The data interface between the RF-DAC tiles and the PL is implemented using parallel data streams, using the AXI4-Stream protocol. These data streams are input to gearbox FIFOs that provide a flexible interface between the user application and the RF-DAC tile. The maximum interface width is 256 bits per stream, representing up to 16 16-bit little endian words. The data streams and associated FIFOs have a configurable number of words which provide the flexibility to choose between the number of words and the clock frequency to interface with the PL design. There are four streams per tile, and the naming convention is sXY_axis, where X represents the RF-DAC tile number, and Y represents a stream input to the FIFO in that tile. The following figure shows the interfaces.
Figure 1. RF-DAC Data Interfaces