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Paper Abstract and Keywords
Presentation 2015-05-14 09:40
Use of the subgradient method to minimize half perimeter wirelength with consideration of cell overlap in analytical placement
Hiroyuki Iwasaki, Hiroshi Miyashita (The Univ. of Kitakyushu) VLD2015-2
Abstract (in Japanese) (See Japanese page) 
(in English) Placement continues to be one of the most important tasks in electronic design automation (EDA)
to handle the continual increase of integration density and scale of circuits.
Among circuit placement methods researched to date,
analytical placement approach is considered as the most promising one.
It can be
classified into two categories depending on the objective functions used in it.
The former uses quadratic function which corresponds to mechanical energy of net formulated
as spring model. While the latter uses approximated half-perimeter wirelength (HPWL)
by differentiable nonlinear function
such as log-sum-exp function.
Although they have a merit that differentiable objective functions can be efficiently optimized,
the quality of the resultant placement is estimated by total HPWL over all nets.
We already proposed a subgradient method to minimize HPWL directly
without approximating HPWL in circuit placement.
On the basis of it, in this paper, we propose a method to minimize HPWL
on the condition that cell overlap is smaller than given upper bound.
Using Lagrangian relaxation, it can reduce cell overlap
in the framework of the subgradient method.
Finally an experimental result for a small test data also shown.
Keyword (in Japanese) (See Japanese page) 
(in English) placement / analytical placement / half-perimeter wire length / subgradient method / overlap / Lagrangian relaxation / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 21, VLD2015-2, pp. 7-12, May 2015.
Paper # VLD2015-2 
Date of Issue 2015-05-07 (VLD) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF VLD2015-2

Conference Information
Committee VLD IPSJ-SLDM  
Conference Date 2015-05-14 - 2015-05-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Kitakyushu International Conference Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) System Design, etc. 
Paper Information
Registration To VLD 
Conference Code 2015-05-VLD-SLDM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Use of the subgradient method to minimize half perimeter wirelength with consideration of cell overlap in analytical placement 
Sub Title (in English)  
Keyword(1) placement  
Keyword(2) analytical placement  
Keyword(3) half-perimeter wire length  
Keyword(4) subgradient method  
Keyword(5) overlap  
Keyword(6) Lagrangian relaxation  
Keyword(7)  
Keyword(8)  
1st Author's Name Hiroyuki Iwasaki  
1st Author's Affiliation The University of Kitakyushu (The Univ. of Kitakyushu)
2nd Author's Name Hiroshi Miyashita  
2nd Author's Affiliation The University of Kitakyushu (The Univ. of Kitakyushu)
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Speaker Author-1 
Date Time 2015-05-14 09:40:00 
Presentation Time 25 minutes 
Registration for VLD 
Paper # VLD2015-2 
Volume (vol) vol.115 
Number (no) no.21 
Page pp.7-12 
#Pages 6 
Date of Issue 2015-05-07 (VLD) 

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