Butterfly Network Data Alignment for Real-Time Stream Processing
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Solution Overview
Problem
Modern digital signal processors face challenges such as increasing workloads, memory bandwidth limitations, and scheduling issues, particularly when operating on real-time data streams.
Innovation Solution
A digital data processor with a streaming engine that retrieves a sequence of data elements from memory and processes them using data processing functional units, utilizing a multilayer butterfly network for data transformations and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multilayer butterfly network is used for data transformation and alignment, then data processing capability is improved, but device complexity increases due to multiple multiplexors and control circuits
Solution Approach 1:
The patent pre-calculates control signals for the butterfly network multiplexors using combinatorial logic circuits. Instead of dynamically generating control signals during operation, the control signals are determined in advance based on input/output port configurations, which simplifies the control circuit complexity while maintaining the data transformation capability
Solution Approach 2:
The butterfly network is divided into multiple layers, each handling specific data transformation tasks. This segmentation allows independent optimization of each layer's control logic and enables parallel processing of control signal generation across different layers, reducing overall system complexity
2Speed
If memory bandwidth is increased to handle growing workloads, then processing speed is improved, but system cost and complexity increase
Solution Approach 1:
The patent introduces a streaming engine that operates in parallel with the main processing units, creating an additional dimension for data flow. This streaming path handles data movement independently, allowing the memory system to service multiple requests simultaneously without increasing peak bandwidth requirements for any single path
3Adaptability or versatility
If the number of multiplexor control signals is increased to support more data transformations, then adaptability is improved, but control circuit complexity increases
Solution Approach 1:
The butterfly network multiplexors are designed with universal control logic that can handle multiple data transformation types using the same hardware structure. By using pre-calculated control signals based on port configuration rather than dedicated control lines for each transformation type, the system achieves versatility without proportional increases in control circuit complexity
Data Source
AI summary
A system, method, and device are shown that are operable to transform and align a plurality of fields from an input to an output data stream using a multilayer butterfly or inverse butterfly network by selectably switching bit positions of the input data stream. In some examples, a device includes a first circuit configured to selectably switch bit positions of a first subset of the data stream with a second subset of the data stream and a second circuit configured to: selectably switch bit positions of a first subset of the first subset of the data stream with a second subset of the first subset of the data stream, and selectably switch bit positions of a first subset of the second subset of the data stream with a second subset of the second subset of the data stream.