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Datasheet

Electrical Specifications

2.4

Voltage Identification

The VID specification for the Celeron D processor is supported by the applicable VRD design

guide. The voltage set by the VID pins is the maximum voltage allowed by the processor. A

minimum voltage is provided in Table 2-8 and changes with frequency. This allows processors

running at a higher frequency to have a relaxed minimum voltage specification. The specifications

have been set such that one voltage regulator can work with all supported frequencies.

Individual processor VID values may be calibrated during manufacturing such that two devices at

the same speed may have different VID settings.

The Celeron D processor uses six voltage identification pins, VID[5:0], to support automatic

selection of power supply voltages. Table 2-2 specifies the voltage level corresponding to the state

of VID[5:0]. A ‘1’ in this table refers to a high voltage level and a ‘0’ refers to low voltage level. If

the processor socket is empty (VID[5:0] = x11111), or the voltage regulation circuit cannot supply

the voltage that is requested, it must disable itself. See the applicable VRD design guide for more

details.

Power source characteristics must be guaranteed to be stable whenever the supply to the voltage

regulator is stable.

The Celeron D processor’s Voltage Identification circuit requires an independent 1.2 V supply and

some other power sequencing considerations.

Table 2-2. Voltage Identification Definition

VID5

VID4

VID3

VID2

VID1

VID0

VID

VID5

VID4

VID3

VID2

VID1

VID0

VID

101001

0.850

111001

1.225

101000

0.875

111000

1.250

100111

0.900

110111

1.275

100110

0.925

110110

1.300

100101

0.950

110101

1.325

100100

0.975

110100

1.350

100011

1.000

110011

1.375

100010

1.025

110010

1.400

100001

1.050

110001

1.425

100000

1.075

110000

1.450

111111

VR output

off

101111

1.475

111110

1.100

101110

1.500

111101

1.125

101101

1.525

111100

1.150

101100

1.550

111011

1.175

101011

1.575

111010

1.200

101010

1.600

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