DMA Controller Write Position Record for Data Stream Synchronization
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Solution Overview
Problem
In data processing systems, synchronizing the production and consumption of data streams, especially in complex real-time systems using Direct Memory Access (DMA) operations, is inefficient and burdensome, often requiring CPU intervention, which can lead to power consumption and latency issues.
Innovation Solution
A method where the producer processing unit maintains a shared record of its writing position in the data stream, allowing consumer processing units to control their reading operations independently of the CPU, thereby avoiding CPU-based synchronization and reducing the need for additional signal paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CPU-based interrupt service routine is used for synchronization, then data stream synchronization between producer and consumer processing units is achieved, but power consumption increases and latency is introduced
Solution Approach 1:
The patent extracts the synchronization function from the CPU by introducing dedicated synchronization memory and control logic in the DMA controller. The CPU's interrupt service routine is replaced by autonomous DMA controller operations that monitor write positions and control consumer processing units directly, eliminating the need for CPU intervention in synchronization tasks.
Solution Approach 2:
The DMA controller becomes self-sufficient by maintaining its own write position record in synchronization memory and autonomously controlling consumer processing units based on this record. The system serves its own synchronization needs without external CPU assistance, with the DMA controller independently managing data stream coordination between producer and consumer units.
2Reliability
If CPU-based interrupt service routine is used for synchronization, then data stream synchronization is maintained, but system latency increases
Solution Approach 1:
The synchronization function is extracted from the CPU timeline, allowing the DMA controller to operate independently without waiting for CPU interrupt handling. By placing synchronization logic in the DMA controller with dedicated memory, the system eliminates CPU-induced latency and achieves real-time synchronization.
Solution Approach 2:
The DMA controller maintains a write position record in synchronization memory in advance, allowing consumer processing units to proactively check availability and prepare for data consumption. This preliminary positioning and recording eliminates waiting time and enables immediate data transfer when ready.
3Productivity
If traditional DMA synchronization method is used, then data transfer between memory and processing units is efficient, but additional signal paths and system complexity are required
Solution Approach 1:
The patent merges the synchronization control function with the DMA controller by integrating synchronization memory and write position tracking directly into the DMA hardware. This consolidation eliminates the need for separate signal paths between CPU, producer, and consumer units, reducing system complexity while maintaining data transfer efficiency.
Solution Approach 2:
The DMA controller is enhanced with multi-functionality, serving both data transfer and synchronization control roles. By making the DMA controller universal—handling both data movement and coordination—the system reduces the number of dedicated components and signal paths required.
Data Source
AI summary
A producer processing unit of a data processing system that is producing a stream of data for use by one or more consumer processing units of the data processing system maintains a record that is accessible to the consumer processing units of a position in the data stream for which it has written data to memory. The consumer processing units then control their reading of the data stream from the memory in accordance with the write position record maintained by the producer processing unit.