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Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families 125
Datasheet Volume One of Two
Signal Descriptions
6.10 Processor Power and Ground Supplies
Table 6-15. Miscellaneous Signals
Signal Name Description
IVT_ID_N This output can be used by the platform to determine if the installed
processor is an Intel® Xeon® processor E5-1600 v2 product family, Intel®
Xeon® processor E5-2600 v2 product family or Intel® Xeon® processor E5-
1600/E5-2600 product families.
This is pulled to ground on the processor package.This signal is also used by
the VCCPLL and VTT rails to switch their output voltage to support future
processors.
SKTOCC_N SKTOCC_N (Socket occupied) is used to indicate that a processor is present.
This is pulled to ground on the processor package; there is no connection to
the processor silicon for this signal.
Table 6-16. Power and Ground Signals (Sheet 1 of 2)
Signal Name Description
VCC
Variable power supply for the processor cores, lowest level caches
(LLC), ring interface, and home agent. It is provided by a
VRM/EVRD 12.0 compliant regulator for each CPU socket. The
output voltage of this supply is selected by the processor, using the
serial voltage ID (SVID) bus.
Note: VCC has a Vboot setting of 0.0V and is not included in the
PWRGOOD indication. Refer to the compatible VR12.0
PWM controller.
VCC_SENSE
VSS_VCC_SENSE
VCC_SENSE and VSS_VCC_SENSE provide an isolated, low
impedance connection to the processor core power and ground.
These signals must be connected to the voltage regulator feedback
circuit, which insures the output voltage (that is, processor
voltage) remains within specification. Please see the applicable
platform design guide for implementation details.
VSA_SENSE
VSS_VSA_SENSE
VSA_SENSE and VSS_VSA_SENSE provide an isolated, low
impedance connection to the processor system agent (VSA) power
plane. These signals must be connected to the voltage regulator
feedback circuit, which insures the output voltage (that is,
processor voltage) remains within specification. Please see the
applicable platform design guide for implementation details.
VTTD_SENSE
VSS_VTTD_SENSE
VTTD_SENSE and VSS_VTTD_SENSE provide an isolated, low
impedance connection to the processor I/O power plane. These
signals must be connected to the voltage regulator feedback
circuit, which insures the output voltage (that is, processor
voltage) remains within specification. Please see the applicable
platform design guide for implementation details.
VCCD_01 and VCCD_23
Variable power supply for the processor system memory interface.
Provided by two VRM/EVRD 12.0 compliant regulators per CPU
socket. VCCD_01 and VCCD_23 are used for memory channels 0,
1, 2, & 3 respectively. The valid voltage of this supply (1.50V or
1.35V) is configured by BIOS after determining the operating
voltages of the installed memory. VCCD_01 and VCCD_23 will also
be referred to as VCCD.
Note: The processor must be provided VCCD_01 and VCCD_23
for proper operation, even in configurations where no
memory is populated. A VRM/EVRD 12.0 controller is
recommended, but not required.
VCCPLL
Fixed power supply (1.7V) for the processor phased lock loop
(PLL).