Abstract: A system may provide a placeholder for a component in a block of a first-level integrated circuit design without wiring at least one port of the component. The system may determine a mapping to a provider interface in the block. The system may invoke an integrated circuit generator to generate a second-level integrated circuit design based on the first-level integrated circuit design. The generator when executed replaces the provider interface with the component including wiring ports of the component, including the at least one port, in the second-level integrated circuit design according to the mapping. In some implementations, an application program interface may enable a provider to communicate with the generator. The provider can utilize the API to instantiate the provider interface and determine the mapping.