Intel 80386EX

Short description: Type of microprocessor

An Intel i386 EX embedded processor inside a Garmin GPS III+

The Intel i386EX (80386EX) is a variant of the Intel 386 microprocessor designed for embedded systems. Introduced in August 1994 and was successful in the market, being used aboard several orbiting satellites and microsatellites.

Intel's previous x86 CPU for the embedded market was the Intel 80186. Like the 80186, the 80386EX integrates several peripherals including a timer, DMA controller, and interrupt controller. This vastly reduces the number of system components required for implementing a 80386EX-based system. Unlike the 80186, the peripherals of the 80386EX are compatible with standard PC/AT components.

Intel did not manufacture another integrated x86 processor until 2007, when it confirmed the Enhanced Pentium M-based Tolapai (EP80579).[1]

## Contents

* 1 Characteristics
* 2 See also
* 3 References
* 4 External links

## Characteristics

* Introduced August 1994
* Variant of 80386SX intended for embedded systems
* 26-bit memory addressing for up to 64 MiB of DRAM
* 16-bit data bus, limiting performance but reducing system cost
* Static core, i.e. may run as slowly (and thus, power efficiently) as desired, down to full halt
* Support for System Management Mode[2]
* On-chip peripherals:
* clock and power management
* timers/counters
* watchdog timer
* serial I/O units (synchronous and asynchronous) and parallel I/O
* DMA
* RAM refresh
* JTAG test logic
* Significantly more successful than the 80376
* Used aboard several orbiting satellites and microsatellites
* Used in NASA's FlightLinux project
* Used in USRobotics Courier I modem V.everything (Internal ISA and External RS232 ISDN Terminal Adapters with 56KBPS analog remote access server).
* Used in Ericsson R290 and Globalstar/Qualcomm GSP-1600 satellite phone.[3]
* Used in many older Garmin GPS units, such as the GPS 48, II, III, and 12.[4][5]
* Used in Akai S5000 & S6000 digital samplers.
* Used in Nokia 9000 Communicator phone.[6][7]
* Used in Swarco ITC-2 traffic light controller.
* Used in Sperry Marine Navigat X MKI/MKII gyro compasses.
* Used in Gallagher/Cardax FT 3000
* Used in Videokê/intermagic karaokês
* Used in Ziton ZP3 Fire Alarm control panel

## See also

* Intel 80186/Intel 80188
* Intel 80376
* Intel Timna
* Atom (system on chip)
* Intel Quark

## References

1. ↑ "Intel confirms details of Tolapai, a SoC embedded processor". 30 August 2007. https://arstechnica.com/hardware/news/2007/08/intel-confirms-details-of-tolapai-a-soc-embedded-processor.ars.
2. ↑ (PDF) 80386EX Embedded Microprocessor User's Manual. Intel Corporation. February 1995. http://www.bitsavers.org/components/intel/80386/272485-001_80386EX_Users_Manual_Feb95.pdf. Retrieved 2025-11-04.
3. ↑ (in en) EEVblog #721 - Globalstar Satellite Phone Teardown, 4 March 2015, https://www.youtube.com/watch?v=uyr1ICZxJYI, retrieved 2021-09-05
4. ↑ "Don't Trash that Old Garmin 48 GPS!". 13 April 2010. http://www.practical-sailor.com/blog/Dont_Trash_that_Old_Garmin_48_GPS-10090-1.html.
5. ↑ "Garmin GPS-III+ Backup Battery Replacement". http://www.n7cfo.com/vhf/GPS.pdf.
6. ↑ "Nokia 9000 Communicator - Mobilecollectors.net". https://www.mobilecollectors.net/phone/2644/nokia-9000+communicator.
7. ↑ "Inside a Nokia phone". https://www.mobilecollectors.net/files_large/img_7028_jpg_large.jpg.

