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1 Introduction
COM Express™ Concept
COM Express™ is an open industry standard defined specifically for COMs (computer on modules). Its creation makes it possible to smoothly
transition from legacy interfaces to the newest technologies available today. COM Express™ modules are available in following form factors:
•
Mini 84 mm x 55 mm
•
Compact 95 mm x 95 mm
•
Basic 125 mm x 95 mm
•
Extended 155 mm x110 mm
The COM Express Specification Rev 2.1 currently defines seven different pinout types. These are shown in the table below.
Table 1 Types of COM Express™ Pinouts/Features
Types Connector Rows PCI Express Lanes PCI IDE Channels LAN ports
Type 1 A-B Up to 6 1
Type 2 A-B C-D Up to 22 32-bit 1 1
Type 3 A-B C-D Up to 22 32-bit 3
Type 4 A-B C-D Up to 32 1 1
Type 5 A-B C-D Up to 32 3
Type 6 A-B C-D Up to 24 1
Type 10 A-B Up to 4 1
conga-MA5 modules use the Type 10 pinout definition. They are equipped with single 220-pin high performance connector that ensure stable
data throughput.
The COM (computer on module) integrates all the core components and is mounted onto an application specific carrier board. COM modules
are legacy-free design (no Super I/O, PS/2 keyboard and mouse) and provide most of the functional requirements for any application. These
functions include, but are not limited to, a rich complement of contemporary high bandwidth serial interfaces such as PCI Express, Serial ATA,
USB 3.0, and Gigabit Ethernet. The Type 10 pinout provides the ability to offer PCI Express, Serial ATA, and LPC options thereby expanding
the range of potential peripherals. The robust thermal and mechanical concept, combined with extended power-management capabilities, is
perfectly suited for all applications.
Carrier board designers can use as little or as many of the I/O interfaces as deemed necessary. The carrier board can therefore provide all
the interface connectors required to attach the system to the application specific peripherals. This versatility allows the designer to create a
dense and optimized package, which results in a more reliable product while simplifying system integration. Most importantly, COM Express™
modules are scalable, which means once an application has been created there is the ability to diversify the product range through the use
of different performance class or form factor size modules. Simply unplug one module and replace it with another, no redesign is necessary.