Dell PowerEdge R610 - I C (Inter-Integrated Circuit); Section 10. Embedded Nics; Lan on Motherboard (Lom); Overview; Description; Section 11. I;O Slots

Dell™ PowerEdge™ R610 Technical Guidebook
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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