1. A method in a data processing system of building a simulation model of a digital design, said method comprising: within design data collectively defining a simulation model of said digital design, locating a definition of a configuration construct specifying a relationship between values of one or more configuration latches within said digital design and settings of said configuration construct; and in response to locating said definition of said configuration construct, automatically creating an instrumentation entity within said design data, said instrumentation entity having one or more inputs logically coupled to said one or more configuration latches and one or more outputs for providing signals indicating characteristics of said configuration construct during simulation.