【作者】 杨君；

【导师】 周学海；

【作者基本信息】 中国科学技术大学 ， 计算机系统结构， 2006， 博士

【摘要】 专用指令集处理器(ASIP，Application Specific Instruction Set Processor)是一种新型的具有处理器结构的芯片，它为某个或某一类型应用而专门设计。通过权衡速度、功耗、成本、灵活性等多个方面的设计约束，设计者可以定制ASIP达到最好的平衡点，从而适应嵌入式系统的需要。因而ASIP在嵌入式领域具有良好的应用前景。 ASIP设计需要面对多种类型的应用定制最优的体系结构，应用多样性和设计时效性是迫切需要解决的问题。然而，目前ASIP体系结构设计的研究大多在某个局部展开，难以提供一种具有易用性、快速性和可评估性的设计方法和环境。所以，本文在对具体的ASIP设计步骤和现有设计方法学进行分析的基础上，提出一种“描述-搜索-细化”的ASIP体系结构设计流程，研究了设计中体系结构描述、搜索与低功耗优化的问题，并依此实现完整的设计环境原型。主要研究归结为 ① 基于ASIP体系结构描述语言xpADL的软件工具生成技术。使用体系结构描述语言xpADL驱动设计流程，设计和实现了描述语言可执行语义的转化和扩展机制，支持快速的功能性验证和性能估计。 ② 基于基本指令集方法的指令集定制和结构属性设计空间搜索技术。定制指令集时利用性能、能耗、面积等多指标归一化模型评估指令集扩展的效果，并采用低功耗状态编码的思想进行指令字编码。同时，采用自动生成的软件工具对由流水线、功能部件、存储部件等构成的结构属性设计空间进行搜索，得到最优的ASIP体系结构。 ③ 结合ASIP体系结构特征，以应用特征为指导，针对指令集(程序代码)、流水线和存储部件进行了低功耗优化研究。 ④ 在上述研究的基础上，实现了一个支持“描述-搜索-细化”设计流程的ASIP体系结构设计环境原型A~2IDE，并基于此平台定义了采用ARM、PISA和Vcore等体系结构的实验型ASIP，验证了A~2IDE的有效性。 本论文做出的贡献主要体现在： (1)在深入分析已有的电子系统设计方法学的基础上，实现了“描述-搜更多还原

【Abstract】 ASIP (Application Specific Instruction Processor) is a kind of special processor designed for specific applications. Making tradeoffs between speed, cost, power consumption and flexibility, the designers customize ASIP to meet the demand of many design goals. So ASIP is becoming more and more popular in embedded applications.When ASIP is used in embedded systems, the variance of applications and TTM (Time-to-Market) of the design poses challenges for ASIP designers. However, recent researches focus on some local factors of ASIP design. Most of them lack an easy-to-use, fast design method and evaluation environment. In this thesis, propose a "describe-explore-refine" design flow after analyzing existing design methodology. And then implement a prototype version of the design environment using our ASIP design method. The research mainly include(1) Software automatic generation based on architecture description language (ADL, Architecture Description Language). Use xpADL to drive multiple design tasks. The transformation and extension of execution semantics of xpADL can speedup the functional verification and performance evaluation.(2) Instruction customization and structure design space exploration base on basic instruction set method. Instruction set extension is evaluated by multi-objective unification evaluation model which uses performance, power, area, and code size as parameters. Encode instruction word based on low power state encoding. Meanwhile, adopt automatically generated tools to explore ASIP architecture design space, and obtain an optimal architecture.(3) Combining with features of ASIP architecture, study on application specific low power optimization technology focusing on instruction set (program code), pipeline and storage.(4) Build a "describe-explore-refine" design environment prototype system, A~2IDE. A~2IDE define multiple architecture instances (ARM, PISA, Vcore) as experimental ASIP. Verify the validity of the A~2IDE.Main contributions of this paper include:(1)After in-depth analysis of the design methodologies of electronic systems, propose a "describe-explore-refine" design flow. This design method uses更多还原