (802.3, 802.3u, and 802.3ab)
NC-SI or SMBus connection to a Manageability Controller (MC)
EEE 1149.1 JTAG (note that BSDL testing is NOT supported)
3.8.2
GigE PHY 82578DM
The 82578 is a single port Gigabit Ethernet Physical Layer Transceiver (PHY). It connects to the
Media Access Controller (MAC) through a dedicated interconnect. The 82578DM supports
operation at 1000/100/10 Mb/s data rates. The PHY circuitry provides a standard IEEE 802.3
Ethernet interface for 1000BASE-T, 100BASE-TX, and 10BASE-T applications (802.3, 802.3u,
and 802.3ab).
The 82578 operates with the Platform Controller Hub (PCH) chipset that incorporates the MAC.
The 82578 interfaces with its MAC through two interfaces: PCIe-based and SMBus. The PCIe
(main) interface is used for all link speeds when the system is in an active state (S0) while the
SMBus is used only when the system is in a low power state (Sx). In SMBus mode, the link
speed is reduced to 10 Mb/s. The PCIe interface incorporates two aspects: a PCIe SerDes
(electrically) and a custom logic protocol.
3.8.3
MAC Address Definition
Each Intel
®
Server Board S3420GPLX has the following four MAC addresses assigned to it at
the Intel factory:
NIC 1 MAC address
NIC 2 MAC address – Assigned the NIC 1 MAC a1
Integrated BMC LAN Channel MAC address – Assigned the NIC 1 MAC a2
Intel
®
Remote Management Module 3 (Intel
®
RMM3) MAC address – Assigned the NIC 1
MAC a3
Each Intel
®
Server Board S3420GPLC has the following three MAC addresses assigned to it at
the Intel factory:
NIC 1 MAC address
NIC 2 MAC address – Assigned the NIC 1 MAC a1
