A75 查看數據表（PDF） - Intel

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A75

PENTIUM® PROCESSOR

Intel 

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

E

The decode unit decodes the prefetched

instructions so the Pentium processors can

execute the instruction. The control ROM contains

the microcode which controls the sequence of

operations that must be performed to implement

the Pentium processor architecture. The control

ROM unit has direct control over both pipelines.

The Pentium processors contain a pipelined

floating-point unit that provides a significant

floating-point performance advantage over

previous generations of processors.

The architectural features introduced in this

chapter are more fully described in the Pentium®

Processor Family Developer’s Manual, Volume 1

(Order Number 241428).

1.2. Pentium® Processor

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

In addition to the architecture described above for

the Pentium processor family, the Pentium

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

additional features which are described in this

section.

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

150/166/200 offers higher performance and higher

operating frequencies than the Pentium processor

60/66.

Symmetric dual processing in a system is

supported with two Pentium processor

75/90/100/120/133/150/166/200. The two

processors appear to the system as a single

Pentium processor 75/90/100/120/133/150

/166/200. Operating systems with dual processing

support properly schedule computing tasks

between the two processors. This scheduling of

tasks is transparent to software applications and

the end-user. Logic built into the processors

support a “glueless” interface for easy system

design. Through a private bus, the two Pentium

processor

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

arbitrate for the external bus and maintain cache

coherency. Dual processing is supported in a

system only if both processors are operating at

identical core and bus frequencies.

In this document, in order to distinguish between

two Pentium processor 75/90/100/120/133/

150/166/200 in dual processing mode, one CPU

will be designated as the “Primary” processor and

the other as the “Dual” processor. Note that this is

a different concept than that of “master” and

“checker” processors described above in the

discussion on functional redundancy.

Due to the advanced 3.3V BiCMOS process that it

is produced on, the Pentium processor

75/90/100/120/133/150/166/200 dissipates less

power than the Pentium processor 60/66. In

addition to the SMM features described above, the

Pentium processor 75/90/100/120/133/150/

166/200 supports clock control. When the clock to

the Pentium processor 75/90/100/120/133/150/

166/200 is stopped, power dissipation is virtually

eliminated. The combination of these

improvements makes the Pentium processor

75/90/100/120/133/150/166/200 a good choice for

energy-efficient desktop designs.

Supporting an upgrade socket (Socket 5/7) in the

system will provide end-user upgradability by the

addition of a Pentium OverDrive processor. Typical

applications will realize a 40%–70% performance

increase by addition of a Pentium OverDrive

processor.

Socket 7 has been defined as the upgrade socket

for the Pentium processor 75/90/100/120/133/150/

166/200. The flexibility of the Socket 7 definition

makes it backward compatible with Socket 5 and

should be used for all new Pentium processor-

based system designs.

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

150/166/200 supports fractional bus operation.

This allows the internal processor core to operate

at high frequencies, while communicating with the

external bus at lower frequencies.

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

150/166/200 contains an on-chip Advanced

Programmable Interrupt Controller (APIC). This

APIC implementation supports multiprocessor

interrupt management (with symmetric interrupt

distribution across all processors), multiple I/O

subsystem support, 8259A compatibility, and inter-

processor interrupt support.

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