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Signal Definitions

88 Intel® Xeon® Processor 7400 Series Datasheet

VID[6:1] O VID[6:1] (Voltage ID) pins are used to support automatic selection of power

supply voltages (V

). These are CMOS signals that are driven by the processor

and must be pulled up through a resistor. Conversely, the voltage regulator output

must be disabled prior to the voltage supply for these pins becomes invalid. The

VID pins are needed to support processor voltage specification variations. See

Table 2-3 for definitions of these pins. The VR must supply the voltage that is

requested by these pins, or disable itself.

VSS_SENSE

VSS_SENSE2

O VSS_SENSE and VSS_SENSE2 provides an isolated, low impedance connection to

the processor core power and ground. This signal should be connected to the

voltage regulator feedback signal, which insures the output voltage (that is,

processor voltage) remains within specification. Please see the applicable platform

design guide for implementation details.

VTT P The FSB termination voltage input pins. Refer to Table 2-9 for further details.

VTT_SEL O The VTT_SEL signal is used to select the correct V

voltage level for the processor.

VTT_SEL is connected to ground on the Intel® Xeon® Processor 7400 Series

package.

Table 5-1. Signal Definitions (Sheet 8 of 8)

Name Type Description Notes

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 135 136

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