Patent ID: 8438529

Claim:
A computer-based method for checking signal transmission lines of a printed circuit board (PCB) layout, the method comprising: identifying differential pairs in a currently run PCB layout according to an information file for the currently run PCB layout by using a computer; checking whether any signal transmission line is routed between switching vias of each of the differential pairs according to the information file for the currently run PCB layout by using the computer; displaying a routing error window to display information of each signal transmission line routed between the switching vias of one of the differential pairs by using the computer; marking each signal transmission line routed between the switching vias of one of the differential pairs in the currently run PCB layout by using the computer; and wherein the information file corresponding to the currently run PCB layout comprises information for defining types of signal transmission lines, information for determining which via each signal transmission line is connected to, and information for determining whether any transmission line is routed between vias.