Graphical Latch Slack Visualization for EDA Placement
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Solution Overview
Problem
Current Electronic Design Automation (EDA) tools, such as EinsTimer, struggle to effectively visualize and balance slack differences in latches during placement driven synthesis optimization, as textual reports lack placement information and two-dimensional graphs fail to depict design optimizations, making it difficult to identify and optimize latches with unbalanced slack.
Innovation Solution
A method and system that generate graphical images to identify latches with unbalanced slack by measuring slack differences and coloring them based on severity, allowing for visualization of both the placement and optimization effects within the chip design, using a placement driven synthesis module, graphical system, and graphics API to create images concurrently with optimization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a textual report is generated to identify latches with unbalanced slack, then the latch identification is provided, but the placement information and visual context are missing
Solution Approach 1:
The patent transitions from one-dimensional textual reports to two-dimensional graphical displays that show latch placement locations on the chip. This dimensional enhancement provides both the identification information and spatial context simultaneously, allowing designers to see where latches with unbalanced slack are located on the physical chip layout.
Solution Approach 2:
The patent introduces an intermediary graphical display system that bridges the gap between textual latch identification and physical chip layout. This intermediary visual interface maps latch identifiers to their spatial positions, providing contextual information without requiring separate textual reports or manual cross-referencing.
2Illumination intensity
If a two-dimensional histogram graph is generated to show modified skews, then the slack distribution is visualized, but the design layout and placement context are not depicted
Solution Approach 1:
The patent merges the slack visualization data with the physical chip layout display. Instead of showing separate histogram graphs and layout diagrams, the system combines them into a unified graphical display where latch icons are placed at their actual chip locations and colored according to their slack values, providing both visual intensity information and spatial context simultaneously.
Solution Approach 2:
The patent applies different visual properties (colors, icons, markers) to different regions of the chip layout based on local latch characteristics. Each latch location is individually styled according to its specific slack condition, allowing designers to quickly identify problem areas while maintaining awareness of the overall chip architecture.
3Productivity
If optimizations are performed to balance slack by replacing latches or logic cones, then the netlist is modified, but the visual impact of optimizations is not shown
Solution Approach 1:
The patent implements a feedback mechanism where the graphical display is updated in real-time or near-real-time as optimizations are performed. Designers can immediately see the impact of latch replacements or logic cone modifications on slack balancing, allowing for iterative optimization with visual confirmation of improvement without requiring separate analysis steps.
Solution Approach 2:
The patent transforms the static graphical display into a dynamic visualization that updates as optimizations progress. The display can show before-and-after states, highlight modified latches, and animate changes to help designers understand the evolution of slack balancing during the optimization process.
4Ease of operation
If an interactive physical design browser is used to identify latches, then the current netlist state is depicted, but substantial runtime is required to load the design and compare before and after optimizations
Solution Approach 1:
The patent performs preliminary actions by pre-calculating and storing latch slack information and placement data in a format ready for rapid graphical display. This preparation allows the system to generate visualizations quickly without requiring lengthy design loading or real-time computation during the analysis phase, reducing the time designers spend waiting for results.
Data Source
AI summary
A method for identifying latches in physical designs with unbalanced slack, comprising: creating a netlist describing a logical design, the logical design having a plurality of latches therein; performing a placement of the logical design to obtain a physical design; measuring a slack difference of each of the plurality of latches; selecting a color for each of the plurality of latches based on the slack difference correspondingly measured for each of the plurality of latches; and generating a graphical image identifying each one of the plurality of latches with slack difference in color, the color selected for each one of the plurality of latches with slack difference being indicative of the severity of the slack difference.