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*
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Information in this document is provided in connection with Intel products. Intel assumes no liability whatsoever, including infringement of any patent or
copyright, for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products. Intel retains the right to make
changes to these specifications at any time, without notice. Microcomputer Products may have minor variations to this specification known as errata.
December 1995
COPYRIGHT
INTEL CORPORATION, 1995
Order Number: 231630-011
Intel386
TM
DX MICROPROCESSOR
32-BIT CHMOS MICROPROCESSOR
WITH INTEGRATED MEMORY MANAGEMENT
Y
Flexible 32-Bit Microprocessor
D 8, 16, 32-Bit Data Types
D 8 General Purpose 32-Bit Registers
Y
Very Large Address Space
D 4 Gigabyte Physical
D 64 Terabyte Virtual
D 4 Gigabyte Maximum Segment Size
Y
Integrated Memory Management Unit
D Virtual Memory Support
D Optional On-Chip Paging
D 4 Levels of Protection
D Fully Compatible with 80286
Y
Object Code Compatible with All 8086
Family Microprocessors
Y
Virtual 8086 Mode Allows Running of
8086 Software in a Protected and
Paged System
Y
Hardware Debugging Support
Y
Optimized for System Performance
D Pipelined Instruction Execution
D On-Chip Address Translation Caches
D 20, 25 and 33 MHz Clock
D 40, 50 and 66 Megabytes/Sec Bus
Bandwidth
Y
Numerics Support via Intel387
TM
DX
Math Coprocessor
Y
Complete System Development
Support
D Software: C, PL/M, Assembler
System Generation Tools
D Debuggers: PSCOPE, ICE
TM
-386
Y
High Speed CHMOS IV Technology
Y
132 Pin Grid Array Package
Y
132 Pin Plastic Quad Flat Package
(See Packaging Specification, Order
Y
231369)
The Intel386 DX Microprocessor is an entry-level 32-bit microprocessor designed for single-user applications
and operating systems such as MS-DOS and Windows. The 32-bit registers and data paths support 32-bit
addresses and data types. The processor addresses up to four gigabytes of physical memory and 64 terabytes
(2
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46) of virtual memory. The integrated memory management and protection architecture includes address
translation registers, multitasking hardware and a protection mechanism to support operating systems. Instruc-
tion pipelining, on-chip address translation, ensure short average instruction execution times and maximum
system throughput.
The Intel386 DX CPU offers new testability and debugging features. Testability features include a self-test and
direct access to the page translation cache. Four new breakpoint registers provide breakpoint traps on code
execution or data accesses, for powerful debugging of even ROM-based systems.
Object-code compatibility with all 8086 family members (8086, 8088, 80186, 80188, 80286) means the
Intel386 DX offers immediate access to the world’s largest microprocessor software base.
231630–49
Intel386
TM
DX Pipelined 32-Bit Microarchitecture
Intel386
TM
DX and Intel387
TM
DX are Trademarks of Intel Corporation.
MS-DOS and Windows are Trademarks of MICROSOFT Corporation.