Configurable Cache IP with Flushable Address Range
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Solution Overview
Problem
Existing cache systems require manual, time-consuming software intervention to flush cache lines containing data structures, which hinders system performance and increases memory access latency.
Innovation Solution
A cache IP system with a set of service registers, including a control register, allows automatic flushing of cache lines within a specified address range, enabling system software to manage coherence and reduce memory access latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual software intervention is used to flush cache lines, then cache coherence can be maintained, but system performance deteriorates and memory access latency increases
Solution Approach 1:
The cache IP is equipped with service registers that enable it to automatically perform flush operations without requiring external software intervention. The cache maintenance unit monitors and manages cache coherence autonomously by receiving flush commands and executing the necessary cache line invalidations, thereby freeing the processing element from manual cache management tasks while maintaining coherence reliability
Solution Approach 2:
A cache maintenance unit acts as an intermediary between the processing element and the cache memory system. This unit receives flush commands from software, identifies the relevant cache lines within specified address ranges, and automatically performs the flush operations. This intermediary mechanism bridges the gap between software control requirements and hardware-level cache management, improving performance by offloading the actual flush execution from the processing element
2Reliability
If manual software flushing is implemented, then cache lines can be updated in memory, but time is consumed from the processing element
Solution Approach 1:
The cache IP autonomously manages the flush operation execution through its integrated maintenance unit. When a flush command is issued with a specified address range, the cache maintenance unit automatically identifies affected cache lines, determines which ones contain dirty data, and performs the memory update operations without requiring the processing element to remain engaged, thus minimizing time loss while ensuring accurate memory updates
Solution Approach 2:
The system performs preliminary identification of cache lines that require flushing before the actual flush operation begins. The cache maintenance unit pre-processes the flush command to determine the set of cache lines within the specified address range that contain modified data, preparing the flush operation in advance. This preliminary action allows the processing element to initiate the flush without being blocked during the actual memory write operations, reducing overall time loss
3Productivity
If cache buffering is used to reduce memory access latency, then system performance improves, but the complexity of managing cache coherence increases
Solution Approach 1:
The cache IP includes an integrated maintenance unit that autonomously handles coherence management tasks. This unit monitors cache state, tracks dirty lines, and automatically executes flush operations when commanded, without requiring complex external coherence protocols or software intervention. The self-service capability reduces the complexity burden on external systems while maintaining the performance benefits of cache buffering
Solution Approach 2:
The cache maintenance unit serves as an intermediary layer that simplifies coherence management for the processing element. It absorbs the complexity of coherence protocol implementation, address range analysis, and cache line identification, presenting a simple flush command interface to software while handling all the complex coherence management tasks internally, thus improving performance without exposing complexity to external systems
Data Source
AI summary
A system and method are disclosed for a cache IP that includes registers that are programmed through a service port. Service registers are selected from the registers to define an address range so that all cache lines within the address range can be flushed automatically using a control signal sent to a control register.