Completion Flag for Memory Access Latency
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Solution Overview
Problem
Current memory systems face inefficiencies in determining the completion of access operations due to high signaling overhead and latency caused by polling status registers, especially when multiple memory devices share a common bus, which limits parallelism and increases power consumption.
Innovation Solution
The implementation of a completion flag system, where a single bit indicates the completion of access operations across multiple memory devices, allowing for concurrent polling and reduced signaling overhead, enabling more efficient communication and operation parallelism even when devices share a common bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If status registers are polled to determine completion of access operations, then operation completion can be detected, but signaling overhead increases and latency increases
Solution Approach 1:
The patent extracts the completion status information from the full status register by introducing a separate completion flag. This flag is a single bit that indicates whether any access operation has completed on the memory device, allowing the controller to quickly determine completion without reading the entire status register contents.
Solution Approach 2:
The completion flag acts as an intermediary between the memory device and the controller. Instead of directly polling the full status register, the controller first checks this intermediate flag to determine if completion has occurred, reducing the signaling overhead and latency associated with full status register polling.
2Reliability
If status registers are polled to determine completion of access operations, then operation completion can be detected, but power consumption increases
Solution Approach 1:
The patent extracts only the necessary completion information from the status register by using a dedicated completion flag. This single bit contains the essential information about operation completion, eliminating the need to power and process the entire status register during polling operations.
Solution Approach 2:
Instead of polling the complete status register (excessive action), the system polls only the completion flag (partial action) to determine if operations have completed. This partial polling approach reduces power consumption while still providing the necessary completion detection functionality.
3Adaptability or versatility
If multiple memory devices share a common bus, then device density increases, but parallelism is limited and signaling overhead increases
Solution Approach 1:
The patent merges the completion status indication into a shared completion flag that can be accessed by multiple controllers through the common bus. This allows multiple memory devices to share the bus while maintaining efficient completion detection through the unified flag mechanism, enabling parallel polling operations.
Solution Approach 2:
The completion flag serves multiple functions: it indicates completion status for memory operations, enables efficient polling across multiple devices, and reduces signaling overhead on the shared bus. This multi-functional design allows the same flag to be used by multiple controllers without requiring separate status register polling for each device.
Data Source
AI summary
Methods, systems, and devices for using a completion flag for memory operations are described. A completion flag for a memory device may indicate whether at least one access operation has been completed at the memory device. A controller may poll the completion flag, and if the completion flag indicates that at least one access operation has been completed at the memory device, the controller may poll a status register for the memory device to obtain additional information regarding one or more completed access operations at the memory device.