Abstract: A method for operating a data processing system to simulate a circuit that includes a plurality of circuit devices connected by interconnects. A layout description of the circuit is provided in which the devices are connected by interconnects. Each interconnect is associated with a line definition that includes a physical description of an interconnect between two of the circuit devices and a simulation model to be used in simulating the interconnect during simulations of the circuit. The line definitions are user selectable from a list of available line definitions. A circuit netlist is generated by reading physical interconnects from the layout. At least one of the interconnects is replaced by a plurality of transmission line devices, each device being associated with the simulation model included in the line definition. The circuit is then simulated using the netlist.

Abstract: A method for operating a data processing system to simulate a circuit that includes a plurality of circuit devices connected by interconnects. A layout description of the circuit is provided in which the devices are connected by interconnects. Each interconnect is associated with a line definition that includes a physical description of an interconnect between two of the circuit devices and a simulation model to be used in simulating the interconnect during simulations of the circuit. The line definitions are user selectable from a list of available line definitions. A circuit netlist is generated by reading physical interconnects from the layout. At least one of the interconnects is replaced by a plurality of transmission line devices, each device being associated with the simulation model included in the line definition. The circuit is then simulated using the netlist.

Abstract: A method for operating a computer system to generate a layout of a device and a computer-readable medium containing instructions that cause a computer system to carry out that method are disclosed. The computer system has a display that includes a display area. The computer system provides a list of objects and creates user selected objects from the list for inclusion in the display area. The computer assigns one of a plurality of operating modes for each connectivity object in the layout. The computer generates a Net assignment for each connectivity object that is not forced to have a specific Net assignment and for which automatic assignment of a Net is allowed. The computer generated assignment depends on the operating mode associated with that connectivity object. The operating mode of at least one of the connectivity objects can be altered by input from a user of said computer system.