Superconductor Standard Cell Library for Advanced EDA Design
Superconductor Standard Cell Library for Advanced EDA Design
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用于高级 EDA 设计的超导标准单元库
DOI：
10.1109/tasc.2021.3061024
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发表时间：
2021
影响因子：
1.8
通讯作者：
A. Inamdar
中科院分区：
文献类型：
--
作者：
S. S. Meher;J. Ravi;M. E. Çelik;Stephen Miller;A. Sahu;A. Talalaevskii;A. Inamdar
单元库是采用先进的电子设计自动化（EDA）工具（如逻辑综合和自动布局布线）的关键组件。EDA工具对于按数量级缩放电路复杂性至关重要。我们已经为MIT-LL SFQ 5ee工艺设计了一个双RSFQ/ERSFQ单元库，可以与正在开发的超导体EDA工具套件一起使用。除了满足裕度标准之外，每个单元的性能已经针对多个工艺角上的蒙特-卡罗统计变化进行了优化，包括最小化定时分布的扩展。为了实现数字设计流程，使用HDL仿真与时序回注释自由文件已开发用于多个工艺角，使用负载相关的时序characterization。这些单元的设计标准高度为40 μm，网格尺寸为20 μm。该库为信号和电源布线提供专用轨道。RSFQ设计支持多个独立偏置。电池可以通过邻接或使用无源传输线互连。已经提供了跨单元均匀分布的专用壕沟槽。所有单元在布局后重新优化。该图书馆目前包含22种独特类型的细胞。通过为MIT-LL SFQ 5ee制造工艺设计RSFQ和ERSFQ移位寄存器来进行单元库的初始验证，该工艺产生了宽的操作裕度。此外，我们目前的测量结果的芯片设计和制造的多路复用方案来表征几个库细胞。
Cell library is the keystone component that enables adoption of advanced electronic design automation (EDA) tools, such as logic synthesis and automatic place-and-route. The EDA tools are essential for scaling circuit complexity by orders of magnitude. We have designed a dual RSFQ/ERSFQ cell library for the MIT-LL SFQ5ee process, that can be used with the superconductor EDA tools suite that is being developed. In addition to satisfying the margins criterion, the performance of each cell has been optimized for Monte-Carlo statistical variations across multiple process corners including minimizing the spread of timing distributions. To enable a digital design flow using HDL simulations with timing back-annotation Liberty files have been developed for multiple process corners, using the load-dependent timing char-acterization. The cells have been designed for a standard height of 40 μm with a grid size of 20 μm. The library provides dedicated tracks for signal and power routing. Multiple independent biases are supported for RSFQ designs. The cells can be interconnected either by abutting or using passive transmission lines. Dedicated moat slots have been provided which are uniformly distributed across the cell. All cells are re-optimized post-layout. The library currently contains 22 unique types of cells. Initial validation of the cell library was performed by designing RSFQ and ERSFQ shift registers for the MIT-LL SFQ5ee fabrication process, which yielded wide operating margins. In addition, we present measurement results for a chip designed and fabricated to characterize several library cells using a multiplexing scheme.