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Note: This FAQ applies to the 495 ball BGA package processors only.
Is the Intel® Celeron® Processor - Low Power pin for pin compatible with the Intel® Pentium® III Processor - Low Power?
Yes, these processors are pin for pin compatible. It is thus possible to design a board that will support either processor, providing for a flexible solution.
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When designing a board that will support both Celeron - Low Power and Pentium III - Low Power processors, ensure that the voltage regulator requirements as well as thermal requirements of each processor to be used are met.
Which chipsets support the Intel Pentium III Processor - Low Power? Are design guides available? Are reference schematics available?
Both the 440BX and the 440MX chipsets will support the Pentium III Processor - Low Power. The design guides are available on the web:
Mobile Intel® Pentium® III Processor/440MX Chipset Platform Design Guide
Pentium III processor - Low Power/440BX AGPset Design Guide
Reference schematics are contained within the design guides.
What are the layout recommendations for the Intel Pentium III- Low Power (and Celeron Processor - Low Power) GTL+ PSB (Processor Side Bus)?
The GTL+ bus layout recommendations are contained within the
Pentium III processor - Low Power/440BX AGPset Design Guide.
What is involved in migrating from the Intel® Pentium® II - Low Power processor to the Pentium III - Low Power processor?
This will require a board redesign. These processors use a different size package. The Pentium II - Low Power uses a 615 ball BGA1 package while the Pentium III - Low Power uses a 495 ball BGA2 package. Also, the Pentium III - Low Power uses internal pull-ups for the GTL+ PSB; it does not require external pull-ups. The Pentium II - Low Power requires external pull-ups.
The VID table is different for the Low Power/Mobile processor as compared to the desktop processor. For example, for Low Power/Mobile processors, VID[4:0]= 01001 refers to 1.550V and with for desktop processors, it refers to 1.600V. Is this correct?
Yes, Mobile or Low Power processors use a different voltage identification table than desktop processors. Consult with your voltage regulator manufacturer for information on regulators that support Intel's mobile VID standard.
Why are there several balls missing from the underside of the Pentium III - Low Power processor?
The balls that are depopulated are one or more of the VID signals.
In a design, the VID[4:0] signals from the processor should be connected to the voltage regulator device. These signals tell the voltage regulator what core voltage to produce for the processor (based on a mobile VID voltage table - see Pentium III processor - Low Power datasheet). The VID signals should have external pull-ups on the motherboard (some voltage regulator devices already have internal pull-ups on these signals).
A populated VID ball on the processor is connected to GND internally. The voltage regulator device will interpret this as a '0'. If a VID ball is not populated, the pull-up on this signal will cause the voltage regulator to see a '1'.
Through this method, the proper VID code is presented to the voltage regulator, which in turn will provide a processor specific core voltage.
Where can I find the latest Microcode updates for the Pentium III processor - Low Power and Celeron processor - Low Power?
Please contact your local Intel representative.
Where can I find information (pad layout, assembly, rework, etc.) on the 495 BGA2 (H-PBGA) package?
This information can be found in Chapter 14 of the Intel Packaging Databook. Moisture sensitivity information can be found in Chapter 8.
Consult the Pentium III processor - Low Power datasheet for BGA2 package dimensions. |
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Intel® Celeron® Processor - Low Power and Pentium® III Processor - Low Power
