In this paper, we will introduce a holistic approach for the pin accessibility scoring and routability analysis. For accessibility, the systematic calculator which assigns score for each pin will search the available access points, consider the surrounded router layers, basic design rule and allowed via geometry. Based on the score, the “bad” pins can be found and modified. On pin routability analysis, critical pin points (placing via on this point would lead to failed via insertion) will be searched out for either layout optimization guide or set as OBS for via insertion blocking. By using this pin routability and pin access analysis flow, we are able to improve the library quality and performance.
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Jian Chen, Jun Wang, ChengYu Zhu, Wei Xu, Shuai Li, Eason Lin, Odie Ou, Ya-Chieh Lai, Shengrui Qu, "Pin routability and pin access analysis on standard cells for layout optimization," Proc. SPIE 10588, Design-Process-Technology Co-optimization for Manufacturability XII, 105880D (20 March 2018);