Dell R610 Server User Manual


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Dell™ PowerEdge™ R610 Technical Guidebook
33
C. I
2
C (Inter-Integrated Circuit)
What is I
2
C? A simple bi-directional 2-wire bus for ecient inter-integrated circuit control. All I
2
C-bus
compatible devices incorporate an on-chip interface that allows them to communicate directly with each
other via the I
2
C-bus. This design concept solves the many interfacing problems encountered when
designing digital control circuits. These I
2
C devices perform communication functions between
intelligent control devices (e.g., microcontrollers), general-purpose circuits (e.g., LCD drivers, remote I/O
ports, memories), and application-oriented circuits.
The PowerEdge R610, BIOS accesses the I
2
C through the ICH9 (Intel I/O Controller Hub 9). There are two
MUXes on ICH9’s I2C bus.
•OneMUX(U_ICH_SPD)controlstheDIMMSPDsthroughfoursplitsegments
•TheotherMUX(U_ICH_MAIN)controlstheclockbuers,TOE,USBHubthroughfoursplit
segments.
BIOS controls both the MUXes through the two select lines using GPIO pins.
Clock chip, USB hub, and the front panel EEPROM device addresses are located on the IOH I
2
C bus.
SECTION 10. EMBEDDED NICS / LAN ON MOTHERBOARD (LOM)
A. Overview / Description
Embedded Gigabit Ethernet Controllers with TCP Ooad Engine (TOE) support. Two Broadcom
5709Cdual-portGigabitEthernetcontrollersandsupportcircuitryareinstalledonthesystemboardas
independent Ethernet interface devices. From a board perspective, the LOM refers to one of these
controllers. From a system perspective, the terms LOM and embedded NIC are interchangeable. LOM1
on the board has two ports: embedded NIC1 and embedded NIC2. These ports could also be called LOM1
and LOM2.
•x4PCIExpressGen2capableinterface
•TheR610operatesthiscontrolleratGen1speed
•IntegratedMACandPHY3072x18Bytecontextmemory
•64KBreceivebuer
•TOE(TCPOoadEngine)
•iSCSIcontroller(enabledthroughanoptionalhardwarekey)
•RDMAcontroller(RNIC)(enabledpost-RTSthroughanoptionalhardwarekey)
•NC-SI(NetworkController-SidebandInterface)connectionformanageability
•Wake-On-LAN(WOL)
•PXE2.0remoteboot
•iSCSIboot
•IPv4andIPv6support
•Baremetaldeploymentsupport
SECTION 11. I/O SLOTS
A. Overview / Description
The PowerEdge R610 requires two PCI Express risers:
•TwoPCIerisers(leftandcenter)providetwoPCIExpressexpansionslots,asfollows:
•Twox8PCIeGen2slots,connectedtotheIOH
•Onex4PCIeGen1slotforstorageonthecenterriser,connectedtotheICH9
•Supportforfull-height/half-length(6.6"maxlength)PCIecards
•Systemsupports25WmaximumpowerfortherstPCIecardand15Wforthesecond
PCIe card
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