Automated Netlist Loop Pipelining for Clock Frequency
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Solution Overview
Problem
Existing circuit design netlists often contain slow sequential loops that limit maximum clock frequency, requiring complex manual transformations and expertise to optimize, and prior approaches fail to effectively pipeline loops without breaking their sequence.
Innovation Solution
A method that associates loop optimization methods with loop patterns in a computer memory, allowing a processor to identify and modify netlist loops to conform to these patterns, thereby optimizing loop structures and increasing clock frequency through automated pipeline analysis and compiler directives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If registers are inserted in feed-forward paths to pipeline logic, then maximum clock frequency is improved, but this approach cannot be applied to sequential loops without breaking their functionality
Solution Approach 1:
The patent segments the sequential loop into multiple pipeline stages by strategically inserting registers at specific break points within the loop. This segmentation allows the loop to be divided into manageable sections that can operate in parallel pipelines, improving clock frequency while preserving the overall loop functionality through coordinated register timing.
Solution Approach 2:
The patent introduces dynamic control mechanisms including enable signals and timing control logic that adaptively manage the pipelined loop operations. These dynamic elements allow the circuit to maintain correct sequential behavior while operating at higher clock frequencies by controlling when data flows through different pipeline stages.
2Speed
If manual loop analysis and transformation is performed to optimize sequential loops, then clock frequency can be improved, but designer time and expertise requirements increase significantly
Solution Approach 1:
The patent implements automated detection and transformation algorithms that autonomously analyze sequential loops in the netlist and apply appropriate pipelining transformations without requiring manual designer intervention. The system automatically identifies loop structures, determines optimal pipeline insertion points, and generates the transformed netlist, eliminating the need for extensive manual analysis while achieving optimal clock frequency improvements.
3Speed
If complex transformations are applied to sequential loops to improve performance, then clock frequency increases, but the transformation complexity and implementation difficulty increase
Solution Approach 1:
The patent applies localized transformation rules that target specific loop patterns with predetermined optimization strategies. Instead of applying complex global transformations, the system identifies local loop structures and applies appropriate pipelining techniques only where needed, reducing overall transformation complexity while achieving frequency improvements at critical loop locations.
Solution Approach 2:
The patent transforms loop optimization from a complex structural modification problem into a parameter-based problem by characterizing loops using specific parameters (loop depth, critical path length, register insertion points) and selecting transformations based on these parameters. This parameterized approach simplifies the transformation process by providing a systematic method for determining optimal modifications without requiring complex manual analysis.
Data Source
AI summary
Disclosed approaches for optimizing netlist loops include associating loop optimization methods with loop patterns in a computer memory. A circuit design can be synthesized into a netlist, and netlist loops that conform to the loop patterns can be identified. For each matching netlist loop, a loop optimization method associated with the loop pattern to which the netlist loop conforms can be selected. For each netlist loop, the loop optimization method associated with the loop pattern to which the netlist loop conforms can be performed to modify logic of the netlist loop in the netlist.