DMA Write Ordering for Overlapping Memory Data Shifts
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Solution Overview
Problem
Existing data shifting methods within memory face issues of data corruption when source and destination areas overlap, and these methods unnecessarily consume additional bandwidth by storing data in a separate memory device.
Innovation Solution
A method and system that utilizes a DMA controller to determine the priority of data items based on their source and destination addresses, generating sequential write requests to prevent data corruption by ensuring data items are stored in the correct order, even when source and destination areas overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is shifted within memory using conventional methods, then data corruption occurs when source and destination areas overlap, but using a separate memory device consumes additional bandwidth
Solution Approach 1:
The patent segments the data shifting operation into multiple priority levels. Data items are divided into different priority groups based on their source and destination addresses, allowing the system to handle overlapping regions systematically. High-priority data items are processed first to ensure data integrity, while lower-priority items are handled subsequently, eliminating the need for separate memory devices and reducing bandwidth consumption.
Solution Approach 2:
The patent changes the parameter of data item ordering by introducing priority levels based on address overlap analysis. By dynamically adjusting the processing order of data items according to their priority (determined by source and destination address relationships), the system prevents data corruption in overlapping regions while maintaining efficient bandwidth utilization within the same memory device.
2Productivity
If data items are processed in arbitrary order during memory shifting, then processing speed may be high, but data corruption occurs in overlapping regions
Solution Approach 1:
The patent applies preliminary action by analyzing source and destination addresses before the actual data shifting operation. The system determines the priority of each data item in advance based on address overlap analysis, creating a prioritized processing list. This preliminary prioritization ensures that when data shifting occurs, high-priority items are processed first, preventing data corruption while maintaining efficient processing speed.
Solution Approach 2:
The patent implements feedback by continuously monitoring the relationship between source and destination addresses during data shifting. The system uses address information to dynamically adjust processing priorities, ensuring that data items are handled in the correct sequence. This feedback mechanism maintains both high processing speed and data integrity by adapting the processing order to the specific memory configuration.
3Reliability
If sequential write requests are generated for all data items, then data integrity is maintained, but processing time increases
Solution Approach 1:
The patent applies partial action by generating sequential write requests only for data items that require them based on priority analysis. Instead of sequentially processing all data items regardless of their characteristics, the system identifies high-priority items (those in overlapping regions) and applies sequential write request generation only to these critical items. Low-priority items can be processed more efficiently without strict sequencing, reducing overall processing time while maintaining data integrity where it matters most.
Data Source
AI summary
Provided is a method for shifting data within a memory, which is performed by a direct memory access (DMA) controller, and which includes receiving a task associated with an operation of shifting target data stored in a first area of a memory connected to the DMA controller to a second area of the memory, receiving the target data from the memory, determining a priority of each of a plurality of data items divided from the target data based on an address of the first area and an address of the second area, generating a plurality of write requests corresponding to the plurality of data items, and transmitting the plurality of generated write requests sequentially to a memory controller associated with the memory, so that the plurality of data items are stored in the second area in sequence according to the determined priority.