Abstract: A wiring route deciding system, for a wiring board containing a multi-pin part, includes an input unit for receiving wiring board and wire connection information, wiring constraint information and wiring setting information, for example. The system further contains a draw wiring processing unit which decides a wiring route of a draw wiring from a part pin to a part periphery boundary based on wiring information inputted by the input unit, an inter-draw wire wiring processing unit which decides the wiring route taken between end points of the draw wiring decided by the draw wiring processing unit, and an output unit which outputs a wiring route information based on that decided by both the draw wiring processing unit and the inter-draw wire wiring processing unit. There is also provided a method counterpart for a wire routing scheme for a wiring board containing a multi-pin part.

Abstract: By deciding a draw wiring route from a part to eliminate an intersection of wire connections generated by the part direction and the terminal arrangement order, it is possible to reduce the wiring layer used and increase the mounting density. Draw wiring processing from terminals of parts is performed prior to the entire wiring processing. In order to optimally perform the draw wiring processing, the parts connected to an object to be wired are moved onto a virtual wiring board and wiring processing is performed there. When moving a part from the real wiring board, an area around the part is cut out from the real wiring board and moved onto the virtual wiring board. On the virtual wiring board, the part direction is rotated and parallel-displaced to arrange it in the optimal state for the wiring to decide the draw wiring direction and perform wiring between the respective terminals.