Specifications

Chapter 3. Theory of Operation
6
CompactPCI INTERFACE
CompactPCI is an adaptation of the Peripheral Component Interconnect (PCI) Specification. It has
been optimized for industrial and/or embedded applications that require a more robust mechanical
form factor than desktop PCI. CompactPCI uses industry standard mechanical components and high
performance connector technologies to provide a system well suited for rugged applications.
CompactPCI provides a system that is electrically compatible with the PCI Specification, allowing low
cost PCI components to be used. CompactPCI is an open standard supported by the PICMG (PCI
Industrial Computer Manufacturers Group), which is a consortium of companies involved in utilizing
PCI for embedded applications.
CompactPCI appeals to customers that require the following capabilities:
• PCI performance
• 32- and 64-bit data transfers
• 8 PCI slots per system
• Industry standard software support
• 3U small form factor (100 mm by 160 mm)
• 6U form factor (233 mm by 160 mm)
• Eurocard packaging
• Wide variety of available I/O
CONNECTIVITY
(J1) is a CompactPCI compatible connector providing a complete 32-bit PCI local bus interface.
(J2) is an RJ-45 connector for use with either 10BASE-T or 100BASE-TX Ethernet LANs. Such use
requires Category 5 UTP cable.
COMMON TRANSFORMER
The ZT 6650 incorporates a design that allows the board to use a single transformer for both
10 Mbits/s and 100 Mbits/s Ethernet signals. By implementing a common transformer, the design is
less complex, has greater reliability, and consumes less power.
PHYSICAL LAYER
National Semiconductor's DP83840 or DP83233 provides auto-detection and switching of 10 Mbits/s
or 100 Mbits/s signals. Using NWay™ auto-negotiation, the adapter senses the hub's speed and sets
the adapter to run at either 10 Mbits/s or 100 Mbits/s in either Half Duplex or Full Duplex mode,
depending on the capabilities of the hub.
Important:
Connection to a 100BASE-TX hub for 100 Mbits/s operation requires Category 5
unshielded twisted-pair (UTP) cable. The maximum length from the 100BASE-TX hub to the adapter
is
100 meters
. Connection to a 10BASE-T hub for 10 Mbits/s operation requires a Category 3, 4, or
5 UTP cable.
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