Specifications

4
Components and Subsystems
40
Figure 7. SAS/SATA multiplexer connections
Ethernet controllers and interfaces
Gigabit Ethernet interfaces
TheCPMusestwodualgigabitEthernetcontrollers(Intel82576EBdevices)toprovide
fourGbEports.OnecontrollerisusedforthetwoGbEBaseinterfacechannels,andthe
otherisusedforthefrontpanelandRTMEthernetports.
EachcontrollerhastwoindependentnetworkinterfacesthatsupportSerDes(serializer‐
deserializer),SGMII,orMDI(copper)protocols.Eachcontrollerisconnectedtoax4PCIe
portthatoperatesat2.5Gbpsandiscapableofnegotiatingx2andx1linkwidths.
TheEthernetcontrollersprovidevirtualizationsupportincludingPCI‐SIGsingle‐rootI/O
virtualization,VMDq2supportforupto8virtualmachinesand16TXandRXqueues.A
systemmanagementbus(SMBus)interfacesupportspass‐throughtrafficforSerial‐over‐
LANfromtheIPMC.
EachEthernetcontrollerhasaprivate128‐KBSPIEEPROMforstoringinitializationdata
andmediaaccesscontrol(MAC)addresses.Duringpowerup,theinitialconfiguration
informationforthecontrollers(includingmanagementsetupandSMBusaddresses)is
readfromtheseEEPROMs.RefertoOverviewoffirmwareupdatesonpage 87for
informationaboutupdatingtheEEPROMsoftware.
ThecontrollershavetwofullyintegratedgigabitEthernetMACandPHY(physicallayer)
ports.ThesedevicesusethePCIExpressarchitecture(revision1.0a).
SATA
Multiplexer
Port B
Port A
SAS
SATA
SATA
AMC Bay
(SAS / SATA
HDD)
Intel
ICH10R
Zone 3
Connector
J30
SAS/SATA
SAS/SATA
Port 0 Port 1
Port 2
Port 3
SATA 0
SAS 1
SAS 0