## External links

* 386EX characteristics
* [1]

* v
* t
* e

Intel microcontroller]]s (list)

* MCS-48 (8048 family)
* MCS-51 (8051 family)
* MCS-151 (80151 family)
* MCS-251 (80251 family)
* 8061
* MCS-96 (8x196 family)
* MCS-296 (8x296 family)

* v
* t
* e

Intel processors

Discontinued

BCD oriented (4-bit)|

* 4004 (1971)
* 4040 (1974)

pre-x86 (8-bit)|

* 8008 (1972)
* 8080 (1974)
* 8085 (1977)

Early x86 (16-bit)|

* 8086 (1978)
* 8088 (1979)
* 80186 (1982)
* 80188 (1982)
* 80286 (1982)

x87 (external FPUs)|

8/16-bit databus
8087 (1980)
16-bit databus
80187
80287
80387SX
32-bit databus
80387DX
80487

IA-32 (32-bit)|

* 80386
* SX
* 376
* EX
* 80486
* SX
* DX2
* DX4
* SL
* RapidCAD
* OverDrive
* A100/A110
* Celeron (1998)
* M
* D (2004)
* Pentium
* Original P5
* OverDrive
* Pro
* II
* II OverDrive
* III
* 4
* M
* Dual-Core
* some Core
* Solo
* Duo
* Tolapai

x86-64 (64-bit)|

* Celeron
* D
* Dual-Core
* Pentium
* 4
* D
* Extreme Edition
* Dual-Core
* some Core
* 2
* some i7

Other|

CISC
iAPX 432
Itanium
RISC
i860
i960
StrongARM
XScale

Current

IA-32 (32-bit)|

* Atom
* CE
* SoC
* Quark

x86-64 (64-bit)|

* Atom
* CE
* SoC
* Celeron
* Pentium
* Core
* i3
* i5
* i7
* i9
* M
* Xeon
* E3
* E5
* E7
* D
* Phi

Lists

* Celeron
* Pentium
* Pro
* II
* III
* 4
* D
* M
* Core
* Core
* 2
* i3
* i5
* i7
* i9
* M
* Atom
* Xeon
* Itanium

Related

* Tick–tock model
* Chipsets
* GPUs
* GMA
* HD and Iris Graphics
* PCHs
* SCHs
* ICHs
* PIIXs
* Stratix
* Codenames

Microarchitectures

x86|

| P5|

800 nm

600 nm
P54C
350 nm
P54CS
P55C
250 nm
Tillamook

|

P6, Pentium M,
Enhanced Pentium M|

500 nm

350 nm

Klamath
250 nm
Mendocino
Dixon
Tonga
Covington
Deschutes
Katmai
Drake
Tanner
180 nm
Coppermine
Coppermine T
Timna
Cascades
130 nm
Tualatin
Banias
90 nm
Dothan
Stealey
Tolapai
Canmore
65 nm
Yonah
Sossaman

NetBurst|

180 nm
Willamette
Foster
130 nm
Northwood
Gallatin
Prestonia
90 nm
Tejas and Jayhawk
Prescott
Smithfield
Nocona
Irwindale
Cranford
Potomac
Paxville
65 nm
Cedar Mill
Presler
Dempsey
Tulsa

Core|

65 nm
Merom-L
Merom
Conroe-L
Allendale
Conroe
Kentsfield
Woodcrest
Clovertown
Tigerton

45 nm
Penryn
Penryn-QC
Wolfdale
Yorkfield
Wolfdale-DP
Harpertown
Dunnington

Nehalem|

45 nm
Auburndale
Beckton (Nehalem-EX)
Bloomfield
Clarksfield
Gainestown (Nehalem-EP)
Havendale
Jasper Forest
Lynnfield

32 nm
Arrandale
Clarkdale
Gulftown (Westmere-EP)
Westmere-EX

Sandy Bridge|

32 nm
Sandy Bridge
Sandy Bridge-E
Gladden

22 nm
Ivy Bridge
Ivy Bridge-EP
Ivy Bridge-EX

Haswell|

22 nm
Haswell

14 nm
Broadwell

Skylake|

14 nm
Skylake
Kaby Lake (Amber Lake • Whiskey Lake)
Coffee Lake
Cascade Lake
Comet Lake

Palm Cove|

10 nm
Cannon Lake

Sunny Cove|

14 nm
Cooper Lake

10 nm
Ice Lake

Willow Cove|

14 nm
Rocket Lake

10 nm
Tiger Lake
Sapphire Rapids

Golden Cove|

7 nm
Alder Lake
Granite Rapids

Atom|

| Bonnell
Saltwell|

45 nm
Silverthorne
Diamondville
Pineview
Lincroft
Tunnel Creek
Stellarton
Sodaville
Groveland

32 nm
Cedarview
Penwell
Cloverview
Berryville
Centerton

|

Silvermont
Airmont|

22 nm
Valleyview
Tangier
Anniedale

14 nm
Cherryview

Goldmont|

14 nm
Goldmont
Goldmont Plus

Tremont|

10 nm
Tremont
Gracemont

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