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
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
0.850
0.875
0.900
0.925
0.950
0.975
1.000
1.025
1.050
1.075
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
1.450
VRoutput
off
1
1
1
1
1
1
1
0
1
1
1
1
1.475
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
1
0
0
1
1
0
1
0
1
0
1.100
1.125
1.150
1.175
1.200
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
0
0
1
1
0
1
0
1
0
1.500
1.525
1.550
1.575
1.600
Datasheet
17
INTEL [ INTEL ]
