DMA Control Module for Peripheral Data Transfer
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Solution Overview
Problem
Current data communication systems between host devices and peripheral devices, such as SD cards, often interrupt non-memory processes, leading to inefficiencies and suboptimal processing bandwidth due to the need for continuous CPU intervention in managing data transfers.
Innovation Solution
A host device with a DMA control module that handles packet header communications without interrupting the host control module, allowing for faster I/O transactions and enabling the CPU to enter a sleep state while the DMA interacts with peripheral cards, waking up only when necessary to handle completed packet headers or issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the host control module continuously monitors and manages data transfers between host and peripheral devices, then data transfer reliability is maintained, but processing bandwidth is reduced and non-memory processes are interrupted
Solution Approach 1:
The data transfer management function is segmented into two parts: the host control module handles high-level data transfer management and non-memory processes, while the DMA control module handles low-level data movement and packet header verification. This segmentation allows the host control module to maintain reliability through proper protocol handling while the DMA module ensures continuous data flow without interrupting the host, thus resolving the contradiction between reliability and productivity.
Solution Approach 2:
The DMA control module acts as an intermediary between the host control module and peripheral devices. It receives data from peripheral devices, verifies packet headers against expected sequences, and transfers data to the host control module without requiring continuous host intervention. This intermediary role enables reliable data transfer while freeing the host control module to execute non-memory processes, thereby improving processing bandwidth.
2Measurement precision
If the CPU actively manages each data transfer operation, then transfer accuracy is ensured, but the CPU cannot enter sleep state and energy consumption increases
Solution Approach 1:
The expected packet header sequence is prepared in advance and stored in the host control module's memory before data transfer begins. The DMA control module uses this pre-prepared sequence to verify incoming packet headers autonomously. This preliminary action ensures transfer accuracy through proper sequence verification while allowing the CPU to enter sleep state during data transfer, reducing energy consumption.
Solution Approach 2:
The DMA control module performs self-service by autonomously verifying packet headers against the expected sequence and managing data transfer without requiring continuous CPU intervention. It independently handles data movement from peripheral devices to the host control module, ensuring transfer accuracy while enabling the CPU to sleep, thus reducing energy consumption.
3Reliability
If the host control module handles all packet header verifications, then protocol compliance is maintained, but latency increases due to continuous CPU intervention
Solution Approach 1:
The packet header verification function is extracted from the host control module and assigned to the DMA control module. The DMA module compares incoming packet headers against the expected sequence independently, maintaining protocol compliance. This extraction eliminates the need for continuous host intervention during data transfer, significantly reducing latency while preserving protocol verification accuracy.
Solution Approach 2:
The DMA control module performs partial verification by checking only the packet header sequence against expected values, while the host control module handles complete protocol processing. This partial action approach maintains sufficient protocol compliance for data transfer while minimizing host involvement, thereby reducing latency without compromising essential protocol requirements.
Data Source
AI summary
A method for operating a host device includes comparing a predetermined response of a peripheral device to a response token received from the peripheral device. The predetermined response and the response token are generated based on a first command transmitted from the host device to the peripheral device. The method further includes controlling a transfer of first data from a first memory to a peripheral control module based on the comparison between the predetermined response and the response token without interrupting a host control module, and selectively passing interrupts to the host control module when the predetermined response does not match the response token.