Research on Logic Synthesis and Hardware Description Language Considering Layout Design

传统逻辑综合技术的主要目的是生成逻辑电路的拓扑信息，实现功能描述给出的功能。最终出现在掩模图案中的几何信息是在布局综合阶段独立于逻辑综合阶段确定的。因此，在控制路径等随机电路的情况下，有可能获得比手工设计更好的性能。但是，对于像数据路径这样的规则电路，很难设计出一种好的综合方法，在逻辑综合中考虑布局的几何限制，并为此设计一种描述语言。(a)表征布图模式规律性的设计描述语言研究：提出了一种能够表征布图模式的规律性以及功能设计中布图和布线信息轮廓的语言。(b)考虑面积和布线延迟的逻辑综合研究：研究了逻辑综合中考虑布线延迟和布线延迟的逻辑综合方法，提出了一种利用交换律的电路综合方法。(c)设计实用电路的方法比较：我们检查了几种合成方法的效果，并将它们应用于微处理器的实际开发。我们具体指出了商业工具和语言上的问题。(d)逻辑综合方法的应用：作为我们方法的一个应用，我们提出了使用软核处理器的硬件/软件协同设计。通过以上研究，我们将独立完成的逻辑综合和布局综合统一起来。在该方法中，设计者在建筑设计中指定布局信息，利用这些信息进行逻辑综合和布局综合。给出了一种新型设计自动化系统的框架及其应用方法。

Traditional logic synthesis technology principally aims at generating topological information of logic circuits, realizing function given by functional description. Geometric information which appears in a final mask-pattern is decided in layout synthesis stage independently from logic synthesis. Therefore, in the case of random circuits like control-path, it is possible to get better performance than manual design. But, in the case of regular circuits like data-path, iti is hard to design good synthesis method in which geometric restriction on layout is considered in logic synthesis, and a design description language for that purpose.(a) Study on design description language that canrepresent regularity of layout-pattern : We proposed a language which can specigy the regularity on layout-pattern and the outline of placement and routing information in functional design.(b) Study on logic synthesis considering areas and wiring delays : We investigated a logic sythesis method considering wiring delays and areas in logic synthesis, and proposed a circuit synthesis method using the commutative law.(c) Comparisons of methods to design the practical circuits : We examined the effect of the several synthesis methods, applying them to practical development of a microprocessor. We concretely point out problems on commercial tools and languages.(d) Applocation of the logic synthesis method : As an application of our method, we propose hardware/software codesign using soft core-processor.Through the above researches, we unified logic synthesis and layout synthesis, which have been done independently. In our method, designers specify information on layout in architecture design, and logic synthesis and layout synthesis are done using its information. We also show a framework of new design automation system and its application method.