You can enter part of your design in a form other than schematics, such as text entry or a RAM or ROM description. You can also bring in netlist files produced by interface software other than Mentor Graphics. Whatever the form of entry, the starting point for inclusion into a Mentor Graphics schematic design must be a netlist file in EDIF format. EDIF netlist files must be located in the working directory. Without the EDIF file, this portion of the design cannot be included; with it, the origin of the logic becomes irrelevant. To incorporate the EDIF file into your schematic, you must create a symbol for the file and place it on your schematic as you would any other component.