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system's fabric-switched Link Ports A and B, and can be inserted into system or peripheral slots. The cPB-
4612 is keyed for insertion into compatible slots.
The "CompactPCI" topic in Appendix D contains a link to the PCI Industrial Computer Manufacturers Group.
1.3.2 Processor
The cPB-4612 uses the Mobile Pentium M in a micro FCBGA package. The 1MB or 2MB on-die transfer L2
cache is integrated with the CPU, eliminating the need for separate components and improving
performance. The FCBGA package Pentium M processor also operates with a 400 MHz Processor Side
Bus for very fast access to memory and data.
The "Mobile Pentium M (FCBGA Package)" topic in Appendix D contains a link to the datasheet for the
processor.
1.3.3 Chipset
The Intel 855GME chipset consists of two controller hubs. The 855GME Memory Controller Hub (MCH)
supports a 400MHz system bus, DDR200/266/333 memory, and an integrated graphics solution w/Intel
Extreme Graphics 2 technology. The 6300ESB I/O Controller Hub (ICH4) makes a direct connection to the
memory for faster access to peripherals. It provides the features and bandwidth required for applied
computing-usage models. The following is a list of features of the 855GME chipset:
• Designed, validated, and optimized for the Intel Pentium M with NetBurst™ micro-architecture
using proven and established building blocks
• 400MHz system bus delivers a high-bandwidth connection between the Intel Pentium M and the
platform, providing 3x the bandwidth over platforms based on Intel® Pentium® III processors
• USB controllers provide high performance peripherals with 480Mbps of bandwidth. This results
in a significant increase over previous integrated 1-4 port hubs at 12Mbps
• Dual UARTs
• Serial ATA
• 64bit/66Mhz PCI-X bus
• 32bit/33Mhz PCI bus
• Dual Ultra ATA/100 controllers, coupled with the Intel
®
Application Accelerator - a performance
software package - support faster IDE transfers to storage devices
• The Intel® Application Accelerator software provides additional performance over native ATA
drivers. The Intel Application Accelerator improves system performance by improving I/O
transfer rates and enables faster O/S load time resulting in accelerated boot times
• Embedded lifecycle support
The "Intel 855GME Chipset" topic in Appendix D contains a link to information about the chipset.
1.3.4 PCI-to-PCI Bridge
The cPB-4612 has a 64bit/66Mhz PCI-X bridge to the CompactPCI backplane. The bridge will configure
itself as a transparent bridge when the board is in a system slot, so that the cPB-4612 can be the system
host. If the cPB-4612 is placed in a peripheral slot, the bridge configures itself as a non-transparent bridge,
and will show up as a PCI device to the host. This allows use of the board in either a system or peripheral
slot.