The example design above is generated when the DMA Interface Selection option is set to AXI Stream with Completion in the Basic tab. In this mode, the AXI-ST H2C interface is connected to a data checker, and the AXI-ST C2H interface is connected to data generator and CMPT interface is connected to Completion generator module. But this example design can also be used as a streaming loopback design.
Set the Example design register C2H_CONTROL_REG (0x008) bit to 1 to turn this example design into a streaming loopback design. The example design then takes H2C streaming packets and loops them back to the C2H Streaming interface. Completion packets are generated from the loopback design.