By Topic

A delay budgeting algorithm ensuring maximum flexibility in placement

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Sarrafzadeh, M. ; Dept. of Electr. & Comput. Eng., Northwestern Univ., Evanston, IL, USA ; Knol, D.A. ; Tellez, G.E.

In this paper, we present a new, general approach to the problem of computing upper bounds on net delays. The upper bounds on net delays are computed so that timing constraints between input and output signals are satisfied. The set of delay upper bounds is called a delay budget. The objective of this work is to compute a delay budget that will lead to timing feasible circuit placement and routing. In our formulation, we find a delay budget so that the placement phase has “maximum flexibility.” We formulate this problem as a convex programming problem and prove that it has a special structure. We utilize the special structure of the problem to propose an efficient graph-based algorithm. We present experimental results for our algorithms with the MCNC placement benchmarks. Our experiments use budgeting results as net length constraints for the TimberWolf placement program, which we use to evaluate the budgeting algorithms. We obtain an average of 50% reduction in net length constraint violations over the well-known zero-slack algorithm (ZSA). We also study different delay budgeting objective functions, which yield 2× performance improvements without loss of solution quality. Our results and graph-based formulation show that our proposed algorithm is suitable for modern large-scale budgeting problems

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:16 ,  Issue: 11 )