Flexible Escape Routing in a Generalized Hexagonal Array for Flip-Chip Designs

• Main Authors: Chia-Her Kuo, 郭嘉和
• Other Authors: Jin-Tai Yan
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/07659392281727695621

碩士 === 中華大學 === 資訊工程學系(所) === 95 === The I/O count in a single chip has continuously been growing as the systems become more complicated. Flip-Chip design has been introduced to provide an efficient solution for chip/package interconnections to accommodate the increasing demand of high I/O count. In this paper, based on the properties of hexagonal array for flip-chip designs, a generalized hexagonal array , called α-hexagonal array, is proposed to increase the I/O density and reduce the area cost on total routing area. The experimental result show that the proposedα-hexagonal array can improve 20% area cost for multiple-layer escape routing compared with the square-grid array and 8.6% area cost for multiple-layer escape routing compared with the standard hexagonal array. Furthermore, based on the angle assignment for the optimal number of wires through any horizontal channel in aα-hexagonal array, an efficient column-by-column escape routing strategy is proposed for proposedα-hexagonal array. Besides that, two-sided horizontal/vertical escape routing in aα-hexagonal array is also developed from the concept of column-by-column escape routing.