AN 1016: Timing Closure Methodology Quick Reference Guide

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ID 836192
Date 11/15/2024
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Document Table of Contents
Document Table of Contents x
Answers to Top FAQs 1. About This Application Note 2. RTL Analysis and Optimization Techniques 3. Post-Fit Analysis and Optimization Techniques 4. Additional Optimization Techniques 5. Iterative Analysis and Optimization 6. Document Revision History of AN 1016: Timing Closure Methodology Quick Reference Guide
2. RTL Analysis and Optimization Techniques x
2.1. Optimization Before Synthesis 2.2. Optimization After Analysis & Elaboration 2.3. Analysis After Synthesis
2.2. Optimization After Analysis & Elaboration x
2.2.1. Check Design Rules with Design Assistant 2.2.2. Preview the Design in RTL Analyzer
2.3. Analysis After Synthesis x
2.3.1. Reduce Excessive Logic Levels 2.3.2. Evaluate SDC-on-RTL Constraints 2.3.3. Verify Memory Resources 2.3.4. Confirm State Machine Recognition
3. Post-Fit Analysis and Optimization Techniques x
3.1. Define Post-Fit Timing Constraints 3.2. Analyze Post-Fit Timing Analysis Results
3.2. Analyze Post-Fit Timing Analysis Results x
3.2.1. Analyze Post-Fit Timing Reports 3.2.2. Cross-Probe with Design Assistant 3.2.3. Analyze Fitter Reports 3.2.4. Reduce Register-to-Register Delays
3.2.3. Analyze Fitter Reports x
3.2.3.1. Review RAM and DSP Reports 3.2.3.2. View Resource Usage and Congestion Reports
3.2.4. Reduce Register-to-Register Delays x
3.2.4.1. Report Logic Depth 3.2.4.2. Manually Duplicate Logic 3.2.4.3. Optimize Shift Registers
4. Additional Optimization Techniques x
4.1. Use the Fast Forward Compilation Flow 4.2. Apply Compiler Optimization Settings 4.3. Optimize the Design Floorplan 4.4. Run Design Space Explorer II 4.5. Run Exploration Dashboard 4.6. Back-Annotate Assignments
4.1. Use the Fast Forward Compilation Flow x
4.1.1. Facilitate Register Movement
Answers to Top FAQs
1. About This Application Note
2. RTL Analysis and Optimization Techniques
3. Post-Fit Analysis and Optimization Techniques
4. Additional Optimization Techniques
5. Iterative Analysis and Optimization
6. Document Revision History of AN 1016: Timing Closure Methodology Quick Reference Guide

2.3.2. Evaluate SDC-on-RTL Constraints

Running synthesis propagates any SDC-on-RTL constraints to the node netlist. You can evaluate the SDC-on-RTL constraints in the Post-Synthesis Constraints report and the Constraint Propagation Report following successful design synthesis.

The Constraint Propagation Report provides a chronological history of all changes made to each constraint during the compilation flow. This report is continually updated with entries for modified constraints, including reasons for any moves or changes, making this detailed tracking beneficial for troubleshooting if constraints change unexpectedly.

Figure 4. Post-Synthesis Constraints Report


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