Dynamic Engineering PCIe8LXMCX2 Manuale d'uso - Pagina 12

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Applications Guide

Interfacing

Some general interfacing guidelines are presented below. Do not hesitate to contact the

factory if you need more assistance.

Installation

The XMC's are mounted to the PCIe8LXMCX2 prior to installation within the chassis.

XMC connectors are rated for 50 insertion cycles and putting less rotational stress on

the connectors is a good idea. It is recommended to remove the PCIe bezel to allow

installation vertically onto the mating connectors. [you can leave the bezel in place and

rotate the XMC onto the mating connectors but this will put some side force on the

connectors and is not recommended]. The rear slot does not have the bezel interaction

and can be mounted directly.

Be careful when removing to restrict the amount of rocking used. Slowly walk the board

out of the connector. The connectors are SMT on both sides and undue stress can

fatigue the joints causing premature failure.

There are four mounting locations per XMC. Two into the XMC mounting bezel, and

two for the standoffs near the XMC bus connectors. For proper contact and operation

during vibration it is recommended to use the fasteners.

Start-up

Make sure that the "system" can see your hardware before trying to access it. Many

BIOS will display the PCI devices found at boot up on a "splash screen" with the

VendorID and CardId for the XMC installed and an interrupt level. If the information is

not available from the BIOS then a third party PCI device cataloging tool will be helpful

Watch the system grounds. All electrically connected equipment should have a fail-

safe common ground that is large enough to handle all current loads without affecting

noise immunity. Power supplies and power consuming loads should all have their own

ground wires back to a common point.

Power all system power supplies from one switch. Connecting external voltage to

the PCIe8LXMCX2 when it is not powered can damage it, as well as the rest of the host

system. This problem may be avoided by turning all power supplies on and off at the

same time. This applies more to the XMC's installed onto the PCIe8LXMCX2 than the

Embedded Solutions

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