The Radix-2 Burst I/O architecture uses one Radix-2 butterfly processing engine (see the following figure). After a frame of data is loaded, the input data stream must halt until the transform calculation is completed. Then, the data can be unloaded. As with the Radix-4 Burst I/O architecture, data can be simultaneously loaded and unloaded when the output samples are in bit reversed order. This solution supports point sizes from 8 to 65536. Both the data memories and phase factor memories can be in either block RAM or distributed RAM (the latter for point sizes less than or equal to 1024).
Figure 1. Radix-2 Burst I/O
