Circuit Timing Tradeoff Using Slack-Based Area and Power Thresholds
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Solution Overview
Problem
Existing EDA systems face challenges in optimizing resistor-transfer logic (RTL) synthesis by balancing improvements in power, timing, and area, often sacrificing one aspect to enhance another, leading to inefficient circuit design.
Innovation Solution
A timing-aware tradeoff model is employed to dynamically set thresholds for area and power sacrifice based on local timing information, prioritizing transforms that improve constrained timing areas while minimizing unnecessary area or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a transform is applied to improve timing of the circuit design, then timing is improved, but area or power consumption increases
Solution Approach 1:
The system applies transforms selectively to specific logic paths based on their timing characteristics. By analyzing local timing information and applying transforms only where needed rather than uniformly across the entire circuit, the system improves timing performance while minimizing unnecessary area consumption.
Solution Approach 2:
The system dynamically adjusts transform selection based on timing parameters such as slack values. By changing the parameters used to evaluate transforms (e.g., using timing-aware metrics instead of static criteria), the system optimizes the balance between timing improvement and area overhead.
2Loss of time
If a transform is applied to improve timing of the circuit design, then timing is improved, but power consumption increases
Solution Approach 1:
The system evaluates transforms based on local timing information specific to each logic path and applies them only where timing improvement is needed. This selective application avoids unnecessary power consumption in regions of the circuit that do not require timing optimization.
Solution Approach 2:
The system applies transforms partially - only to the extent necessary to meet timing requirements. By avoiding excessive transformation of logic paths that already have adequate timing margins, the system prevents unnecessary power consumption while still achieving required timing performance.
3Reliability
If multiple transforms are evaluated to optimize circuit design, then design quality is improved, but system complexity increases
Solution Approach 1:
The system segments the circuit design into individual logic paths and evaluates transforms for each path separately based on its specific timing characteristics. This segmentation allows the system to manage complexity by handling smaller, localized decisions rather than evaluating all possible transforms across the entire circuit simultaneously.
Solution Approach 2:
The system performs preliminary analysis of timing information for each logic path before evaluating transforms. By pre-processing and organizing timing data, the system simplifies the subsequent transform evaluation process and reduces the computational complexity of selecting optimal transforms.
Data Source
AI summary
Various embodiments provide for modifying a circuit design based on timing tradeoff, which can be part of an electronic design automation (EDA) system. For instance, some embodiments use a return on investment (ROI) concept to determine one or more thresholds for how much area or power of a circuit design should be available for use (e.g., sacrificed) in order to obtain an improvement in slack by a given transformation.


