PCIe/104 Stacking Rules

One or two 1629 Coaxlink Duo PCIe/104-EMB or 1634 Coaxlink Duo PCIe/104-MIL modules can be stacked directly under the Host PC.

The Host PC must be equipped with one stack-down connector of the following types:

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Type 2 PCIe/104 with 2 PCI Express x4 links providing four active lanes.

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Type 1 PCIe/104 with 1 PCI Express x16 link configured to operate as 2 x8 links providing at least four active lanes per link.

Note: According the PCIe/104 specification, a Type 1 PCIe/104 host PC that supports a PCIe x16 link is not required to support two x8, or two x4 links. For such PCs, only one module can be stacked underneath!

PCIe/104 stack with a Type 1 Host PC and 2 modules.

PCIe/104 stack with a Type 2 Host PC and 2 modules.

Each module:

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Uses only 4 PCI Express lanes.

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Routes to the next module the 4 unused PCI Express x1 links.

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Shifts by 8 positions and routes to the next module the lowest 8 lanes of the PCI Express x16 link.

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Re-drives the clock of the Type 1 PCI Express x16 or the Type 2 PCI Express x4 links.