By Larry Desjardin, Modular Methods
This month, the AXIe Consortium released a specification named “Wide PCIe”, expanding the lane width, and associated data throughput, to or from an AXIe module. Previously, all PCIe (PCI Express) fabrics were a maximum of four lanes wide. Wide PCIe allows a module to support up to either 8 or 16 lanes of PCIe in each direction. Wide PCIe is a preliminary specification posted on the AXIe Consortium website in slide format. It will be formally integrated into the next revision of the
The “Wide PCIe” specification is straightforward. The AXIe Consortium had previously reserved pins at each slot for expanding the PCIe lane width. In the parlance of AXIe and AdvancedTCA, modules were only allowed to use Fabric Channel 1, a four-lane PCIe bus, but other fabric channels were reserved. The new specification now allows Fiber Channels 2, 3, and 4 to transport data as well, allowing up to 16 lanes of transit in each direction.
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