Caple CM109 User Manual download pdf (Page 28)

20 CMX34GS cpuModule BDM-610000082 Rev A

Selecting the Stack Order for the CMX34GS

There are several things to consider when selecting the order of boards in the stack. Before selecting the order,

be sure to determine which bus connector on each board is the “Active” bus. Typically, if a peripheral module has

both PCIe and PCI bus connectors, only the PCIe is active and the PCI is pass-through. The following is a list of

rules to use to determine the stack order:

1. The PCIe connectors above and below the CPU have completely separate signals. Therefore it is

possible to attach boards to the PCIe connector above and below the CPU.

2. Any board that uses a PCIe or SATA link must be within six boards of the CPU.

3. To preserve power integrity, it is recommended that there be no more than six boards between the CPU

and the power supply.

4. In order to maintain maximum performance over the full temperature range, it is recommended that

a PCIe spacer be used between the CPU and any board immediately above it.

5. A maximum of four PCI boards may be attached to any PCI bus.

6. The PCIe to PCI bridge (if one exists in the stack) must be at one end of the PCI bus segment, and all of

the peripheral cards at the other end. There may be up to eight PCI pass-through connectors between

the PCIe to PCI bridge and the peripheral cards.

7. There must be no more than two boards between the first PCI peripheral and the last PCI peripheral.

If there are four PCI peripheral cards in a PCI bus segment, there may not be any PCI pass-through

connections between them.

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Caple CM109 User Manual Page 28