Analog Placement Constraint Extraction and Exploration with the Application to Layout Retargeting

Analog Placement Constraint Extraction and Exploration with the Application to Layout Retargeting
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模拟布局约束提取和探索及其在布局重定向中的应用

DOI:
10.1145/3177540.3178245
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发表时间:
2018
期刊:
Proceedings of the 2018 International Symposium on Physical Design
影响因子:
--
通讯作者:
Pan, David Z.
Pan, David Z.
中科院分区:
--
文献类型:
--
作者:
Xu, Biying;Basaran, Bulent;Su, Ming;Pan, David Z.

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在模拟/混合信号(AMS)集成电路(IC)中,大部分的版图设计工作仍然是手工处理的,这是耗时且容易出错的。鉴于先前的高质量手动布局包含有经验的设计师的宝贵设计专业知识,从现有布局中探索布局设计约束是可取的。在本文中,我们提取和探索模拟布局的限制,从以前的质量批准的布局,包括规则性和对称性(孤岛)的约束。首次提出了一种有效的基于扫描线的算法来全面提取给定模拟布局中的规则性约束,该算法不仅可以提高布线能力,而且可以最大限度地减少布局寄生引起的电路性能下降。此外,我们提出了一种新的布局技术迁移和性能重定位框架,在那里我们应用约束提取算法,以提高布局质量,同时保留以前的设计经验。实验结果表明,所提出的技术可以保持对称性和规则性的约束,也减少了平均7.6%的布局面积。
In analog/mixed-signal (AMS) integrated circuits (ICs), most of the layout design efforts are still handled manually, which is time-consuming and error-prone. Given the previous high-quality manual layouts containing valuable design expertise of experienced designers, exploring layout design constraints from the existing layouts is desirable. In this paper, we extract and explore analog placement constraints from previous quality-approved layouts, including regularity and symmetry (symmetry-island) constraints. For the first time, an efficient sweep line-based algorithm is developed to comprehensively extract the regularity constraints in a given analog placement, which can not only improve routability but also minimize the layout parasitics-induced circuit performance degradation. Furthermore, we propose a novel layout technology migration and performance retargeting framework, where we apply the constraint extraction algorithms to improve the placement quality while preserving previous design expertise. Experimental results show that the proposed techniques can preserve the symmetry and regularity constraints, and also reduce the placement area by 7.6% on average.
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