Datasheet

Land Listing and Signal Descriptions
70 Datasheet
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VID_SELECT Output
This land is tied high on the processor package and is used by the
VR to choose the proper VID table. Refer to the Voltage Regulator-
Down (VRD) 11.0 Processor Power Delivery Design Guidelines For
Desktop LGA775 Socket for more information.
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
VSSA provides isolated ground for internal PLLs on previous
generation processors.
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 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
.
Table 23. Signal Description (Sheet 9 of 9)
Name Type Description