NDLI: MCFRoute: A detailed router based on multi-commodity flow method

Content Provider	IEEE Xplore Digital Library
Author	Xiaotao Jia Yici Cai Qiang Zhou Gang Chen Zhuoyuan Li Zuowei Li
Copyright Year	2014
Description	Author affiliation: Tsinghua Nat. Lab. for Inf. Sci. & Technol., Nimbus Autom. Technol., Shanghai, China (Gang Chen; Zhuoyuan Li; Zuowei Li) \|\| Dept. of Comput. Sci. & Technol., Tsinghua Univ., Beijing, China (Xiaotao Jia; Yici Cai; Qiang Zhou)
Abstract	Detailed routing is an important stage in VLSI physical design. Due to the high routing complexity, it is difficult for existing routing methods to guarantee total completion without design rule checking violations (DRCs) and it generally takes several days for designers to fix remaining DRC-s. Studies has shown that the low routing quality partly results from non-optimal net-ordering nature of traditional sequential methods. In this paper, a novel concurrent detailed routing algorithm is presented that overcomes the net-order problem. Based on the multi-commodity flow (M-CF) method, detailed routing problem with complex design rule constraints is formulated as an integer linear programming (ILP) problem. Experiments show that the proposed algorithm is capable of reducing design rule violations while introducing no negative effects on wirelength and via count. Implemented as a detailed router following track assignment, the algorithm can reduce the DRCs by 38%, meantime, wirelength and via count are reduced by 3% and 2.7% respectively comparing with an industry tool. Additionally, the algorithm is adopted as an incremental detailed router to refine a routing solution, and experimental results show that the number of DRCs that industry tool can't fix are further reduce by half. Utilizing the independency between subregions, an efficient parallelization algorithm is implemented that can get a close to linear speedup.
Starting Page	397
Ending Page	404
File Size	730789
Page Count	8
File Format	PDF
ISBN	9781479962785
DOI	10.1109/ICCAD.2014.7001382
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-11-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Routing Mathematical model Metals Wires Equations Industries Algorithm design and analysis DR-C Detailed Routing Multi-commodity Flow Design Rule
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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