1. A method of modeling an integrated circuit design, an integrated circuit having the integrated circuit design being operable to perform intended functions, the method comprising: creating a register transfer level design of the integrated circuit, the register transfer level design including an untimed net, wherein the register transfer level design further includes a functional macro connected to the untimed net; associating a timing parameter to the untimed net; and creating a physical design of the integrated circuit based on the register transfer level design, wherein the register transfer level design includes a physical component and the untimed net, and wherein the physical component corresponds to the functional macro and is connected to the untimed net.