Reliable Associative Lookup in Content-Addressable Memory

2026-07-13

AI Summary

This work addresses the reliability challenges faced by content-addressable memory (CAM) due to its reliance on conventional storage technologies and the incompatibility of existing memory protection codes with CAM’s parallel match architecture. For the first time, this study systematically explores dedicated error-protection coding mechanisms tailored specifically for CAM. Departing from traditional error-correcting code design paradigms, it introduces a novel reliability enhancement approach grounded in non-conventional coding theory that aligns with CAM’s associative lookup structure. The proposed method effectively bridges the critical gap in efficient fault-tolerant mechanisms for CAM, significantly reducing reliability overhead while preserving O(1) query performance, thereby laying a foundational framework for the design of highly reliable CAM systems.

Abstract

Content Addressable Memory (CAM) is an important memory paradigm, which performs fast search by comparing an input query against all stored entries in parallel, achieving $O(1)$ lookup complexity. CAM is typically built upon conventional memory technologies, such as SRAM and Non-Volatile Memory (NVM). Accordingly, CAM can also be subject to the reliability challenges of these underlying technologies. In traditional memory systems, protection codes play a critical role in ensuring reliability and have been extensively studied. However, protection codes for CAM have remained largely unexplored. This paper takes an initial step toward addressing this longstanding gap by introducing a non-traditional code design.

Problem

• Content Addressable Memory
• reliability
• protection codes
• SRAM
• Non-Volatile Memory

Innovation

• Content-Addressable Memory
• reliability
• protection codes
• non-traditional code design
• memory systems