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PENTIUM® PROCESSOR

Intel 

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PENTIUM® PROCESSOR 75/90/100/120/133/150/166/200

1.0. MICROPROCESSOR

ARCHITECTURE OVERVIEW

The Pentium® processor 75/90/100/120/133/

150/166/200 extends the Intel Pentium family of

microprocessors. It is binary compatible with the

8086/88, 80286, Intel386™ DX CPU, Intel386 SX

CPU, Intel486™ DX CPU, Intel486 SX CPU,

Intel486 DX2 CPU, and Pentium processor 60/66.

The Pentium processor family consists of the

following products.

• Described in this document (product code

80502). The name “Pentium processor

75/90/100/120/133/150/166/200” will be used to

refer to these products:

– Pentium processor at 200 MHz, iCOMP®

Index 2.0 rating = 142

– Pentium processor at 166 MHz, iCOMP

Index 2.0 rating = 127

– Pentium processor at 150 MHz, iCOMP

Index 2.0 rating = 114

– Pentium processor at 133 MHz, iCOMP

Index 2.0 rating = 111

– Pentium processor at 120 MHz, iCOMP

Index 2.0 rating = 100

– Pentium processor at 100 MHz, iCOMP

Index 2.0 rating = 90

– Pentium processor at 90 MHz, iCOMP

Index 2.0 rating = 81

– Pentium processor at 75 MHz, iCOMP

Index 2.0 rating = 67

• Original Pentium processor. The name

“Pentium processor 60/66” will be used to refer

to the original 60 and 66 MHz version products:

– Pentium processor at 66 MHz, iCOMP

Index 2.0 rating = 57

– Pentium processor at 60 MHz, iCOMP

Index 2.0 rating = 51

The Pentium processor family architecture contains

all of the features of the Intel486 CPU family, and

provides significant enhancements and additions

including the following:

• Superscalar Architecture

• Dynamic Branch Prediction

• Pipelined Floating-Point Unit

• Improved Instruction Execution Time

• Separate 8K Code and 8K Data Caches

• Writeback MESI Protocol in the Data Cache

• 64-Bit Data Bus

• Bus Cycle Pipelining

• Address Parity

• Internal Parity Checking

• Functional Redundancy Checking

• Execution Tracing

• Performance Monitoring

• IEEE 1149.1 Boundary Scan

• System Management Mode

• Virtual Mode Extensions

In addition to the features listed above, the Pentium

processor 75/90/100/120/133/150/166/200 offers

the following enhancements over Pentium

processor 60/66:

• Fractional bus operation allowing higher core

frequency operation

• Dual processing support

• SL power management features

• On-chip local APIC device

1.1. Pentium® Processor Family

Architecture

The application instruction set of the Pentium

processor family includes the complete Intel486

CPU family instruction set with extensions to

accommodate some of the additional functionality of

the Pentium processors. All application software

written for the Intel386 and Intel486 family

microprocessors will run on the Pentium processors

without modification. The on-chip memory

management unit (MMU) is completely compatible

with the Intel386 family and Intel486 family of CPUs.

The Pentium processors implement several

enhancements to increase performance. The two

instruction pipelines and floating-point unit on

Pentium processors are capable of independent

operation. Each pipeline issues frequently used

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