Design method of on-board wiring

A design method of on-board wiring in a designed circuit, the method comprising:

• determining a severity as a crosstalk prevention index for a pair of wires based on a generated noise level of a damaging side wire and a permissible noise level of a damaged side wire;
• assigning a severity class (SC) to the pair of wires based on the severity determined for the pair of wires, the SC being pre-defined value ranges for severity classification;
• generating, for a design element of the pair of wires, one or more by-design permissible values belonging to the SC that have been assigned to the pair of wires, based on a preset SC specific permissible value list;
• and
• constructing a layout of the pair of wires on a board based on the by-design permissible value.