Wiring pattern decision method considering electrical length and multi-layer wiring board

A method for determining a wiring pattern of a signal line for connection of a circuit on a multilayer printed wiring board, comprising the steps of:

• providing a constraint of an electrical length which said signal line must satisfy;
• determining an electrical length change at a bend between wiring elements which are straight parts of a wiring pattern;
• determining a wiring route of said signal line;
• calculating an electrical length of said signal line with use of a wiring length of said signal line and said determined electrical length change;
• judging whether or not said calculated electrical length satisfies said electrical length constraint given to said signal line;
• and
• determining said wiring route as a wiring pattern when the electrical length constraint is satisfied as said decision result.

A program for wiring of a signal line for causing a computer to be executed to connect a circuit on a multi-layer printed wiring board, comprising the steps of:

• providing an electrical length constraint which said signal line must satisfy;
• determining an electrical length change at bend between wiring elements which are straight parts of a wiring pattern;
• calculating an electrical length of said signal line with use of a wiring length of said signal line and said determined electrical length change;
• and
• determining a wiring route in such a manner that said calculated electrical length satisfies said electrical length constraint given to said signal line.

A program for decision of a wiring pattern of a signal line for causing a computer to be executed to connect a circuit on a multi-layer printed wiring board, comprising the steps of:

• providing an electrical length constraint which said signal line must satisfy;
• determining an electrical length change at a bend between wiring elements which are straight parts of a wiring pattern;
• determining a wiring route of said signal line;
• calculating an electrical length of said signal line with use of a wiring length of said signal line and said determined electrical length change;
• deciding whether or not said calculated electrical length satisfies said electrical length constraint given to said signal line;
• and
• determining said wiring route as a wiring pattern when the electrical length constraint is satisfied as a result of said decision.