Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz—Electrical Specifications
Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz
DS
January 2007
16
Order Number: 315876-002
3.3.2
FSB AGTL+ Decoupling
The processor integrates signal termination on the die as well as incorporate high
frequency decoupling capacitance on the processor package. Decoupling must also be
provided by the system motherboard for proper AGTL+ bus operation.
3.3.3
FSB Clock (BCLK[1:0]) and Processor Clocking
BCLK[01:00] directly controls the FSB interface speed as well as the core frequency of
the processor. As in previous generation processors, the Intel
®
Celeron
®
Processor
1.66 GHz/1.83 GHz core frequency is a multiple of the BCLK[01:00] frequency. The
Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz bus ratio multiplier is set at its default
ratio at manufacturing. The processor uses a differential clocking implementation.
3.4
Voltage Identification and Power Sequencing
The VID specification for the Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz is defined
by the
Embedded Voltage Regulator-Down (EmVRD) 11.0 Design Guidelines for
Embedded Implementations Supporting PGA478
.
The Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz uses six voltage identification pins,
VID[5:0], to support automatic selection of power supply voltages. The VID pins for
Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz are CMOS outputs driven by the
processor VID circuitry.
Table 3
specifies the voltage level corresponding to the state of
VID[5:0]. A ‘1’ in this refers to a high-voltage level and a 0 refers to low-voltage level.
For more details about VR design to support the Intel
®
Celeron
®
Processor 1.66 GHz/
1.83 GHz power supply requirements, please refer to the
Embedded Voltage Regulator-
Down (EmVRD) 11.0 Design Guidelines for Embedded Implementations Supporting
PGA478
.
Power source characteristics must be stable whenever the supply to the voltage
regulator is stable.
Table 3.
Intel
®
Celeron
®
Processor 1.66 GHz/1.83 GHz VID Map (Sheet 1 of 3)
VID5
VID4
VID3
VID2
VID1
VID0
V
CC
(V)
0
0
0
0
0
0
OFF
0
0
0
0
0
1
1.6000
0
0
0
0
1
0
1.5875
0
0
0
0
1
1
1.5750
0
0
0
1
0
0
1.5625
0
0
0
1
0
1
1.5500
0
0
0
1
1
0
1.5375
0
0
0
1
1
1
1.5250
0
0
1
0
0
0
1.5125
0
0
1
0
0
1
1.5000
0
0
1
0
1
0
1.4875
0
0
1
0
1
1
1.4750
0
0
1
1
0
0
1.4625
0
0
1
1
0
1
1.4500
0
0
1
1
1
0
1.4375
0
0
1
1
1
1
1.4250