https://scholars.lib.ntu.edu.tw/handle/123456789/341025
Title: | NTUplace3: An analytical placer for large-scale mixed-size designs with preplaced blocks and density constraints | Authors: | Chen, T.-C. Jiang, Z.-W. Hsu, T.-C. Chen, H.-C. YAO-WEN CHANG |
Keywords: | Legalization (LG); Physical design; Placement | Issue Date: | 2008 | Journal Volume: | 27 | Journal Issue: | 7 | Start page/Pages: | 1228-1240 | Source: | IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems | Abstract: | In addition to wirelength, modern placers need to consider various constraints such as preplaced blocks and density. We propose a high-quality analytical placement algorithm considering wirelength, preplaced blocks, and density based on the log-sum-exp wirelength model proposed by Naylor et al. and the multilevel framework. To handle preplaced blocks, we use a two-stage smoothing technique, i.e., Gaussian smoothing followed by level smoothing, to facilitate block spreading during global placement (GP). The density is controlled by white-space reallocation using partitioning and cut-line shifting during GP and cell sliding during detailed placement. We further use the conjugate gradient method with dynamic step-size control to speed up the GP and macro shifting to find better macro positions. Experimental results show that our placer obtains very high-quality results. © 2008 IEEE. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-45849140142&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/341025 |
ISSN: | 02780070 | DOI: | 10.1109/TCAD.2008.923063 | SDG/Keyword: | Conjugate gradient method; Analytical Placement; Density constraints; Gaussian smoothing; Legalization (LG); Physical design; Placement; Smoothing techniques; Step-size controls; Placers |
Appears in Collections: | 電子工程學研究所 |
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