1. A method of design, comprising: adding signal path information to a configuration file in a computer system, wherein the signal path information identifies a path in an integrated circuit that has a source in a first clock domain and a destination in a second clock domain, wherein the signal path information further specifies that the path is to include a buffer; and adding one or more timing parameters for the path to the configuration file, wherein the one or more timing parameters specify a propagation delay from the source to the destination; wherein, upon the configuration file being accessed by a simulation tool, the configuration file enables the simulation tool to simulate operations of the integrated circuit, wherein the simulated operations include: the buffer receiving a data signal from the source; the buffer providing the data signal to the destination after the propagation delay has transpired; and the buffer providing an error signal to the destination prior to providing the data signal to the destination.