A diagram of the input interface is shown in Figure 2. The input window size to the DDC of one antenna is set to 512 samples long with eight extra words reserved for the configuration which specifies the carrier configuration ID and central frequencies of the carriers. The 512 input sample is stored in natural order to minimize buffering on the programmable logic side; however, interleaving is performed by the AI Engine to improve the efficiency of the HBF47 decimation filter.