Data Transfer Controller Parallel Arbitration
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Solution Overview
Problem
Previous data transfer controller designs are heavily coupled to external memory, limiting flexibility and scalability, and lack concurrent transfer capabilities, making them inefficient for handling multiple peripherals and memory interchanges.
Innovation Solution
A uniformly pipelined data transfer controller with a hub and multiple identical ports that supports concurrent transfers across multiple channels, each with independent queue management and arbitration, allowing for flexible interchanging of peripherals and memory without affecting the controller's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If previous data transfer controller designs are used with hub and ports architecture, then basic data transfer functionality is provided, but flexibility and scalability are limited due to heavy coupling with external memory
Solution Approach 1:
The data transfer controller is segmented into independent functional units: a channel controller that receives and prioritizes transfer requests, multiple independent transfer controllers that execute transfers, and a hub that routes data. This segmentation decouples the memory interface from the transfer control logic, allowing flexible reconfiguration and interchange of peripherals and memory without affecting the core controller operation.
Solution Approach 2:
The hub unit serves multiple functions: it acts as a central routing point for data between ports, provides address calculation for both source and destination, and enables arbitrary interconnection of peripherals and memory. This universal hub architecture replaces the specialized memory-coupled design, allowing the same controller to efficiently handle various peripheral-interchange scenarios without redesign.
2Productivity
If previous data transfer controller designs are used, then single-channel transfer control is achieved, but concurrent transfer capabilities are lacking, making them inefficient for handling multiple peripherals
Solution Approach 1:
The controller is divided into N independent transfer controllers, each capable of executing data transfers autonomously under the coordination of the channel controller. This segmentation enables concurrent execution of multiple transfers across different ports simultaneously, dramatically improving throughput for systems with multiple peripherals without creating a single point of contention.
Solution Approach 2:
The architecture transitions from a single-channel sequential transfer model to a multi-dimensional parallel transfer model. The channel controller manages N independent transfer channels that can operate simultaneously, adding a temporal parallelism dimension to the transfer architecture. This allows the system to handle multiple peripheral communications concurrently rather than sequentially.
3Adaptability or versatility
If uniformly pipelined architecture with multiple identical ports is implemented, then concurrent transfers and flexibility are improved, but device complexity increases
Solution Approach 1:
All M ports in the hub are designed to be identical in structure and function, each with the same interface characteristics and capabilities. This homogeneity allows peripherals and memory to be freely interchanged between any ports without requiring port-specific configuration or compatibility considerations, greatly enhancing system flexibility and ease of reconfiguration.
Solution Approach 2:
The hub unit provides universal address calculation and routing capabilities that work identically regardless of which ports are involved in the transfer. This universal functionality allows any port to serve as source or destination for any other port, enabling arbitrary peripheral-interchange scenarios without affecting controller operation or requiring specialized handling.
4Productivity
If multiple transfer controllers operate in parallel, then concurrent transfer capability is improved, but control and coordination complexity increases
Solution Approach 1:
The channel controller serves as an intermediary between the external interface and the N independent transfer controllers. It receives transfer requests, prioritizes them according to channel priority levels, and distributes them to appropriate transfer controllers. This intermediary coordination mechanism simplifies the control of parallel transfers by providing a centralized arbitration point rather than requiring complex peer-to-peer coordination between transfer controllers.
Solution Approach 2:
The channel controller performs preliminary prioritization and routing of transfer requests before they reach the independent transfer controllers. By pre-establishing the execution order and target assignment for each transfer request, the system avoids the need for complex runtime coordination between parallel transfer controllers, reducing control complexity while maintaining high parallel throughput.
Data Source
AI summary
A data transfer control apparatus includes a channel controller and plural transfer controllers. The channel controller receives, prioritizes and queues data transfer requests. An event to transfer controller table enables recall of a transfer controller number corresponding to the data transfer request. The plural transfer controllers are independent and can operate simultaneously in parallel. Each transfer controller includes a read bus interface and a write bus interface which arbitrate with other bus masters in the case of blocking accesses directed to interfering devices or address ranges.