Intel E5-2440 BX80621E52440 User Manual

Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families

151

Datasheet Volume One

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, and 3 respectively. The valid voltage of this supply (1.50 V or 

1.35 V) 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. 

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 (1.8V) 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.

VSA has a Vboot setting of 0.9V. Refer to the VR12/IMVP7 

.

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 appropriate Platform 

Design Guide (PDG)for implementation details.