The NoC compiler is invoked when the design is validated in IP integrator
(validate_bd_design). NMU/NSU locations can be
constrained as discussed in Constraining NMU/NSU Locations. Unless NMU/NSU locations
have been physically constrained, the NoC compiler arbitrarily assigns locations to the
endpoints.
The NoC Compiler is also invoked during the placement phase of the design. The NoC Compiler is run after the placer has placed the endpoints not already constrained and attempts to satisfy the QoS requirements.