Datasheet

Intel® Xeon® Processor E5-2400 v2 Product Family 123
Datasheet Volume One
Signal Descriptions
6.10 Processor Power and Ground Supplies
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Table 6-15. Power and Ground Signals
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 VR12/IMVP7 Pulse Width
Modulation Specification
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 Variable power supply for the processor system memory interface.
Provided by two VRM/EVRD 12.0 compliant regulators per CPU
socket. VCCD is used for memory channels 1, 2, & 3. The valid
voltage of this supply (1.50V or 1.35V) is configured by BIOS after
determining the operating voltages of the installed memory.
Note: The processor must be provided VCCD 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.V) for the processor phased lock loop (PLL).
VSA Variable power supply for the processor system agent units. These
include logic (non-I/O) for the integrated I/O controller, the
integrated memory controller (iMC), the Intel® QPI agent, and the
Power Control Unit (PCU). The output voltage of this supply is
selected by the processor, using the serial voltage ID (SVID) bus.
Note: VSA has a Vboot setting of 0.9V. Refer to the VR12/IMVP7
Pulse Width Modulation Specification
VSS Processor ground node.
VTTA
VTTD
Combined fixed analog and digital power supply for I/O sections of
the processor Intel QPI interface, Direct Media Interface Gen 2
(DMI2) interface, and PCI Express* interface. These signals will
also be referred to as VTT. Please see the Platform Design Guide
(PDG) for implementation details.