Evolution of NULL Convention Logic Based Asynchronous Paradigm: An Overview and Outlook
Evolution of NULL Convention Logic Based Asynchronous Paradigm: An Overview and Outlook
复制标题
基于NULL约定逻辑的异步范式的演变：概述与展望
DOI：
10.1109/access.2022.3194028
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Ashiq A. Sakib
中科院分区：
文献类型：
--
作者：
Danylo Khodosevych;Ashiq A. Sakib
同步设计范式主导着当今的半导体工业。然而，这种时钟方法面临着当今高速、低功耗设计期望的主要挑战，使用具有不断增加的物理层可变性的工艺。在高频率的设计中，一些与时钟相关的问题浮出水面，这使得时钟管理越来越困难。准延迟不敏感（QDI）异步（无时钟）设计已被证明可以有效地绕过与时钟设计相关的主要限制因素。NULL约定逻辑（NCL）就是这样一种QDI异步设计范例，它将自己作为传统同步电路的一种有前途的替代方案，并且由于其低功耗、健壮的架构和易于设计重用而已经找到了许多商业应用。本文介绍了过去二十年来基于NCL的异步范式的演变，主要集中在NCL设计自动化方面的现有基础研究，涵盖了NCL的综合、优化、测试和验证。对这些方法进行了系统的分析，确定了它们的局限性和未来的研究方向。
The synchronous design paradigm dominates today’s semiconductor industry. However, this clocked approach is facing major challenges with today’s high-speed, low-power design expectations, using processes with ever-increasing physical level variability. Several clock related issues surface in designs operating at higher frequencies, which make clock management increasingly difficult. Quasi-delay insensitive (QDI) asynchronous (clockless) designs have proved to be effective in circumventing the major limiting factors associated with the clocked designs. NULL Convention Logic (NCL) is one such QDI asynchronous design paradigm, which presents itself as a promising alternative to conventional synchronous circuits and has already found numerous commercial applications due to its low power, robust architecture, and ease of design reuse. This paper presents the evolution of NCL based asynchronous paradigm over the past two decades, primarily focusing on existing fundamental research in NCL design automation, spanning over NCL synthesis, optimization, testing, and verification. The methods are systematically analyzed to determine their limitations and future research directions.