In this paper, we determine the optimal shape function for a bi-directional wire under the Elmore delay model. Given a bi-directional wire of length L, let fx be the width of the wire at position x, 0 x L. Let TDR be the right-to-left delay. Let TDL be the left-toright delay. Let TBD = TDR + TDL be the total weighted delay where 0 and 0 are given
Youxin Gao, D. F. Wong