The subgraph DL64A32L is a 64-antenna-32-layer downlink subgraph. Review the graph definition in the src/inc/subsys.h. It consists of eight bfCascadingChain subgraphs of length four beamforming kernels. This subgraph has four data input ports and 32 coefficient input ports. All eight chains get the same input data. Each chain gets four of the coefficient input ports each. There are eight output data ports for the output of each chain.