Embedded Controller DMA Interface for Host Memory Access
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Solution Overview
Problem
Current communication methods between embedded controllers and hosts are slow and inefficient, requiring significant processing load and wait time due to the need for sequential message exchange for memory operations.
Innovation Solution
Implementing a direct memory access (DMA) system that includes an interface capable of translating relative memory addresses into specific addresses within discontinuous regions of the embedded controller's memory, allowing for read-only, write-only, or read/write access, and providing memory protection, while also enabling automatic address determination for subsequent DMA requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential message exchange is used for memory access, then communication between host and embedded controller is achieved, but processing load and wait time increase significantly
Solution Approach 1:
The patent introduces a DMA controller as an intermediary component that mediates between the host and embedded controller memory. This mediator handles the memory access operations independently, allowing the host to initiate transfers without waiting for sequential responses, thereby reducing wait time and improving communication efficiency.
Solution Approach 2:
The DMA controller enables the memory access system to serve itself by automatically managing the data transfer process. Once a DMA request is initiated, the controller autonomously handles the memory read/write operations without requiring continuous host intervention or processing, thus reducing the host's processing load and wait time.
2Productivity
If sequential message exchange is used for memory access, then communication between host and embedded controller is achieved, but processing load on host increases
Solution Approach 1:
The DMA controller acts as an intermediary that takes over the processing burden of memory access operations from the host. It manages the complex tasks of address translation, data transfer coordination, and error handling, thereby reducing the host's processing load while maintaining efficient communication.
Solution Approach 2:
The DMA system enables self-service processing where the memory access operations are handled autonomously by the DMA controller and embedded controller, eliminating the need for the host to continuously monitor and process each memory transaction, thus significantly reducing the host's processing load.
3Productivity
If sequential message exchange is used for memory access, then communication between host and embedded controller is achieved, but processing load on embedded controller increases
Solution Approach 1:
The DMA controller serves as an intermediary that offloads memory access processing from the embedded controller's main processor. It handles the DMA request coordination and data transfer management, allowing the embedded controller to focus on its primary functions while maintaining efficient communication with the host.
Solution Approach 2:
The DMA mechanism enables the embedded controller's memory subsystem to serve itself by autonomously handling data transfer operations. The memory controller independently manages the DMA transactions without requiring extensive intervention from the main processor, thereby reducing the processor's processing load while maintaining communication efficiency.
4Adaptability or versatility
If relative memory addresses are translated to discontinuous regions, then memory access flexibility is improved, but address translation complexity increases
Solution Approach 1:
The patent segments the memory space into multiple discontinuous regions with different access permissions. This segmentation allows flexible memory access patterns where different regions can be accessed according to their specific characteristics (read-only, write-only, read-write), improving adaptability while managing complexity through structured organization.
Solution Approach 2:
The DMA controller acts as an intermediary that handles the address translation process from relative addresses to specific discontinuous memory regions. This mediator manages the complexity of address mapping and region selection, providing flexible memory access without exposing the complexity of the translation mechanism to the host or user.
Data Source
AI summary
An embedded controller capable of providing direct memory access (DMA) to memory for a host. The controller may include a processor, a memory medium, and an interface coupled to the memory medium. The interface may be configured to couple to a host and receive a DMA request. The DMA request may include a request to read data from a memory location in the memory medium or a request to write data to a memory location in the memory medium. The DMA request may include a relative memory address. The interface may be configured to translate the relative memory address into a first address of the memory medium. Accordingly, the interface may perform operations according to the DMA request using the first address of the memory medium. The processor may be configured to operate according to data stored in the memory medium.