Routing Congestion in VLSI Circuits: Estimation and Optimization

With the dramatic increases in on-chip packing densities, routing congestion has become a major problem in chip design. The problem is especially acute as interconnects are also the performance bottleneck in integrated circuits. The solution lies in judic

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Series on Integrated Circuits and Systems Series Editor:

Anantha Chandrakasan Massachusetts Institute of Technology Cambridge, Massachusetts

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Prashant Saxena Rupesh S. Shelar Sachin S. Sapatnekar

Routing Congestion in VLSI Circuits Estimation and Optimization

Prashant Saxena Synopsys, Inc. Hillsboro, OR, USA Rupesh S. Shelar Intel Corporation Hillsboro, OR, USA Sachin S. Sapatnekar University of Minnesota Minneapolis, MN, USA Routing Congestion in VLSI Circuits: Estimation and Optimization Library of Congress Control Number: 2006939848 ISBN 978-0-387-30037-5 ISBN 0-387-30037-6

e-ISBN 978-0-387-48550-8 e-ISBN 0-387-48550-3

Printed on acid-free paper. c 2007 Springer Science+Business Media, LLC  All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, LLC, 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now know or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. Printed in the United States of America. 9 8 7 6 5 4 3 2 1 springer.com

To my parents Kailash and Savitri, and my wife Priti. – Prashant To my mother Keshar and siblings Sandhya and Tushar, and the memories of my father. – Rupesh To my family. – Sachin

Preface

With dramatic increases in on-chip packing densities, routing congestion has become a major problem in integrated circuit design, impacting convergence, performance, and yield, and complicating the synthesis of critical interconnects. The problem is