ADLINK Express-CBR - Manual (Page 7)

Express-CBR Reference Manual 3
Chapter 2 Product Overview
This introduction presents general information about the COM Express™ architecture and the Express-CBR
Computer-On-Module (COM). After reading this chapter you should understand:
• COM Express concept
• COM Express architecture
• Express-CBR features
• Express-CBR functional block diagram
• Express-CBR major components
• Express-CBR connectors
• Express-CBR specifications
COM Express Concept
COM Express is an open industry standard defined specifically for COMs (Computer On Modules). Its
creation provides the ability to make a smooth transition from legacy parallel interfaces to the newest
technologies based on serial buses available today. COM Express modules are available in the following
form factors:
• Compact 95mm x 95mm
• Basic 125mm x 95mm
• Extended 155mm x 110mm
The COM Express specification 1.0 defines five different pinout types.
The Express-CBR utilizes the Type 2 pinout definition, equipped with two high performance connectors that
ensure stable data throughput.
The COM (Computer On Module) integrates all the core components and is mounted onto an application
specific baseboard. COM modules are legacy-free designs (no Super I/O, PS/2 keyboard, and PS/2 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 2.0, and Gigabit Ethernet. The Type 2 pinout provides the ability to offer 32-bit PCI, Parallel
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.
Baseboard designers can utilize as little or as many of the I/O interfaces as necessary. The baseboard 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 modules. Simply unplug one module and
replace it with another. No redesign is necessary.
Table 2-1. COM Express Pinout Types
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