Non-blocking Texture Cache Retry Buffer for In-order Completion
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Solution Overview
Problem
Texture mapping systems using out-of-order completion processes face issues during alpha blending and multi-texturing processes, requiring in-order completion to maintain stability and performance, while existing non-blocking caches may introduce overhead and constraints.
Innovation Solution
A non-blocking texture cache memory is designed with a retry buffer, lookup unit, verification unit, and output control unit to handle cache hits and misses efficiently, dividing the pipeline into hit and miss processes to ensure in-order completion without stalling, using a retry buffer to store and output result data and a cache miss processing unit to collect data from external memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If out-of-order completion process is used in texture mapping, then processing speed is improved, but stability deteriorates during alpha blending and multi-texturing processes
Solution Approach 1:
The texture cache memory is divided into multiple independent pipelines (first pipeline for cache hits, second pipeline for cache misses). Each pipeline processes texture requests independently, allowing out-of-order completion within each pipeline while maintaining overall system stability through structured separation of processing paths.
2Reliability
If in-order completion process is used, then stability is improved, but processing speed deteriorates due to sequential processing requirements
Solution Approach 1:
The system dynamically selects between in-order and out-of-order processing based on the pipeline type. The first pipeline (cache hits) uses out-of-order completion for speed, while the second pipeline (cache misses) uses in-order completion for stability. This dynamic adaptation allows the system to optimize for both speed and stability in different contexts.
3Productivity
If non-blocking cache is used, then productivity is improved, but device complexity increases due to retry buffer and verification mechanisms
Solution Approach 1:
The non-blocking cache is segmented into multiple pipelines with dedicated retry buffers and verification units for each. This segmentation allows the complexity to be distributed and managed independently, where each pipeline handles specific cache scenarios (hits or misses) with appropriate retry mechanisms, improving overall productivity without overwhelming complexity.
4Reliability
If retry operations are implemented in texture cache, then reliability is improved, but performance degradation occurs due to additional processing overhead
Solution Approach 1:
The verification unit checks whether texture data is already present in the retry buffer before initiating retry operations. This preliminary check prevents unnecessary retry processing, thereby maintaining reliability by ensuring data correctness while avoiding performance degradation from redundant operations. The system performs the verification action in advance to optimize the retry process.
Data Source
AI summary
A non-blocking texture cache memory for a texture mapping pipeline and an operation method of the non-blocking texture cache memory may include: a retry buffer configured to temporarily store result data according to a hit pipeline or a miss pipeline; a retry buffer lookup unit configured to look up the retry buffer in response to a texture request transferred from a processor; a verification unit configured to verify whether result data corresponding to the texture request is stored in the retry buffer as the lookup result; and an output control unit configured to output the stored result data to the processor when the result data corresponding to the texture request is stored as the verification result.