Dell POWEREDGE R710 User Manual
Page 32
Dell™ PowerEdge™ R710 Technical Guidebook
32
Table: Nehalem P-State Projections
C. I
2
C (Inter-Integrated Circuit)
What is I
2
C? A simple bi-directional 2-wire bus for efficient inter-integrated circuit control. All I
2
C-bus
compatible devices incorporate an on-chip interface which 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 R710, BIOS accesses the I
2
C through the ICH9 (Intel I/O Controller Hub 9). There are two
MUXes on ICH9’s I
2
C bus.
• One MUX (U_ICH_SPD) controls the DIMM SPDs through four split segments
• The other MUX (U_ICH_MAIN) controls the clock buffers, 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 Offload Engine (TOE) support
Two embedded Broadcom 5709C dual-port LAN controllers are on the R710 planar as independent
Gigabit Ethernet interface devices. The following information details the features of the LAN devices.
• x4 PCI Express Gen2 capable interface
• The PowerEdge R710 operates this controller at Gen1 speed
• Integrated MAC and PHY 3072x18 Byte context memory
• 64 KB receive buffer
• TOE (TCP Offload 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
PROc
numbeR
qDf #
fRequency
stanDaRD
tDP
lfm tDP
P-state
nOtes
E5540
Q1G2
2.53
80
75
Pmin+7
D-0
X5550
Q1GJ
2.67
95
75
Pmin+8
D-0
X5560
Q1GF
2.80
95
75
Pmin+9
D-0
X5570
Q1G9
2.93
95
75
Pmin+10
D-0
W5580
Q1G6
3.20
130
98
Pmin+12
D-0