PRELIMINARY
Am486® DX2 3.3-Volt Processor
High-Performance, Clock-Doubled, 32-Bit Microprocessor
Advanced
Micro
Devices
DISTINCTIVE CHARACTERISTICS
Operating voltage range 3.3 V ± 0.3 V
Complete 32-Bit Architecture
— 66-MHz and 80-MHz operating frequencies
— Wide range of chipsets and support available
through the AMD® FusionPCSM Program
— Address and data buses
— All registers
— 8-, 16-, and 32-bit data types
High Integration On-Chip
Multiprocessor Support
— 8-Kbyte code and data cache
— Floating-point unit
— Paged, virtual memory management
— Multiprocessor instructions
— Cache consistency protocols
— Support for second-level cache
High-Performance Design
Standard 168-pin PGA Package
—
—
—
—
—
Environmental Protection Agency's “Energy
Star” program compliant
Frequent instructions execute in one clock
105.6-million bytes/second burst bus at 33 MHz
128-million bytes/second burst bus at 40 MHz
Advanced submicron CMOS technology
Dynamic bus sizing for 8-, 16-, and 32-bit buses
— Energy management capability provides an
excellent base for energy-efficient design
— Works with a variety of energy-efficient,
power-managed devices
GENERAL DESCRIPTION
The clock-doubled Am486DX2 processor is a high-performance 486 desktop solution that provides optimal
price/performance for high-end 486 power-managed
systems. The Am486DX2 CPU offers superior local bus
graphics performance for Microsoft® Windows®.
1x clock also reduces RF emission and simplifies clock
generation. The input signal is doubled internally to
achieve the maximum 2x operating frequency. The
phases of the core clock are controlled by an internal
Phase Lock Loop (PLL) circuit.
The Am486DX2 processor operates with a 1x clock input. This 1x clock simplifies system design by reducing
the clock frequency required by external devices. The
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# 19200 Rev: D Amendment/0
Issue Date: August 1995
