Land Listing and Signal Descriptions

73 Datasheet

VID[7:0] Output

The VID (Voltage ID) signals are used to support automatic

selection of power supply voltages (V

). Refer to the Voltage

Regulator Design Guide for more information. The voltage supply

for these signals must be valid before the VR can supply V

to the

processor. Conversely, 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 Table 2 for definitions of these signals. The VR must

supply the voltage that is requested by the signals, or disable itself.

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

Design Guide 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

VSS Input

VSS are the ground pins for the processor and should be connected

to the system ground plane.

VSSA Input

VSSA provides isolated ground for internal PLLs on previous

generation processors. It may be left as a no connect on boards

supporting the processor.

VSS_SENSE Output

VSS_SENSE is an isolated low impedance connection to processor

core V

. 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

. It is connected internally in the processor package to the

sense point land V27 as described in the Voltage Regulator Design

Guide.

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

on the motherboard.

VTT_SEL Output

The VTT_SEL signal is used to select the correct V

voltage level

for the processor. This land is connected internally in the package

to V

Table 25. Signal Description (Sheet 10 of 10)

Name Type Description

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 99 100

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