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AMD-X5-133

Am5X86™ Microprocessor Family

Advanced Micro Devices 

PRELIMINARY

Am5X86™

Microprocessor Family

Advanced

Micro

Devices

DISTINCTIVE CHARACTERISTICS

s High-Performance Design

— Industry-standard write-back cache support

— Frequent instructions execute in one clock

— 105.6-million bytes/second burst bus at 33 MHz

— Flexible write-through and write-back address

control

— Advanced 0.35-µ CMOS-process technology

— Dynamic bus sizing for 8-, 16-, and 32-bit buses

— Supports “soft reset” capability

s High On-Chip Integration

— 16-Kbyte unified code and data cache

— Floating-point unit

— Paged, virtual memory management

s Enhanced System and Power Management

— Stop clock control for reduced power

consumption

— Industry-standard two-pin System Management

Interrupt (SMI) for power management indepen-

dent of processor operating mode and operating

system

— Static design with Auto Halt power-down support

— Wide range of chipsets supporting SMM avail-

able to allow product differentiation

s Complete 32-Bit Architecture

— Address and data buses

— All registers

— 8-, 16-, and 32-bit data types

s Standard Features

— 3-V core with 5-V tolerant I/O

— Available in a 133-MHz version

— Binary compatible with all Am486®DX,

Am486DX2, and Am486DX4 microprocessors

— Wide range of chipsets and support available

through the AMD FusionPCSM Program

s 168-pin PGA package or 208-pin SQFP package

s IEEE 1149.1 JTAG Boundary-Scan Compatibility

s Supports Environmental Protection Agency's

Energy Star program

— 3-V operation reduces power consumption up to

40%

— Energy management capability provides excel-

lent base for energy-efficient design

— Works with a variety of energy-efficient, power-

managed devices

GENERAL DESCRIPTION

The Am5X86™ microprocessor is an addition to the AMD

microprocessor product family. The new processor en-

hances system performance by raising the microproces-

sor operating frequency to the highest levels allowed by

current manufacturing technology, while maintaining

complete compatibility with the standard Am486 proces-

sor architecture and Microsoft® Windows®. The CPUs

incorporate write-back cache, flexible clock control, and

enhanced SMM. Table 1 shows available processors

in the Am5X86 microprocessor family.

Table 1. Clocking Options

Operating

Frequency

133 MHz

133 MHz

Input Clock

33 MHz

33 MHz

Available Package

168-pin PGA

208-pin SQFP

The Am5X86 microprocessor family allows write-back

configuration through software and cacheable access

control. On-chip cache lines are configurable as either

write-through or write-back. The CPU clock control fea-

ture permits the CPU clock to be stopped under con-

trolled conditions, allowing reduced power consumption

during system inactivity. The SMM function is implement-

ed with an industry standard two-pin interface.

This document contains information on a product under development at Advanced Micro Devices. The information is

intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed

product without notice.

Publication # 19751 Rev: C Amendment/0

Issue Date: March 1996

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