扩展开放核心协议以支持系统级缓存一致性

K. Aisopos, Chien-Chun Chou, L. Peh
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引用次数: 8

摘要

开放核心协议(OCP)是一个标准的片上核心接口规范。当前的版本是灵活的和可配置的,以支持广泛的知识产权核心的通信需求,现在被广泛使用。然而,它不支持系统级的一致性。本文总结了OCP- ip缓存一致性工作组在将缓存一致性扩展纳入OCP方面所做的努力,预计这将对MPSoC行业产生重大影响。在本文中,我们提出了一个向后兼容的连贯开放核心协议接口,并讨论了所引入的设计挑战和影响。这个接口是灵活的,可以支持一系列的一致性协议和方案:我们展示了它如何指定一个基于snoopy总线的方案以及一个基于目录的方案。通过探索两种基本相干方案的整个状态空间,利用NuSMV验证了规范和模型的正确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Extending open core protocol to support system-level cache coherence
Open Core Protocol (OCP) is a standard on-chip core interface specification. The current release is flexible and configurable to support the communication needs of a wide range of Intellectual Property cores, and is now in widespread use. However, it does not support system-level coherence. This paper summarizes an effort within the OCP-IP cache coherence working group on incorporating cache coherence extensions into OCP, which is expected to have strong impact on the MPSoC industry. In this paper, we propose a backward-compatible coherent Open Core Protocol interface and discuss the design challenges and implications introduced. This interface is flexible and can support a range of coherence protocols and schemes: we show how it can specify a snoopy bus-based scheme as well as a directory-based scheme. The correctness of the specification and models was verified using NuSMV, via exploring the entire state space for the two basic coherence schemes.
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