Improving Detailed Routability and Pin Access with 3D Monolithic Standard Cells

Daohang Shi, A. Davoodi
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引用次数: 8

Abstract

We study the impact of using 3D monolithic (3DM) standard cells on improving detailed routability and pin access. We propose a design flow which transforms standard rows of single-tier "2D" cells into rows of standard 3DM cells folded into two tiers. The transformation preserves layout characteristics such as overall area and number of metal layers for signal routing (i.e., M2 and above). It also creates redundant pins and free routing tracks in the two tiers used by the 3DM cells. We then propose an Integer Linear Program which routes as many nets as possible on the free 3DM routing tracks, leaving the rest of the nets to be routed via a standard global and detailed router on the metal layers dedicated for signal routing. Our experiments show significant improvement in detailed routability metrics using 3DM cells compared to using 2D standard cells.
用3D单片标准单元改进详细的可达性和引脚访问
我们研究了使用3D单片(3DM)标准单元对改善详细路由可达性和引脚访问的影响。我们提出了一种设计流程,将标准的单层“2D”单元转换为折叠成两层的标准3DM单元。该转换保留了布局特征,例如用于信号路由的总体面积和金属层数量(即M2及以上)。它还在3DM单元使用的两层中创建冗余引脚和自由路由轨道。然后,我们提出了一个整数线性方案,在免费的3DM路由轨道上路由尽可能多的网络,剩下的网络通过专用于信号路由的金属层上的标准全局和详细路由器进行路由。我们的实验表明,与使用2D标准单元相比,使用3DM单元的详细可达性指标有显著改善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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