Dynamic Cache Verification Without Pre-Loading Delays
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Solution Overview
Problem
Existing cache verification methods are limited by system restrictions and require complex pre-loading of cache memories, leading to delays and reduced test case complexity, making it difficult to handle diverse cache scenarios and corner cases.
Innovation Solution
A method for dynamically modifying cache memory on-the-fly to provide pre-defined read-out results, allowing for early and comprehensive cache verification without pre-loading, by monitoring cache accesses and adjusting cache content, state, and memory reference models to ensure only testable scenarios are covered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cache memory is pre-loaded with all addresses to ensure complete verification coverage, then verification completeness is improved, but system complexity and time consumption increase significantly
Solution Approach 1:
The cache memory is dynamically modified during the verification process based on actual access patterns. Instead of static pre-loading, the system monitors cache accesses in real-time and modifies the cache memory on-the-fly to provide pre-defined read-out results, enabling adaptive verification that responds to actual system behavior
Solution Approach 2:
The system performs preliminary setup by establishing monitoring mechanisms and pre-defining possible read-out results before verification begins. The cache memory is prepared with modification capabilities that allow rapid insertion of test data when specific access patterns are detected, combining advance preparation with runtime adaptability
2Adaptability or versatility
If random addresses are accessed during cache verification, then test case diversity is improved, but cache hit rate decreases leading to verification delays
Solution Approach 1:
The system implements feedback by monitoring cache accesses and using this information to dynamically modify cache content. When random accesses are detected, the system responds by inserting appropriate test data into the cache, creating a closed-loop verification process that adapts to actual access patterns and maintains high hit rates throughout verification
Solution Approach 2:
The cache verification system serves itself by automatically monitoring its own access patterns and performing self-modification to ensure verification coverage. The system autonomously detects when test data needs to be inserted and performs the insertion without external intervention, enabling continuous adaptive verification
3Productivity
If cache memory is dynamically modified on-the-fly to provide pre-defined read-out results, then verification efficiency is improved, but system control complexity increases
Solution Approach 1:
The patent introduces an intermediary layer between the cache memory and the verification process. This intermediary mechanism monitors accesses and coordinates modifications, acting as a mediator that simplifies the control interface while enabling complex dynamic behavior. The intermediary handles the complexity of coordination between monitoring and modification operations
Data Source
AI summary
The present disclosure relates to a computer implemented method for verification of a cache memory of a device under test. The method comprises executing a cache verification process configured for accessing via an interface and verifying the cache memory of the device under test. Cache accesses to the cache memory of the device under test by the cache verification process via the interface are monitored. A cache access by the cache verification process via the interface is detected. In response to the detecting of the cache access a target of the detected cache access is determined and the cache memory is modified for providing a pre-defined cache read-out result for the detected cache access. Via the interface the pre-defined cache read-out result is returned to the cache verification process in response to the detected cache access.