User`s guide

Introduction • 5
1.3.1 CompactPCI Bus Interface
The cPCI-6765(A) operates in a 6U CompactPCI system. The CompactPCI
standard is electrically identical to the PCI local bus standard but has been
enhanced to work in harsh environments and support more peripheral slots.
Additionally, when used in a Hot Swap compliant backplane and in
accordance with the CompactPCI Hot Swap Specification, PICMG 2.1,
Version 1.0, the cPCI-6765(A) supports hosting hot swappable peripherals
in a powered system. The cPCI-6765(A) can also function in a standard
(non-Hot Swap) CompactPCI system without live insertion and extraction
capability.
1.3.2 PCI-to-PCI Bridge (P2P)
The cPCI-6765 features one non-transparent PCI-to-PCI bridge to support
the J1 CompactPCI buses. The Intel 21555 is compliant with the PCI Local
Bus Specification, Revision 3.0. Each bridge provides the isolation,
arbitration, and clocks for seven PCI peripheral cards without the need for an
external bridgeboard. The PCI-to-PCI Bridge is only available with the
cPCI-6765 version. Refer to Appendix B for full application details of this chip
Special features of the Intel 21555 include:
- 33 MHz PCI bus operation
- Support for independent primary and secondary PCI clocks
- 32-bit PCI non-transparent operation with 32-bit devices from one bus
segment to another
- Supports both 5V and 3.3V signaling
1.3.3 Mobile Intel Pentium III Processor
The cPCI-6765(A) uses the Mobile Intel Pentium III Processor. This
0.18-micron product is a highly integrated assembly containing an Intel
Pentium III mobile processor and its immediate system-level support. This
mobile version of the Pentium III processor runs at a lower voltage than the
desktop version.
The 256 KB on-die transfer L2 cache is integrated with the CPU, eliminating
the need for separate components and improving performance. The Mobile
Intel Pentium III Processor also operates with a 100 MHz Front Side Bus for
faster access to memory and data.