A 45nm CMOS 13-Port 64-Word 41b Fully Associative Content-Addressable Register File

📋 论文概要

本文提出了一种用于移动CPU的45nm CMOS 13端口64字41位全相联内容可寻址寄存器文件，通过寄存器重命名技术解决数据冒险，提高指令并行度。该设计采用全相联CAM结构，支持3个写端口，实现了高性能低功耗的寄存器文件。

💡 主要创新点

• 采用全相联内容可寻址（CAM）结构实现寄存器文件，支持快速查找和数据冒险消除。
• 设计了13端口（3写端口）的多端口寄存器文件，满足双发射乱序超标量处理器需求。
• 在45nm CMOS工艺下实现了低功耗、高吞吐率的寄存器文件设计。

🏷 关键词

📄 原文摘要

The high-performance needs of mobile products has motivated CPU designers to increase processing performance while decreasing power consumption. A dual-issue out-of-order superscalar ARMv7-architecture CPU uses the technique of register-renaming to resolve write-after-read and write-after-write data hazards associated with register file (RF) operands. Register-renaming increases processing throughput by increasing instruction parallelism through the avoidance of many hazard-induced pipeline stalls. The RF is a 64-word, 41-bit fullyassociative content-addressable array with three CAM-write ports, four RAMwrite ports, and six read ports. The RF incorporates many low-power circuit and micro-architectural techniques unseen in prior similar RFs [1,2], such as gatedxnor static comparators, tri-state floating read bitlines, and read wordline gating to prevent unnecessary RF reads. The RF (Fig. 15.7.1) stores 32 architected Logical General Purpose Registers

👥 作者与机构

Greg Burda, Yesh Kolla, Jim Dieffenderfer, Fadi Hamdan

Qualcomm, Raleigh, NC