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Land Listing and Signal Descriptions
Table 25.
Signal Description (Sheet 1 of 9)
Name
VID[5:0]
VSS
VSSA
VSS_SENSE
VSS_MB_
REGULATION
VTT
VTT_OUT_LEFT
VTT_OUT_RIGHT
VTT_SEL
VTTPWRGD
Datasheet
Type
VID[5:0] (Voltage ID) signals are used to support automatic
selection of power supply voltages (V
Regulator-Down (VRD) 10.1 Design Guide for Desktop Socket 775
for more information. The voltage supply for these signals must be
valid before the VR can supply V
Output
the VR output must be disabled until the voltage supply for the VID
signals becomes valid. The VID signals are needed to support the
processor voltage specification variations. See
definitions of these signals. The VR must supply the voltage that is
requested by the signals, or disable itself.
VSS are the ground pins for the processor and should be connected
Input
to the system ground plane.
Input
VSSA is the isolated ground for internal PLLs.
VSS_SENSE is an isolated low impedance connection to processor
Output
core V
. It can be used to sense or measure ground near the
SS
silicon with little noise.
This land is provided as a voltage regulator feedback sense point
for V
. It is connected internally in the processor package to the
SS
Output
sense point land V27 as described in the Voltage Regulator-Down
(VRD) 10.1 Design Guide for Desktop Socket 775.
Miscellaneous voltage supply.
The VTT_OUT_LEFT and VTT_OUT_RIGHT signals are included to
Output
provide a voltage supply for some signals that require termination
to V
on the motherboard.
TT
The VTT_SEL signal is used to select the correct V
Output
for the processor. This land is connected internally in the package
to V
.
TT
The processor requires this input to determine that the V
Input
are stable and within specification.
§ §
Description
). Refer to the Voltage
CC
to the processor. Conversely,
CC
Table 2
voltage level
TT
for
voltages
TT
73
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