Configurable Control Barrier Logic Units for Reconfigurable Processor Synchronization
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Solution Overview
Problem
Reconfigurable processors face challenges in efficiently managing control signaling among processing units, particularly in coarse-grain reconfigurable architectures, where synchronization of data processing operations across distributed units is necessary for optimal performance.
Innovation Solution
A control barrier network is introduced, comprising a configurable control bus and multiple control barrier logic units that register and process tokens and status signals, enabling flexible signal routing and synchronization among processing units, allowing for efficient coordination of execution fragments across an array of reconfigurable units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control barrier network with configurable control bus and multiple control barrier logic units is introduced, then synchronization and coordination of data processing operations is enhanced, but device complexity increases
Solution Approach 1:
The control barrier network is segmented into multiple control barrier logic units (CBLUs) distributed across the reconfigurable processing array. Each CBLU independently manages control signals for specific processing elements, dividing the complex control function into manageable modular units that can be configured and routed independently through the control bus.
Solution Approach 2:
The control barrier logic units are designed as universal, reconfigurable components that can handle multiple control functions including barrier synchronization, token passing, and status signal aggregation. The configurable control bus and CBLUs can be programmed to implement different control flow patterns, making the system adaptable to various data processing operations without requiring dedicated control hardware for each function.
2Productivity
If control barrier logic units register and process tokens and status signals from multiple sources, then coordination efficiency is improved, but the complexity of control signaling management increases
Solution Approach 1:
Control barrier logic units serve as intermediary components between processing elements and the control bus. They aggregate status signals from multiple processing units, process tokens according to configured rules, and generate control signals that coordinate downstream operations. This intermediary layer simplifies the overall control signal routing by providing a standardized interface between processing elements and the reconfigurable control network.
Solution Approach 2:
The control barrier network is configured in advance with specific routing patterns and barrier logic rules before execution. Configuration data pre-establishes which processing elements are synchronized by which barriers, how tokens flow through the network, and what combinations of status signals trigger control actions. This preliminary configuration reduces runtime complexity by eliminating the need for dynamic control signal negotiation during execution.
3Adaptability or versatility
If the control bus is made configurable to form dynamic signal routes, then adaptability to complex data processing operations is improved, but device complexity increases
Solution Approach 1:
The control bus incorporates configurable switching elements that can dynamically establish different signal routes based on the executed program's control flow requirements. The routing configuration is determined by program instructions and can change between execution fragments, allowing the same physical bus to adapt to different control barrier topologies and signal flow patterns without requiring dedicated control paths for each possible configuration.
Solution Approach 2:
The configurable control bus changes its operational parameters (routing connections, active signal paths, barrier logic behavior) based on configuration data loaded from program instructions. By modifying the routing parameters and control logic configuration rather than the physical hardware structure, the system achieves high adaptability to different data processing operations while maintaining a relatively simple underlying bus architecture.
Data Source
AI summary
A logic unit in an array of processing units is configurable to consume source tokens and a status signal and to produce barrier tokens and an enable signal based on the source tokens and the status signal.