Cache Replacement Module for Low Latency Allocation
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Solution Overview
Problem
Memory accesses in computing devices are impaired by latency, which is exacerbated by cache misses, leading to inefficiencies in data retrieval from external memory.
Innovation Solution
A memory element with a plurality of way memory elements and a replacement module that enables selective output of data bits and tag information, where the least recently used way is identified and replaced in the same clock cycle during a cache miss, minimizing signal paths and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional cache allocation is used, then cache structure is simple, but allocation latency increases and performance deteriorates
Solution Approach 1:
The patent performs preliminary actions by pre-computing replacement candidates and preparing allocation paths before actual allocation occurs. The replacement module identifies candidate ways in advance, and the allocation path is pre-established through the way memory elements and replacement module structure, enabling faster allocation execution without increasing operational complexity
Solution Approach 2:
The replacement module serves as an intermediary component between the address generation unit and the way memory elements. It mediates the allocation process by receiving allocation requests, identifying replacement candidates, and selecting optimal replacement ways, thereby reducing allocation latency without requiring complex changes to the overall cache structure
2Productivity
If way memory elements are enabled for selective output, then allocation efficiency improves, but power consumption increases
Solution Approach 1:
The patent applies local quality by enabling selective output of data bits only from specific way memory elements based on the allocation request. Instead of activating all way memory elements uniformly, the replacement module identifies and enables only the necessary ways (e.g., least recently used ways) for the current allocation operation, improving efficiency while controlling power consumption through localized activation
Solution Approach 2:
The way memory elements operate dynamically with configurable enable/disable states. The replacement module dynamically controls which way memory elements are active based on real-time allocation needs, allowing the system to adjust its state from static full-activation to dynamic selective-activation, thereby optimizing the trade-off between allocation efficiency and power consumption
3Length of moving object
If replacement module enables selective output, then signal paths are minimized, but control complexity increases
Solution Approach 1:
The replacement module segments the control function by dividing the way memory elements into independently controllable units. Each way can be selectively enabled or disabled based on the allocation request, allowing the system to minimize signal paths by activating only necessary segments rather than requiring complex global control of all way memory elements
Data Source
AI summary
Apparatus for memory elements and related methods for performing an allocate operation are provided. An exemplary memory element includes a plurality of way memory elements and a replacement module coupled to the plurality of way memory elements. Each way memory element is configured to selectively output data bits maintained at an input address. The replacement module is configured to enable output of the data bits maintained at the input address of a way memory element of the plurality of way memory elements for replacement in response to an allocate instruction including the input address.