3U CompactPCI Pentium-M Single Board Computer

C3PM shown without heatsink


  • CPCI compatible 3U form factor
  • Available with the Ultra Low Voltage 1.0 GHz @ 5.5 W , the Low Voltage at 1.4 GHz @ 10 W
  • 512 M B DDR-267
  • Bootable CompactFlash
  • -40°/+85°C operating temperature versions
  • Also available in rugged, conduction-cooled versions


The C3PM is a 3U CompactPCI compatible platform based on the Intel ® low power Pentium ® M processor. The Pentium M’s low power consumption ideally equips the C3PM for rugged applications. The C3PM is built with no socketed components and an optional full-board heat sink and wedgelocks for operation in high shock/vibration conditions and extreme temperatures.

The 855GME and 6300ESB chipset supports PCI-X expansion to a dual-port 1000BaseTX Ethernet controller, integrated VGA, two USB 2.0 ports, ATA/100, Serial ATA, and two configurable RS232/422 COM ports. On-board CompactFlash permits single-slot booting. Conventional PC I/O is accessible with industry standard connectors on an optional rear I/O module.

All I/O is routed through the J2 backplane connector.


Additional Photos

C3PM Block Diagram

C3PM back view without coldplate

C3RM front with coldplate

C3RM rear with coldplate

C3RM shown with optional RIO module

Technical Specifications

Intel ® Pentium ® M Processor
2 MB of L2 Advanced Transfer Cache
Available in either the Ultra Low Voltage 1.0 GHz @ 5 W Celeron M version or the Low Voltage at 1.4 GHz @ 10 W version

Single-slot Operation Single-slot CompactPCI operation with an on-board CompactFlash disk for bootable mass storage
855GME and 6300ESB Chipset

400 MHz System Bus
Ultra ATA 100/66/33 IDE protocol
PCI-X expansion offers 64 bits @ 66 MHz data transfer capability
Integrated Graphics
Chipset includes DRAM controller, four USB 2.0 ports, two Serial ATA/150 ports, RTC, NV-RAM, standard PC timers, Ultra DMA, and interrupt logic


512MByte of DDR-266 DRAM with a memory bandwidth of 2.1 GB/s


PICMG 2.0 R3.0 Compliant
PLX non-transparent PCI-PCI bridge provides 32-bit CompactPCI transfer rates at 66 MHz
Universal bridge lets the C3RM operate as a system controller or a peripheral slot module
Connector J2 is used for I/O expansion
Supports IPMI


An Intel 82546 Ethernet controller supports two 10/100/1000BaseTX Ethernet ports routed to the J2 connector

855GME provides an integrated 32-bit 3D core at 133 MHz
SVGA is routed to the J2 connector

IDE/CompactFlash Primary IDE port is routed to a separate Type II compatible CompactFlash module that attaches to the cooling plate
BIOS General Software's flash-based system BIOS with a
variety of boot options including CD-ROM, USB, and PXE over Ethernet
Customized versions can be provided
Watchdog Programmable watchdog timer for system recovery
I/O interfaces routed to optional rear plug-in board

COM1/3, Serial ATA, two USB 2.0 ports, two 1000BaseTX Ethernet ports, and VGA are routed through J2

X3PMRIO Optional rear I/O interface board with:
• Small speaker
• DVI-I connector for digital and analog graphics
•Four stacked USB connectors
• 40-pin IDE connector
• Two RJ-45 connectors for Gb Ethernet (as an
alternative to PICMG 2.16)
• Two SATA connectors
• One floppy drive connector
• COM 3 and 4 connectors, individually selectable for RS-232/RS-422
• Fan connectors
Operating temperature

The CPM1 has a standard operating temperature range of -40°/+71° C
-40°/+85°C versions are avaiable at 1.0 GHz or 1.4 GHz

