IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
An effectiveness-oriented greedy heuristic for padding short paths in ultra-low supply voltage designs
Yan HeJianyi MengZhijian ChenXiaoyan XiangChen Chen
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JOURNALS FREE ACCESS

2018 Volume 15 Issue 3 Pages 20171229

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Abstract

Among prior short paths padding algorithms, greedy heuristic based on the number of short paths had been proven to be area saving and fast. For ultra-low supply multi-voltage designs, however, delay buffers explode due to improper padding locations caused by unconsidered delay variations. To overcome this problem, we propose a new evaluation function “effectiveness” for greedy heuristic, to characterize the benefit of buffer insertion, thereby to optimize the allocation of padding delay and reduce buffer overhead. An improved algorithm to dynamically update slacks during delay assignment stage is also introduced. Experimental results show average area reduction of 91.6% compared to the prior method.

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© 2018 by The Institute of Electronics, Information and Communication Engineers
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