On-Die SRAM Cache Direct Access Mode Switching
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Solution Overview
Problem
Current cache technologies, such as last level caches, primarily reduce memory access latency by storing data copies, but they do not allow direct access modes that could further enhance performance by enabling clients to explicitly access cache data without relying on backing memory, limiting potential latency reductions.
Innovation Solution
Implementing a technique that allows a portion of the last level cache to be used in a directly accessed manner, where clients can access data stored directly in the cache without a memory copy, and converting between cache and directly accessed modes based on client requests or system conditions, using memory mapping mechanisms to manage access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If cache data is accessed through backing memory, then data access is simplified and memory management is easier, but access latency increases and performance is limited
Solution Approach 1:
The patent implements dynamic access mode switching for cache entries, allowing each entry to be accessed either through the cache directly or through backing memory based on real-time conditions. The cache controller dynamically determines the access path for each memory access request, enabling the system to adapt between low-latency cache access and simplified memory-accessed cache modes without requiring static configuration.
2Adaptability or versatility
If the cache is used exclusively as a cache, then latency reduction is achieved, but direct access capability is lost and versatility is reduced
Solution Approach 1:
The patent enables cache entries to serve multiple functions by supporting dual access modes. Each cache entry can function as a traditional cache entry accessed through the cache controller for latency-critical operations, or as a directly accessible memory-like storage for operations requiring explicit access. This multi-functionality allows the same cache hardware to adapt to different access patterns and performance requirements.
Data Source
AI summary
A technique for operating a cache is disclosed. The technique includes utilizing a first portion of a cache in a directly accessed manner; and utilizing a second portion of the cache as a cache.