| 摘要 |
A designing method of a semiconductor device having a first wire and a second wire with a plurality of vias includes determining a first life time change rate of the semiconductor device in response to a change in a number of via column, a second life time change rate of the semiconductor device in response to a change in a number of via row, reducing the number of via column according to a ratio based on the first life time change and the second life time change; and increasing the number of via row at least one.
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