ETX (form factor)

Computer form factors

Name	PCB size (mm)
WTX	356 × 425
AT	350 × 305
Baby-AT	330 × 216
BTX	325 × 266
ATX	305 × 244
EATX (Extended)	305 × 330
LPX	330 × 229
microBTX	264 × 267
NLX	254 × 228
Ultra ATX	244 × 367
microATX	244 × 244
DTX	244 × 203
FlexATX	229 × 191
Mini-DTX	203 × 170
EBX	203 × 146
microATX (min.)	171 × 171
Mini-ITX	170 × 170
EPIC (Express)	165 × 115
ESM	149 × 71
Nano-ITX	120 × 120
COM Express	125 × 95
ESMexpress	125 × 95
ETX/XTX	114 × 95
Pico-ITX	100 × 72
PC/104 (-Plus)	96 × 90
ESMini	95 × 55
Qseven	70 × 70
mobile-ITX	60 × 60
CoreExpress	58 × 65

ETX, standing for Embedded Technology eXtended, is a highly integrated and compact (3.7 x 4.9 in.) (95 x 125 mm) computer-on-module (COM) form factor that can be used in a design application much like an integrated circuit component. Each ETX COM integrates core CPU and memory functionality, the common I/O of a PC/AT (serial, parallel, etc.), USB, audio, graphics, and Ethernet. All I/O signals as well as a full implementation of ISA and PCI buses are mapped to four high density, low profile connectors on the bottom side of the module.

ETX boards are available with AMD Geode, VIA, Intel Atom, Pentium, Celeron and Core Duo processors.

XTX offers an 75% pin-compatible upgrade path to ETX standard. XTX drops the ISA bus and adds PCI-Express, SATA, and LPC.

COM Express was released in 2005 from PICMG.

Evolution of the ETX standard

One of the fastest-growing concepts in the embedded world is the "Computer-On-Module" or COM. One of the principal COM implementations available in the market is the Embedded Technology eXtended (ETX) specification, first developed by Kontron (formerly *JUMPtec) in the early 2000.

As technology evolves, the ETX standard has undergone further development in scalability and performance. In April 2006, the members of the ETX Industrial Group released the latest generation of the ETX 3.0 specification. The ETX Industrial Group (www.etx-ig.org) is an independent association of companies and individuals that work to exchange knowledge about ETX, communicate with users of the ETX world, monitor trends and ensure the ETX standard fulfills the market’s needs. Membership is open to companies all over the world who develop and produce ETX modules. Members of the ETX Industrial Group include Kontron Embedded Modules GmbH, Advantech, MSC Vertriebs GmbH, ADLINK Technology Inc., Avalue Technology Inc., SECO Srl, Arbor Technology Corp., Axiomtek Co., Blue Chip Technology, AAEON Technology Inc., AEWIN Technologies Co., IBase, Honeywell – CMSS and Portwell.

To obtain a copy of the ETX 3.02 specification, visit the ETX Industrial Group website http://www.etx-ig.org .

	ETX	XTX	COM Express
Dimensions	95 × 114 mm	95 × 114 mm (ETX footprint)	110 ×155 (extended) 95 × 125 mm (basic) 95 x 95 (compact)
Legacy1 support	Full legacy	Legacy except ISA	Legacy except ISA
PCI Express support	-	4 Lanes	up to 6 Lanes (basic)
PCI Express Graphic support	-	-	up to 16 Lanes
Ethernet support	10/100	10/100	10/100/1000
IDE support	2 IDE, 2 SATA2	2 IDE, 4 SATA	IDE, 4 SATA
LPC support	-	yes	yes
USB support	4 USB	6 USB	8 USB
Audio support	Line In/Out, Mic	AC'97, Line In/Out, Mic	AC'97, Line In/Out, Mic, AC'97 digital, HDA
Power	5V, 5VSB	5V, 5VSB	12V, 5VSB
Notes: "Legacy" is defined as the older PC peripherals and bus, such as ISA bus, RS-232 serial, IEEE 1284 parallel, floppy, and PS/2 keyboard & mouse. ETX 3.0 adds SATA via a topside connector on the board.

Mandatory features:

• Connector X1: PCI bus, USB Audio
• Connector X2: ISA BUS
• Connector X3: VGA, LCD, Video, COM 1, COM2, LPT/Floppy, IrDA, Mouse, Keyboard
• Connector X4: IDE 1, IDE 2, Ethernet, miscellaneous
• SATA: Two ports via connector on the top side (as of version 3.0)

External links

ETX at the Open Directory Project

• http://www.etx-ig.org ETX Industrial Group
• ETX Specification V3.02
• ETX Design Guide
• ETX 3.0: SATA integration overview - PC/104 and Small Form Factors