Hierarchical Constraints - 2025.2 English - UG1079

When creating complex graphs with multiple subgraph classes or instances, you can apply location constraints to each kernel or port instance individually. Apply these constraints during subgraph instantiation instead of during the definition. In this case, you need to specify the graph qualified name of that kernel instance or kernel port instance in the constraint as shown in the following example. Ensure kernels or their ports being constrained as described previously are defined as public members of the subgraph.

class ToplevelGraph : public adf::graph {
 public:
  indep_nodes_graph1<1,2,3,2> mygraph;
  adf::port<adf::input> datain[2] ;
  adf::port<adf::output> dataout[2] ;

  ToplevelGraph() {
    for (int i = 0; i < 2; i++) {
      adf::connect(datain[i], mygraph.datain[i]);
      adf::connect(mygraph.dataout[i], dataout[i]);

      // hierarchical constraints
      adf::location<adf::stack>(mygraph.kr[i]) = adf::bank(3, 2+i, 2);
      adf::location<adf::buffer>(mygraph.kr[i].out[0]) = adf::location<adf::kernel>(mygraph.kr[i]);
    }
  };
};

v++ -c --mode aie --constraints Work/temp/graph_aie_mapped.aiecst src/graph.cpp

To reuse FIFO location constraints, use aie_routed.aiecst file.

v++ -c --mode aie --constraints Work/temp/graph_aie_routed.aiecst src/graph.cpp