Intel G840 CM8062301046104 Data Sheet

72

Datasheet

VRDSEL

Input

This input should be left as a no connect in order for the processor to 
boot. The processor will not boot on legacy platforms where this 
land is connected to V

SS

. 

VSS

Input

VSS are the ground pins for the processor and should be connected 
to the system ground plane. 

VSSA

Input

VSSA is the isolated ground for internal PLLs.

VSS_SENSE

Output

VSS_SENSE is an isolated low impedance connection to processor 
core V

SS

. It can be used to sense or measure ground near the silicon 

with little noise.

VSS_MB_
REGULATION

Output

This land is provided as a voltage regulator feedback sense point for 
V

SS

. It is connected internally in the processor package to the sense 

point land V27 as described in the Voltage Regulator-Down (VRD) 
11.0 Processor Power Delivery Design Guidelines For Desktop 
LGA775 Socket.

VTT

Input

Miscellaneous voltage supply.

VTT_OUT_LEFT

VTT_OUT_RIGHT

Output

The VTT_OUT_LEFT and VTT_OUT_RIGHT signals are included to 
provide a voltage supply for some signals that require termination to 
V

TT

 on the motherboard. 

VTT_SEL

Output

The VTT_SEL signal is used to select the correct V

TT

 voltage level for 

the processor. This land is connected internally in the package to 
V

TT

.