ETX (form factor)

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ETX, standing for Embedded Technology eXtended, is a highly integrated and compact 95 × 125 mm (3.7 × 4.9 in) 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 a 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[edit]

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 ( 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 Tecnologies IBase, Honeywell – CMSS and Portwell.

Dimensions 95 × 114 mm (3.7 × 4.5 in) 95 × 114 mm (3.7 × 4.5 in) (ETX footprint)
  • 110 × 155 mm (4.3 × 6.1 in) (extended)
  • 95 × 125 mm (3.7 × 4.9 in) (basic)
  • 95 × 95 mm (3.7 × 3.7 in) (compact)
  • 55 × 84 mm (2.2 × 3.3 in) (mini)
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
  1. "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.
  2. 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[edit]