| 摘要 |
Disclosed is an apparatus for performing automatic routing of a semiconductor integrated circuit, including an automatic routing and search processing unit for outputting post-routing layout data upon receiving inputs of post-routing layout data, circuit data and differential-signal information. The automatic routing and search processing unit includes: a differential-signal routing setting unit for designating a signal specified by the differential-signal information from the circuit data, generating dummy terminals, searching for a guide wiring of large line width and performing layout; a wiring path search unit for performing all signal routing inclusive of normal routing while avoiding a power supply wiring and a wiring-inhibited area; a large-to-small line width converter for reducing the line width only of enlarged line width guide wirings specified by differential signals; a differential-signal routing unit for routing differential signals in parallel along locations where the line width of the guide wiring of enlarged line width has been reduced; and a shield routing unit for performing shield routing.
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