Physical Implementation of the Eight-Core Godson-3B Microprocessor

• Published in: Journal of computer science and technology Vol. 26; no. 3; pp. 520 - 527
• Main Author: 王茹 范宝峡 杨梁 高燕萍 刘动 肖斌 王江嵋 张译夫 王宏 胡伟武
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.05.2011; Springer Nature B.V; Graduate School of Chinese Academy of Sciences, Beijing 100049, China; Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China; Loongson Technologies Corporation Limited, Beijing 100190, China%Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China; Loongson Technologies Corporation Limited, Beijing 100190, China%Loongson Technologies Corporation Limited, Beijing 100190, China
• Subjects: Architecture; Artificial Intelligence; Bandwidths; Central processing units; Clocks; Computer Science; CPUs; CPU核心; Data Structures and Information Theory; Design; Designers; Gating and risering; Information Systems Applications (incl.Internet); International; Mathematical analysis; Microprocessors; Multiprocessing; Power; Power consumption; Power management; Regular Paper; Science; Servers; Software Engineering; Studies; Synchronous; Theory of Computation; Transistors; 微处理器; 时钟网络; 曙光服务器; 物理实现; 设计流量; 高性能服务器; 龙芯; GALS; low power; clock mesh; hierarchical design flow; physical implementation
• ISSN: 1000-9000; 1860-4749
• DOI: 10.1007/s11390-011-1151-6

The Godson-3B processor is a powerful processor designed for high performance servers including Dawning Servers. It offers significantly improved performance over previous Godson-3 series CPUs by incorporating eight CPU cores and vector computing units. It contains 582.6 M transistors within 300 mm2 area in 65 nm technology and is implemented in parallel with full hierarchical design flows. In Godson-3B, advanced clock distribution mechanisms including GALS （Globally Asynchronous Locally Synchronous） and clock mesh are adopted to obtain an OCV tolerable clock network. Custom-designed de-skew modules are also implemented to afford further latency balance after fabrication. The power reduction of Godson- 3B is maintained by MLMM （Multi Level Multi Mode） clock gating and multi-threshold-voltage cells substitution schemes. The highest frequency of Godson-3B is 1.05 GHz and the peak performance is 128 GFlops （double-precision） or 256 GFlops （single-precision） with 40 W power consumption.