| 摘要 |
A branching point on a wire is detected in the layout results S 101 . A delay amount of a route with a dummy buffer being inserted on a wire subsequent to the branching point S 102 and that of the route without a dummy buffer being inserted are then calculated S 103 . Based on the delay amounts, an insertion point at which a load-dividing buffer is to be inserted is determined S 104 . On condition that a load-dividing buffer is to be inserted at the insertion point, the drive capability of a driving cell preceding the insertion point is calculated so that timing constraints are satisfied S 105 . Then, after it is confirmed that a load-dividing buffer is insertable at the determined insertion point S 106 , processes of placing a load-dividing buffer, changing the drive capability of the driving cell, and changing wiring information are performed on the layout results S 107.
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