Net Weight TBD
Rugged/Conduction-cooled Versions C3RM is a conduction-cooled version of the CPM1
Wedgelocks provide high shock/vibration immunity per MIL-STD-810F
Convection-cooled and conduction-cooled versions have conformal coating as an option
Power Consumption 5 VDC @ 2 Amps typ
3.3 VDC @ 2 Amps typ  
Pentium M
The Intel® Pentium® M processor was designed from the ground up with a new microarchitecture that delivers high performance with low power consumption. With its 90 nm processing technology and 2 MB of L2 advanced transfer cache, the Pentium M offers more performance per Watt. Second-generation Streaming SIMD Extensions (Streaming SIMD Extensions 2) capability adds 144 new instructions, including 128-bit SIMD integer arithmetic and 128-bit SIMD double-precision floating-point operation. The Pentium. The Pentium M also offers a dedicated hardware stack manager that employs sophisticated hardware control for improved stack management, advanced branch prediction capability, and a 400 MHz front side bus to the memory controller hub.
Chipset and 6300ESB ICH
The Intel® 855GME Graphics Memory Controller Hub (GMCH) and Intel® 6300ESB I/O Controller Hub (ICH) chipset create an optimized integrated graphics solution with a 400 MHz system bus and integrated 32-bit 3D core at 133 MHz.
DRAM Controller
The 855GME (GMCH) provides a 266 MHz interface to DDR RAM (72 bits wide with ECC). The C3PM can be populated with 512 MB of total memory respectively. The GMCH system memory architecture is optimized to maintain open pages (up to 16-kB page size) across multiple rows. As a result, up to 16 pages across four rows is supported. To complement this, the GMCH will tend to keep pages open within rows, or will only close a single bank on a page miss.

Graphics Processor
The 855GME also has an advanced integrated graphical display controller. The C3PM has an VGA port out through the J5 connector to the system backplane.
The 6300ESB I/O Controller Hub (ICH) provides most of the C3PM's on-board I/O and it's the C3PM's PCI-X expansion bridge. The ICH is designed as a low-power, high-performance I/O hub that features:
• 64-bit @ 66 MHz PCI-X expansion that is used on the C3PM for the two Ethernet ports available on the C3PM.
• Two USB 2.0 compliant ports that are routed to the J2 connector to the backplane
• Integrated IDE controller supports Ultra 100 DMA Mode Transfers up to 100 MB/sec read cycles and 88.88 MB/sec write cycles for a CompactFlash drive on-board
•Serial ATA providing 150 MB/sec data rates are also routed through J2
• Standard PC functionality like a battery-backed RTC and 256-bytes of CMOS RAM, Power Management Logic, Interrupt Controller, Watchdog Timer, AC'97 CODEC, Integrated 16550 compatible UART's, and multimedia timers based on the 82C54
Intel 82546EB Dual Gigabit Ethernet Controller
The C3PM supports two 10/100/1000BaseTX channels that are routed to the J2 . The Intel 82546EB Dual Port Gigabit Ethernet Controller incorporates two full Gigabit Ethernet MAC and PHY layer functions on a single, compact component. Routed from the ICH, the front side data path to the dual Ethernet port controller is a 64-bit PCI-X interface at 66 MHz. The Intel 82546EB offers the following features: 10, 100, and 1000BaseTX support with auto-negotiation; Dual 64KB configurable RX and TX packet FIFOs; 128-bit internal data path architecture for low latency data handling and superior DMA transfer rate performance; Built-in Phyceiver

Ordering Information
Part# Description
C3PMxPP 3U convection-cooled CompactPCI with 1.4 GHz Pentium M, 512 MB DDR-267, DVI graphics, compactFlash site
C3RMxPP 3U convection-cooled CompactPCI with 1.4 GHz Pentium M, 512 MB DDR-267, DVI graphics, compactFlash site. 0°/+71°C operation. Special versions for -40°/+85°C
X3PMRIO Rear I/O board for C3PM/CR3M
xxxxRxx 512 MB Flash for CPM1
xxxxSxx 1 GB Flash for CPM1

2 GB Flash for CPM1

xxxxUxx 4 GB Flash for CPM1
xxxxVxx 8 GB Flash for CPM1

Upgrade to 1.8 GHz Pentium M

xxxxxxx-ER Special testing to extended -40°/+85°C operating temperature per thermal profile provided by customer
CONCOAT-XPM Conformal coating


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