641 datasheet(73/106 Pages) INTEL

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Datasheet

Land Listing and Signal Descriptions

§ §

VID[5:0]

Output

VID[5:0] (Voltage ID) signals are used to support automatic

selection of power supply voltages (VCC). Refer to the Voltage

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 VCC 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.

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

sense point land V27 as described in the Voltage Regulator-Down

(VRD) 10.1 Design Guide for Desktop Socket 775.

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 VTT on the motherboard.

VTT_SEL

Output

The VTT_SEL signal is used to select the correct VTT voltage level

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

to VTT.

VTTPWRGD

Input

The processor requires this input to determine that the VTT voltages

are stable and within specification.

Table 25.

Signal Description (Sheet 1 of 9)

Name

Type

Description

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