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This is an example firmware that uses the high speed IOs interfaces on the RTM.  The communication protocol for the high speed IOs is Pretty Good Protocol (PGP).  The PGP link speeds are all configured for 3.125 Gbps. DMA[2:1] are configured as loopback channels. Inbound and outbound DMA[0] channel is connected to a data multiplexer/demultiplexer, which multiplexes the data to/from the different PGP lanes.  Each PGP lane has a data multiplexer/demultiplexer, which multiplexes the data to/from the different PGP virtual channels within a lane.  In between the virtual channel data multiplexer/demultiplexer and the PGP IP core wrapper are FIFOs for buffering.  Also attached to the PGP IP core wrapper is a AXI-Lite PGP monitor, which monitors the status and configures the PGP IP core wrapper.  All the AXI-Lite PGP monitor modules are connected to a AXI-Lite crossbar module.  The AXI-Lite crossbar handles arbitration between the different AXI-Lite slave register module to the AXI-Lite master software register interface.  So that this example doesn't require a RTM, each PGP lane will be configured in loopback module in software. There are a total of 12 high speed PGP links for the DPM and 1 high speed PGP link for the DTM.

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