Name: Intel Pentium III
Brand: Intel
Rating: 4 (1 reviews)

To Next Page

To Previous Page

7-6 Intel

Pentium

III Processor with 512KB L2 Cache Dual Processor Platform Design Guide

7.5 Dual Processor Specific Pin Recommendations

7.5.1 DETECT (AF36)

The DETECT pin in dual processor Intel

Pentium

III Processor with 512KB L2 Cache designs is not

used. This pin is used by uniprocessor, Universal Motherboard designs to detect what processor is

installed in the socket (AGTL+ only or AGTL compatible processor). Intel recommends leaving the

DETECT pin unconnected or connecting it to ground in dual processor designs.

7.5.2 RESET2 (AJ3)

The RESET2 pin is used to hold an Intel

Pentium

IIIProcessorwith512KBL2Cacheinresetifitis

placed in an incompatible platform. Intel recommends this pin be left as a no connect on Intel

Pentium

III Processor with 512KB L2 Cache dual processor system designs.

7.5.3 KEY (AM2)

The KEY pin is part of the electrical keying feature of an Intel

Pentium

III Processor with 512KB L2

Cache compatible system. It is used to prevent incompatible AGTL+ only processors from functioning in

the system. An AGTL+ only processor placed in the system will be held in reset by this pin. Intel

recommends the KEY pin be connected to ground in Intel

Pentium

III Processor with 512KB L2 Cache

dual processor platforms to allow this electronic key feature to work correctly.

7.6 AGTL Bus Transition

The Intel

Pentium

III Processor with 512KB L2 Cache introduces a new signaling voltage level of 1.25

volts. This new signalling level is termed AGTL. Because of the different signaling levels, the AGTL and

the older AGTL+ signaling are incompatible. Table 7-2 summarizes the signaling aspects of the two

schemes and how they relate to the processors of interest.

Because of the different signaling levels, an Intel

Pentium

III Processor with 512KB L2 Cache will not

operate in an AGTL+ only processor platform. An AGTL+ only processor, similarly, will not operate in an

AGTL Intel

Pentium

III Processor with 512KB L2 Cache platform. The Intel

Pentium

III Processor

(CPUID 068xh) with AGTL Capability has auto-detecting I/O buffers that are compatible with both AGTL

and AGTL+.

Table 7-2. Signalling Parameter Comparisons

AGTL+ Only

Processors

Intel

Pentium

III

Processor (CPUID

068xh) with AGTL

Capability

Intel

Pentium

III

Processor with 512KB

L2 Cache

Signalling Level 1.5V Only 1.25 or 1.5 V, Auto-detect 1.25V Only

GTL Reference 1.0V 0.833V or 1.0V, Auto-detect 0.833V

Brand	Intel
Model	Pentium III
Category	Computer Hardware
Language	English

Intel Pentium III User Manual

Table of Contents

Questions and Answers:

Intel Pentium III Specifications

Related product manuals